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annotate packages/kernel/current/src/sync/mutex.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 59d97b6ba612
children 0ec04793409a
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1 //==========================================================================
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2 //
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3 // sync/mutex.cxx
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4 //
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5 // Mutex and condition variable implementation
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): nickg
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35 // Contributors: nickg, jlarmour
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36 // Date: 1999-02-17
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37 // Purpose: Mutex implementation
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38 // Description: This file contains the implementations of the mutex
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39 // and condition variable classes.
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45 #include <pkgconf/kernel.h>
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46
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47 #include <cyg/kernel/ktypes.h> // base kernel types
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48 #include <cyg/infra/cyg_trac.h> // tracing macros
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49 #include <cyg/infra/cyg_ass.h> // assertion macros
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50 #include <cyg/kernel/instrmnt.h> // instrumentation
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51
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52 #include <cyg/kernel/mutex.hxx> // our header
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53
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54 #include <cyg/kernel/thread.inl> // thread inlines
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55 #include <cyg/kernel/sched.inl> // scheduler inlines
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56 #include <cyg/kernel/clock.inl> // clock inlines
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57
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58 // -------------------------------------------------------------------------
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59 // Mutex protocol test macros.
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60 // If the dynamic protocol option is enabled, then these generate appropriate
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61 // tests on the protocol field. If there is no dynamic choice then they simply
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62 // result in empty statements.
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63
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64 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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65
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66 #define IF_PROTOCOL_INHERIT if( protocol == INHERIT )
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67 #define IF_PROTOCOL_CEILING if( protocol == CEILING )
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68
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69 #else
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70
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71 #define IF_PROTOCOL_INHERIT
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72 #define IF_PROTOCOL_CEILING
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73
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74 #endif
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76 // -------------------------------------------------------------------------
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77 // Constructor
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78
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79 Cyg_Mutex::Cyg_Mutex()
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80 {
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81 CYG_REPORT_FUNCTION();
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82
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83 locked = false;
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84 owner = NULL;
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85
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86 #if defined(CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT) && \
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87 defined(CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC)
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88
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89 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_INHERIT
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90 protocol = INHERIT;
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91 #endif
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92 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_CEILING
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93 protocol = CEILING;
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94 ceiling = CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY;
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95 #endif
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96 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_NONE
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97 protocol = NONE;
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98 #endif
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99
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100 #endif
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101
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102 CYG_REPORT_RETURN();
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103 }
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104
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105 // -------------------------------------------------------------------------
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106 // Construct with defined protocol
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107
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108 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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109
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110 Cyg_Mutex::Cyg_Mutex( cyg_protcol protocol_arg )
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111 {
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112 CYG_REPORT_FUNCTION();
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113
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114 locked = false;
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115 owner = NULL;
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116
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117 protocol = protocol_arg;
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118
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119 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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120 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY
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121
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122 // if there is a default priority ceiling defined, use that to initialize
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123 // the ceiling.
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124 ceiling = CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY;
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125
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126 #else
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127
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128 // Otherwise set it to zero.
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129 ceiling = 0;
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130
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131 #endif
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132 #endif
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133
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134 CYG_REPORT_RETURN();
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135 }
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136
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137 #endif
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138
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139 // -------------------------------------------------------------------------
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140 // Destructor
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141
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142 Cyg_Mutex::~Cyg_Mutex()
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143 {
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144 CYG_REPORT_FUNCTION();
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145
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146 CYG_ASSERT( owner == NULL, "Deleting mutex with owner");
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147 CYG_ASSERT( queue.empty(), "Deleting mutex with waiting threads");
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148 CYG_REPORT_RETURN();
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149 }
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150
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151 // -------------------------------------------------------------------------
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152
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153 #ifdef CYGDBG_USE_ASSERTS
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154
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diff changeset
155 cyg_bool
2
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156 Cyg_Mutex::check_this( cyg_assert_class_zeal zeal) const
0
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157 {
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158 // CYG_REPORT_FUNCTION();
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159
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160 // check that we have a non-NULL pointer first
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161 if( this == NULL ) return false;
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162
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163 switch( zeal )
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164 {
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165 case cyg_system_test:
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166 case cyg_extreme:
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167 case cyg_thorough:
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168 case cyg_quick:
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169 case cyg_trivial:
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170 if( locked && owner == NULL ) return false;
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171 if( !locked && owner != NULL ) return false;
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172 case cyg_none:
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173 default:
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174 break;
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175 };
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176
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177 return true;
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178 }
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179
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180 #endif
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181
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182 // -------------------------------------------------------------------------
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183 // Lock and/or wait
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184
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185 cyg_bool
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186 Cyg_Mutex::lock(void)
0
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187 {
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188 CYG_REPORT_FUNCTYPE("returning %d");
0
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189
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190 cyg_bool result = true;
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191 Cyg_Thread *self = Cyg_Thread::self();
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192
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193 // Prevent preemption
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194 Cyg_Scheduler::lock();
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195
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196 CYG_ASSERTCLASS( this, "Bad this pointer");
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197
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198 CYG_INSTRUMENT_MUTEX(LOCK, this, 0);
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199
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200 // Loop while the mutex is locked, sleeping each time around
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201 // the loop. This copes with the possibility of a higher priority
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202 // thread grabbing the mutex between the wakeup in unlock() and
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203 // this thread actually starting.
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204
115
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205 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
62
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206
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207 self->count_mutex();
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208
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209 #endif
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210
2
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211 while( locked && result )
0
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212 {
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213 CYG_ASSERT( self != owner, "Locking mutex I already own");
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214
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215 self->set_sleep_reason( Cyg_Thread::WAIT );
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216
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217 self->sleep();
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218
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219 queue.enqueue( self );
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220
115
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221 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
0
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222
115
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223 IF_PROTOCOL_INHERIT
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224 owner->inherit_priority(self);
28
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225
0
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226 #endif
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227
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228 CYG_INSTRUMENT_MUTEX(WAIT, this, 0);
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229
115
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230 // Allow other threads to run
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231 Cyg_Scheduler::reschedule();
0
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232
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233 CYG_ASSERTCLASS( this, "Bad this pointer");
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234
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235 switch( self->get_wake_reason() )
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236 {
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237 case Cyg_Thread::DESTRUCT:
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238 case Cyg_Thread::BREAK:
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239 result = false;
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240 break;
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241
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242 case Cyg_Thread::EXIT:
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243 self->exit();
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244 break;
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245
3111d98ba7b3 Initial commit of eCos version 1.1
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246 default:
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247 break;
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248 }
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249
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250 }
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251
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252 if( result )
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253 {
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254 locked = true;
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255 owner = self;
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256
115
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257 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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diff changeset
258
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259 IF_PROTOCOL_CEILING
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260 self->set_priority_ceiling(ceiling);
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261
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262 #endif
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263
0
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264 CYG_INSTRUMENT_MUTEX(LOCKED, this, 0);
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265 }
115
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266 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
62
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diff changeset
267 else
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268 {
115
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diff changeset
269 IF_PROTOCOL_INHERIT
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270 {
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271 self->uncount_mutex();
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272 self->disinherit_priority();
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273 }
62
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274 }
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diff changeset
275 #endif
0
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276
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277 // Unlock the scheduler and maybe switch threads
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278 Cyg_Scheduler::unlock();
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279
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280 CYG_ASSERTCLASS( this, "Bad this pointer");
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281
2
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282 CYG_REPORT_RETVAL(result);
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283
0
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284 return result;
3111d98ba7b3 Initial commit of eCos version 1.1
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285 }
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286
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287 // -------------------------------------------------------------------------
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288 // Try to lock and return success
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289
2
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290 cyg_bool
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291 Cyg_Mutex::trylock(void)
0
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292 {
2
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293 CYG_REPORT_FUNCTYPE("returning %d");
0
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294
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295 CYG_ASSERTCLASS( this, "Bad this pointer");
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296
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297 cyg_bool result = true;
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298
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299 // Prevent preemption
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300 Cyg_Scheduler::lock();
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301
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302 // If the mutex is not locked, grab it
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303 // for ourself. Otherwise return failure.
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304 if( !locked )
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305 {
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306 Cyg_Thread *self = Cyg_Thread::self();
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diff changeset
307
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308 locked = true;
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309 owner = self;
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310
115
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311 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
0
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312
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313 self->count_mutex();
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314
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315 #endif
115
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diff changeset
316 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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diff changeset
317
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318 IF_PROTOCOL_CEILING
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319 self->set_priority_ceiling(ceiling);
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diff changeset
320
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321 #endif
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322
0
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323 }
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324 else result = false;
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325
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326 CYG_INSTRUMENT_MUTEX(TRY, this, result);
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327
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328 // Unlock the scheduler and maybe switch threads
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329 Cyg_Scheduler::unlock();
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330
2
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331 CYG_REPORT_RETVAL(result);
0
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332 return result;
3111d98ba7b3 Initial commit of eCos version 1.1
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333 }
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334
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335 // -------------------------------------------------------------------------
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336 // unlock
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337
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338 void
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339 Cyg_Mutex::unlock(void)
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340 {
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341 CYG_REPORT_FUNCTION();
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342
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343 // Prevent preemption
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344 Cyg_Scheduler::lock();
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345
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346 CYG_INSTRUMENT_MUTEX(UNLOCK, this, 0);
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347
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348 CYG_ASSERTCLASS( this, "Bad this pointer");
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349 CYG_ASSERT( locked, "Unlock mutex that is not locked");
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350 CYG_ASSERT( owner == Cyg_Thread::self(), "Unlock mutex I do not own");
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351
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352 if( !queue.empty() ) {
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353
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354 // The queue is non-empty, so grab the next
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355 // thread from it and wake it up.
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356
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357 Cyg_Thread *thread = queue.dequeue();
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358
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359 CYG_ASSERTCLASS( thread, "Bad thread pointer");
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360
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361 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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362
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363 // Give the owner-to-be a chance to inherit from the remaining
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364 // queue or the relinquishing thread:
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365
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366 IF_PROTOCOL_INHERIT
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367 thread->relay_priority(owner, &queue);
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368
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369 #endif
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370
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371 thread->set_wake_reason( Cyg_Thread::DONE );
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372
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373 thread->wake();
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374
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375 CYG_INSTRUMENT_MUTEX(WAKE, this, thread);
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376
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377 }
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378
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379 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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380
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381 owner->uncount_mutex();
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382
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383 #endif
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384 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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385
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386 IF_PROTOCOL_INHERIT
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387 owner->disinherit_priority();
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388
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389 #endif
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390 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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391
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392 IF_PROTOCOL_CEILING
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393 owner->clear_priority_ceiling();
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394
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395 #endif
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396
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397 locked = false;
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398 owner = NULL;
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399
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400 CYG_ASSERTCLASS( this, "Bad this pointer");
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401
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402 // Unlock the scheduler and maybe switch threads
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403 Cyg_Scheduler::unlock();
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404
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405 CYG_REPORT_RETURN();
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406 }
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407
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408 // -------------------------------------------------------------------------
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409 // Release all waiting threads.
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410
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411 void Cyg_Mutex::release()
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412 {
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413 CYG_REPORT_FUNCTION();
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414
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415 // Prevent preemption
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416 Cyg_Scheduler::lock();
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417
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418 CYG_INSTRUMENT_MUTEX(RELEASE, this, 0);
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419
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420 CYG_ASSERTCLASS( this, "Bad this pointer");
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421
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422 while( !queue.empty() )
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423 {
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424 // The queue is non-empty, so grab each
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425 // thread from it and release it.
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426
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427 Cyg_Thread *thread = queue.dequeue();
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428
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429 CYG_ASSERTCLASS( thread, "Bad thread pointer");
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430
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431 thread->release();
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432
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433 CYG_INSTRUMENT_MUTEX(RELEASED, this, thread);
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434
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435 }
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436
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437 CYG_ASSERTCLASS( this, "Bad this pointer");
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438
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439 // Unlock the scheduler and maybe switch threads
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440 Cyg_Scheduler::unlock();
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441
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442 CYG_REPORT_RETURN();
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443 }
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444
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445 // -------------------------------------------------------------------------
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446 // Set ceiling priority for priority ceiling protocol
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447
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448 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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449
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450 void Cyg_Mutex::set_ceiling( cyg_priority priority )
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451 {
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452 CYG_REPORT_FUNCTION();
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453
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454 // CYG_ASSERT( priority >= CYG_THREAD_MAX_PRIORITY, "Priority out of range");
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455 // CYG_ASSERT( priority <= CYG_THREAD_MIN_PRIORITY, "Priority out of range");
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456
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457 // Prevent preemption
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458 Cyg_Scheduler::lock();
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459
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460 ceiling = priority;
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461
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462 // Unlock the scheduler
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463 Cyg_Scheduler::unlock();
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464
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465 CYG_REPORT_RETURN();
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466 }
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467
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468 #endif
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469
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470 //==========================================================================
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471 // Condition variables
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472
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473 Cyg_Condition_Variable::Cyg_Condition_Variable(
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474 Cyg_Mutex &mx // linked mutex
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475 )
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476 {
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477 CYG_REPORT_FUNCTION();
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478
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479 mutex = &mx;
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480
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481 CYG_ASSERTCLASS( mutex, "Invalid mutex argument");
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482
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483 CYG_REPORT_RETURN();
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484 }
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485
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486 Cyg_Condition_Variable::Cyg_Condition_Variable()
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487 {
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488 CYG_REPORT_FUNCTION();
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489
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490 mutex = NULL;
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491
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492 CYG_REPORT_RETURN();
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493 }
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494
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495 // -------------------------------------------------------------------------
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496 // Destructor
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497
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498 Cyg_Condition_Variable::~Cyg_Condition_Variable()
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499 {
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500 CYG_REPORT_FUNCTION();
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501
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502 CYG_ASSERT( queue.empty(), "Deleting condvar with waiting threads");
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diff changeset
503
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parents: 0
diff changeset
504 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
505 }
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
506
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
507 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
508
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
509 #ifdef CYGDBG_USE_ASSERTS
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
510
78
59d97b6ba612 Merge from eCos master repository on 2000-03-28-19:50:47-BST
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parents: 66
diff changeset
511 cyg_bool
2
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
512 Cyg_Condition_Variable::check_this( cyg_assert_class_zeal zeal) const
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
513 {
2
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
514 bool result = true;
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
515
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
516 CYG_REPORT_FUNCTYPE("returning %d");
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
517 CYG_REPORT_FUNCARG1("zeal = %d", zeal);
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
518
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parents:
diff changeset
519 // check that we have a non-NULL pointer first
2
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
520 if( this == NULL )
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
521 result = false;
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
522 else {
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parents: 0
diff changeset
523
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
524 switch( zeal )
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
525 {
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jlarmour
parents: 0
diff changeset
526 case cyg_system_test:
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
527 case cyg_extreme:
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parents: 0
diff changeset
528 case cyg_thorough:
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
529 if( mutex != NULL && !mutex->check_this(zeal) )
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
530 result = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
531 case cyg_quick:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
532 case cyg_trivial:
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parents: 0
diff changeset
533 case cyg_none:
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parents: 0
diff changeset
534 default:
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jlarmour
parents: 0
diff changeset
535 break;
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jlarmour
parents: 0
diff changeset
536 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
537 }
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
538
2
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parents: 0
diff changeset
539 CYG_REPORT_RETVAL(result);
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
540 return result;
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
541 }
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
542
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
543 #endif
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
544
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
545 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
546 // Wait for condition to be true
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
547 // Note: if this function is entered with the scheduler locked (e.g. to
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
548 // suspend DSR processing) then there is no need to take the lock. Also
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
549 // in this case, exit with the scheduler locked, which allows this function
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
550 // to be used in a totally thread-safe manner.
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
551
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
552 cyg_bool
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parents: 78
diff changeset
553 Cyg_Condition_Variable::wait_inner( Cyg_Mutex *mx )
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
554 {
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
555 CYG_REPORT_FUNCTION();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
556
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jlarmour
parents: 78
diff changeset
557 cyg_bool result = true;
0
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jlarmour
parents:
diff changeset
558 Cyg_Thread *self = Cyg_Thread::self();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
559
2
443894e2e912 Block commit of eCos version 1.2.1
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parents: 0
diff changeset
560 cyg_int32 current_lock = Cyg_Scheduler::get_sched_lock();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
561
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
562 if (current_lock == 0)
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jlarmour
parents: 0
diff changeset
563 // Prevent preemption
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
564 Cyg_Scheduler::lock();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
565
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
566 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
567 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
568 CYG_ASSERTCLASS( self, "Bad self thread");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
569
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
570 CYG_INSTRUMENT_CONDVAR(WAIT, this, 0);
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
571
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
572 mx->unlock();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
573
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
574 self->set_sleep_reason( Cyg_Thread::WAIT );
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
575
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
576 self->sleep();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
577
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
578 queue.enqueue( self );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
579
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
580 CYG_ASSERT( Cyg_Scheduler::get_sched_lock() == 1, "Called with non-zero scheduler lock");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
581
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jlarmour
parents: 78
diff changeset
582 // Avoid calling ASRs during the following unlock.
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jlarmour
parents: 78
diff changeset
583 self->set_asr_inhibit();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
584
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
585 // Unlock the scheduler and switch threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
586 Cyg_Scheduler::unlock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
587
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
588 // Allow ASRs again
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
589 self->clear_asr_inhibit();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
590
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
591 CYG_INSTRUMENT_CONDVAR(WOKE, this, self->get_wake_reason());
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
592
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
593 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
594 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
595
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
596 switch( self->get_wake_reason() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
597 {
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
598 case Cyg_Thread::DESTRUCT: // which, the cv or the mutex?
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
599 case Cyg_Thread::BREAK:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
600 result = false;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
601 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
602
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
603 case Cyg_Thread::EXIT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
604 self->exit();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
605 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
606
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
607 default:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
608 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
609 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
610
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
611 // When we awake, we must re-acquire the mutex. Note that while
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
612 // it is essential to release the mutex and queue on the CV
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
613 // atomically relative to other threads, to avoid races, it is not
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
614 // necessary for us to re-acquire the mutex in the same atomic
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
615 // action. Hence we can do it after unlocking the scheduler.
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
616 // We need to loop here in case the thread is released while waiting
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
617 // for the mutex. It is essential that we exit this function with the
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
618 // mutex claimed.
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
619
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
620 while ( !mx->lock() )
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
621 continue;
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
622
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
623 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
624 CYG_ASSERTCLASS( mx, "Corrupt mutex");
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
625 CYG_ASSERT( mx->owner == self, "Not mutex owner");
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
626
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
627 CYG_REPORT_RETURN();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
628
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
629 if (current_lock)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
630 // Reacquire the DSR pseudo lock
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
631 Cyg_Scheduler::lock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
632
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
633 return result;
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
634 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
635
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
636 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
637 // Wake one thread
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
638
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
639 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
640 Cyg_Condition_Variable::signal(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
641 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
642 CYG_REPORT_FUNCTION();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
643
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
644 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
645
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
646 // Prevent preemption
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
647 Cyg_Scheduler::lock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
648
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
649 CYG_INSTRUMENT_CONDVAR(SIGNAL, this, 0);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
650
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
651 if( !queue.empty() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
652 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
653 // The queue is non-empty, so grab the next
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
654 // thread from it and wake it up.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
655
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
656 Cyg_Thread *thread = queue.dequeue();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
657
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
658 CYG_ASSERTCLASS( thread, "Bad thread pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
659
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
660 thread->set_wake_reason( Cyg_Thread::DONE );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
661
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
662 thread->wake();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
663
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
664 CYG_INSTRUMENT_CONDVAR(WAKE, this, thread);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
665
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
666 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
667
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
668 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
669
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
670 // Unlock the scheduler and maybe switch threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
671 Cyg_Scheduler::unlock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
672
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
673 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
674 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
675
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
676 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
677 // Set cond true, wake all threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
678
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
679 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
680 Cyg_Condition_Variable::broadcast(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
681 {
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
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682 CYG_REPORT_FUNCTION();
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diff changeset
683
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diff changeset
684 CYG_ASSERTCLASS( this, "Bad this pointer");
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parents:
diff changeset
685
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parents:
diff changeset
686 // Prevent preemption
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parents:
diff changeset
687 Cyg_Scheduler::lock();
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parents:
diff changeset
688
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parents:
diff changeset
689 CYG_INSTRUMENT_CONDVAR(BROADCAST, this, 0);
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
690
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parents:
diff changeset
691 // Grab all the threads from the queue and let them
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
692 // go.
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parents:
diff changeset
693
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parents:
diff changeset
694 while( !queue.empty() )
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
695 {
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
696 Cyg_Thread *thread = queue.dequeue();
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
697
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
698 CYG_ASSERTCLASS( thread, "Bad thread pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
699
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diff changeset
700 thread->set_wake_reason( Cyg_Thread::DONE );
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
701
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
702 thread->wake();
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
703
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parents:
diff changeset
704 CYG_INSTRUMENT_CONDVAR(WAKE, this, thread);
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
705 }
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
706
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parents:
diff changeset
707 CYG_ASSERTCLASS( this, "Bad this pointer");
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diff changeset
708
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
709 // Unlock the scheduler and maybe switch threads
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diff changeset
710 Cyg_Scheduler::unlock();
2
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diff changeset
711
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diff changeset
712 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
713 }
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diff changeset
714
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diff changeset
715 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
716 // Optional timed wait on a CV
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717
2
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diff changeset
718 #if defined(CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT)
0
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diff changeset
719
2
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diff changeset
720 cyg_bool
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
721 Cyg_Condition_Variable::wait_inner( Cyg_Mutex *mx, cyg_tick_count timeout )
0
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diff changeset
722 {
2
443894e2e912 Block commit of eCos version 1.2.1
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diff changeset
723 CYG_REPORT_FUNCTYPE("returning %d");
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diff changeset
724 CYG_REPORT_FUNCARG1("timeout = %d", timeout);
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
725
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diff changeset
726 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
727 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
728
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diff changeset
729 cyg_bool result = true;
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
730
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
731 Cyg_Thread *self = Cyg_Thread::self();
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diff changeset
732
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diff changeset
733 CYG_ASSERTCLASS( self, "Bad self thread");
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
734
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parents:
diff changeset
735 // Prevent preemption
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
736 Cyg_Scheduler::lock();
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
737
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
738 CYG_INSTRUMENT_CONDVAR(TIMED_WAIT, this, 0 );
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
739
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
740 mx->unlock();
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
741
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
742 // The ordering of sleep() and set_timer() here are
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
743 // important. If the timeout is in the past, the thread
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
744 // will be woken up immediately and will not sleep.
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
745
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
746 self->sleep();
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
747
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
748 // Set the timer and sleep reason
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
749 self->set_timer( timeout, Cyg_Thread::TIMEOUT );
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
750
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
751 // Only enqueue if the timeout has not already fired.
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
752 if( self->get_wake_reason() == Cyg_Thread::NONE )
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
753 queue.enqueue( self );
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
754
3111d98ba7b3 Initial commit of eCos version 1.1
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diff changeset
755 CYG_ASSERT( Cyg_Scheduler::get_sched_lock() == 1, "Called with non-zero scheduler lock");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
756
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parents: 78
diff changeset
757 // Avoid calling ASRs during the following unlock.
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diff changeset
758 self->set_asr_inhibit();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
759
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
760 // Unlock the scheduler and switch threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
761 Cyg_Scheduler::unlock();
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
762
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
763 // Allow ASRs again
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
764 self->clear_asr_inhibit();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
765
0
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
766 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
767 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
768
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
769 self->clear_timer();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
770
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
771 CYG_INSTRUMENT_CONDVAR(WOKE, this, self->get_wake_reason());
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
772
3111d98ba7b3 Initial commit of eCos version 1.1
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parents:
diff changeset
773 switch( self->get_wake_reason() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
774 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
775 case Cyg_Thread::TIMEOUT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
776 case Cyg_Thread::DESTRUCT: // which, the cv or the mutex?
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
777 case Cyg_Thread::BREAK:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
778 result = false;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
779 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
780
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
781 case Cyg_Thread::EXIT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
782 self->exit();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
783 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
784
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
785 default:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
786 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
787 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
788
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
789
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
790 // When we awake, we must re-acquire the mutex. Note that while
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
791 // it is essential to release the mutex and queue on the CV
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
792 // atomically relative to other threads, to avoid races, it is not
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
793 // necessary for us to re-acquire the mutex in the same atomic
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
794 // action. Hence we can do it after unlocking the scheduler.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
795
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
796 while ( !mx->lock() )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
797 continue;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
798
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
799 CYG_ASSERTCLASS( this, "Bad this pointer");
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 78
diff changeset
800 CYG_ASSERTCLASS( mx, "Corrupt mutex");
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
801
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
802 CYG_REPORT_RETVAL(result);
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
803
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
804 return result;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
805 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
806
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
807 #endif
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
808
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
809
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
810 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
811 // EOF sync/mutex.cxx