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annotate packages/kernel/current/src/sync/mutex.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents f62680ef1804
children d2c90368aeef
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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 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): nickg
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44 // Contributors: nickg, jlarmour
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45 // Date: 1999-02-17
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46 // Purpose: Mutex implementation
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47 // Description: This file contains the implementations of the mutex
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48 // and condition variable classes.
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <pkgconf/kernel.h>
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55
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56 #include <cyg/kernel/ktypes.h> // base kernel types
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57 #include <cyg/infra/cyg_trac.h> // tracing macros
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58 #include <cyg/infra/cyg_ass.h> // assertion macros
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59 #include <cyg/kernel/instrmnt.h> // instrumentation
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60
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61 #include <cyg/kernel/mutex.hxx> // our header
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62
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63 #include <cyg/kernel/thread.inl> // thread inlines
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64 #include <cyg/kernel/sched.inl> // scheduler inlines
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65 #include <cyg/kernel/clock.inl> // clock inlines
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66
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67 // -------------------------------------------------------------------------
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68 // Mutex protocol test macros.
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69 // If the dynamic protocol option is enabled, then these generate appropriate
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70 // tests on the protocol field. If there is no dynamic choice then they simply
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71 // result in empty statements.
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72
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73 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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74
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75 #define IF_PROTOCOL_INHERIT if( protocol == INHERIT )
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76 #define IF_PROTOCOL_CEILING if( protocol == CEILING )
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77 #define IF_PROTOCOL_ACTIVE if( protocol != NONE )
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78
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79 #else
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80
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81 #define IF_PROTOCOL_INHERIT
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82 #define IF_PROTOCOL_CEILING
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83 #define IF_PROTOCOL_ACTIVE
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84
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85 #endif
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86
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87 // -------------------------------------------------------------------------
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88 // Constructor
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89
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90 Cyg_Mutex::Cyg_Mutex()
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91 {
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92 CYG_REPORT_FUNCTION();
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93
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94 locked = false;
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95 owner = NULL;
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96
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97 #if defined(CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT) && \
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98 defined(CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC)
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99
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100 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_INHERIT
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101 protocol = INHERIT;
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102 #endif
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103 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_CEILING
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104 protocol = CEILING;
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105 ceiling = CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY;
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106 #endif
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107 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_NONE
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108 protocol = NONE;
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109 #endif
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110
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111 #else // not (DYNAMIC and DEFAULT defined)
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112
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113 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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114 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY
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115
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116 // if there is a default priority ceiling defined, use that to initialize
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117 // the ceiling.
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118 ceiling = CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY;
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119
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120 #else
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121
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122 // Otherwise set it to zero.
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123 ceiling = 0;
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124
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125 #endif
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126 #endif
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127
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128 #endif // DYNAMIC and DEFAULT defined
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129
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130 CYG_REPORT_RETURN();
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131 }
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132
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133 // -------------------------------------------------------------------------
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134 // Construct with defined protocol
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135
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136 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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137
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138 Cyg_Mutex::Cyg_Mutex( cyg_protcol protocol_arg )
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139 {
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140 CYG_REPORT_FUNCTION();
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141
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142 locked = false;
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143 owner = NULL;
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144
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145 protocol = protocol_arg;
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146
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147 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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148 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY
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149
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150 // if there is a default priority ceiling defined, use that to initialize
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151 // the ceiling.
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152 ceiling = CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY;
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153
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154 #else
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155
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156 // Otherwise set it to zero.
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157 ceiling = 0;
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158
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159 #endif
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160 #endif
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161
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162 CYG_REPORT_RETURN();
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163 }
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164
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165 #endif
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166
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167 // -------------------------------------------------------------------------
0
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168 // Destructor
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169
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170 Cyg_Mutex::~Cyg_Mutex()
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171 {
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172 CYG_REPORT_FUNCTION();
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173
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174 CYG_ASSERT( owner == NULL, "Deleting mutex with owner");
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175 CYG_ASSERT( queue.empty(), "Deleting mutex with waiting threads");
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176 CYG_REPORT_RETURN();
0
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177 }
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178
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179 // -------------------------------------------------------------------------
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180
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181 #ifdef CYGDBG_USE_ASSERTS
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182
78
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183 cyg_bool
2
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184 Cyg_Mutex::check_this( cyg_assert_class_zeal zeal) const
0
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185 {
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186 // CYG_REPORT_FUNCTION();
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187
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188 // check that we have a non-NULL pointer first
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189 if( this == NULL ) return false;
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190
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191 switch( zeal )
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192 {
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193 case cyg_system_test:
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194 case cyg_extreme:
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195 case cyg_thorough:
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196 case cyg_quick:
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197 case cyg_trivial:
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198 if( locked && owner == NULL ) return false;
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199 if( !locked && owner != NULL ) return false;
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200 case cyg_none:
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201 default:
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202 break;
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203 };
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204
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205 return true;
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206 }
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207
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208 #endif
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209
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210 // -------------------------------------------------------------------------
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211 // Lock and/or wait
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212
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213 cyg_bool
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214 Cyg_Mutex::lock(void)
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215 {
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216 CYG_REPORT_FUNCTYPE("returning %d");
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217
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218 cyg_bool result = true;
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219 Cyg_Thread *self = Cyg_Thread::self();
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220
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221 // Prevent preemption
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222 Cyg_Scheduler::lock();
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223
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224 CYG_ASSERTCLASS( this, "Bad this pointer");
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225
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226 CYG_INSTRUMENT_MUTEX(LOCK, this, 0);
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227
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228 // Loop while the mutex is locked, sleeping each time around
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229 // the loop. This copes with the possibility of a higher priority
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230 // thread grabbing the mutex between the wakeup in unlock() and
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231 // this thread actually starting.
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232
115
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233 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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234
208
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235 IF_PROTOCOL_ACTIVE
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236 self->count_mutex();
62
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237
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238 #endif
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239
181
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240 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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241
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242 IF_PROTOCOL_CEILING
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243 self->set_priority_ceiling(ceiling);
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244
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245 #endif
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246
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247 while( locked && result )
0
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248 {
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249 CYG_ASSERT( self != owner, "Locking mutex I already own");
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250
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251 self->set_sleep_reason( Cyg_Thread::WAIT );
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252
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253 self->sleep();
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254
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255 queue.enqueue( self );
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256
115
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257 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
0
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258
115
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259 IF_PROTOCOL_INHERIT
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260 owner->inherit_priority(self);
28
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261
0
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262 #endif
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263
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264 CYG_INSTRUMENT_MUTEX(WAIT, this, 0);
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265
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266 // Allow other threads to run
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267 Cyg_Scheduler::reschedule();
0
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268
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269 CYG_ASSERTCLASS( this, "Bad this pointer");
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270
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271 switch( self->get_wake_reason() )
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272 {
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273 case Cyg_Thread::DESTRUCT:
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274 case Cyg_Thread::BREAK:
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275 result = false;
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276 break;
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277
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278 case Cyg_Thread::EXIT:
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279 self->exit();
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280 break;
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281
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282 default:
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283 break;
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284 }
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285
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286 }
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287
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288 if( result )
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289 {
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290 locked = true;
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291 owner = self;
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292
181
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293 CYG_INSTRUMENT_MUTEX(LOCKED, this, 0);
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294 }
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295 else
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296 {
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297 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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298
208
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299 IF_PROTOCOL_ACTIVE
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300 self->uncount_mutex();
181
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301
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302 #endif
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303 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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304
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305 IF_PROTOCOL_INHERIT
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306 self->disinherit_priority();
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307
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308 #endif
115
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309 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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310
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311 IF_PROTOCOL_CEILING
181
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312 self->clear_priority_ceiling();
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313
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314 #endif
0
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315 }
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316
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317 // Unlock the scheduler and maybe switch threads
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318 Cyg_Scheduler::unlock();
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319
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320 CYG_ASSERTCLASS( this, "Bad this pointer");
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321
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322 CYG_REPORT_RETVAL(result);
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323
0
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324 return result;
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325 }
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326
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327 // -------------------------------------------------------------------------
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328 // Try to lock and return success
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329
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330 cyg_bool
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331 Cyg_Mutex::trylock(void)
0
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332 {
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333 CYG_REPORT_FUNCTYPE("returning %d");
0
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334
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335 CYG_ASSERTCLASS( this, "Bad this pointer");
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336
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337 cyg_bool result = true;
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338
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339 // Prevent preemption
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340 Cyg_Scheduler::lock();
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341
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342 // If the mutex is not locked, grab it
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343 // for ourself. Otherwise return failure.
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344 if( !locked )
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345 {
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346 Cyg_Thread *self = Cyg_Thread::self();
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347
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348 locked = true;
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349 owner = self;
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350
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351 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
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352
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353 IF_PROTOCOL_ACTIVE
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354 self->count_mutex();
0
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355
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356 #endif
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357 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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358
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359 IF_PROTOCOL_CEILING
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360 self->set_priority_ceiling(ceiling);
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361
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362 #endif
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363
0
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364 }
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365 else result = false;
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366
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367 CYG_INSTRUMENT_MUTEX(TRY, this, result);
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368
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369 // Unlock the scheduler and maybe switch threads
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370 Cyg_Scheduler::unlock();
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371
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372 CYG_REPORT_RETVAL(result);
0
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373 return result;
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374 }
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375
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376 // -------------------------------------------------------------------------
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377 // unlock
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378
2
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379 void
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380 Cyg_Mutex::unlock(void)
0
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381 {
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382 CYG_REPORT_FUNCTION();
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383
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384 // Prevent preemption
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385 Cyg_Scheduler::lock();
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386
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387 CYG_INSTRUMENT_MUTEX(UNLOCK, this, 0);
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388
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389 CYG_ASSERTCLASS( this, "Bad this pointer");
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390 CYG_ASSERT( locked, "Unlock mutex that is not locked");
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391 CYG_ASSERT( owner == Cyg_Thread::self(), "Unlock mutex I do not own");
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392
62
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393 if( !queue.empty() ) {
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diff changeset
394
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395 // The queue is non-empty, so grab the next
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diff changeset
396 // thread from it and wake it up.
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diff changeset
397
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398 Cyg_Thread *thread = queue.dequeue();
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diff changeset
399
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400 CYG_ASSERTCLASS( thread, "Bad thread pointer");
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401
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402 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
62
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diff changeset
403
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404 // Give the owner-to-be a chance to inherit from the remaining
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405 // queue or the relinquishing thread:
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diff changeset
406
115
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407 IF_PROTOCOL_INHERIT
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diff changeset
408 thread->relay_priority(owner, &queue);
62
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diff changeset
409
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410 #endif
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411
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412 thread->set_wake_reason( Cyg_Thread::DONE );
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413
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414 thread->wake();
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415
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416 CYG_INSTRUMENT_MUTEX(WAKE, this, thread);
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417
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418 }
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419
115
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420 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL
0
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421
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422 IF_PROTOCOL_ACTIVE
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423 owner->uncount_mutex();
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424
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425 #endif
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426 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_INHERIT
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427
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428 IF_PROTOCOL_INHERIT
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429 owner->disinherit_priority();
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430
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431 #endif
115
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432 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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diff changeset
433
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434 IF_PROTOCOL_CEILING
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435 owner->clear_priority_ceiling();
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436
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437 #endif
0
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438
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439 locked = false;
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440 owner = NULL;
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441
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442 CYG_ASSERTCLASS( this, "Bad this pointer");
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443
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444 // Unlock the scheduler and maybe switch threads
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445 Cyg_Scheduler::unlock();
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446
2
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447 CYG_REPORT_RETURN();
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448 }
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449
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450 // -------------------------------------------------------------------------
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451 // Release all waiting threads.
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diff changeset
452
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diff changeset
453 void Cyg_Mutex::release()
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454 {
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455 CYG_REPORT_FUNCTION();
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diff changeset
456
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diff changeset
457 // Prevent preemption
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diff changeset
458 Cyg_Scheduler::lock();
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diff changeset
459
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460 CYG_INSTRUMENT_MUTEX(RELEASE, this, 0);
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diff changeset
461
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462 CYG_ASSERTCLASS( this, "Bad this pointer");
443894e2e912 Block commit of eCos version 1.2.1
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diff changeset
463
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diff changeset
464 while( !queue.empty() )
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diff changeset
465 {
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diff changeset
466 // The queue is non-empty, so grab each
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diff changeset
467 // thread from it and release it.
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diff changeset
468
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diff changeset
469 Cyg_Thread *thread = queue.dequeue();
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diff changeset
470
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diff changeset
471 CYG_ASSERTCLASS( thread, "Bad thread pointer");
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diff changeset
472
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473 thread->release();
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diff changeset
474
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475 CYG_INSTRUMENT_MUTEX(RELEASED, this, thread);
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diff changeset
476
443894e2e912 Block commit of eCos version 1.2.1
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diff changeset
477 }
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diff changeset
478
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479 CYG_ASSERTCLASS( this, "Bad this pointer");
443894e2e912 Block commit of eCos version 1.2.1
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diff changeset
480
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diff changeset
481 // Unlock the scheduler and maybe switch threads
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diff changeset
482 Cyg_Scheduler::unlock();
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diff changeset
483
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diff changeset
484 CYG_REPORT_RETURN();
0
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485 }
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486
115
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487 // -------------------------------------------------------------------------
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488 // Set ceiling priority for priority ceiling protocol
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diff changeset
489
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490 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_CEILING
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491
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492 void Cyg_Mutex::set_ceiling( cyg_priority priority )
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493 {
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494 CYG_REPORT_FUNCTION();
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diff changeset
495
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496 // CYG_ASSERT( priority >= CYG_THREAD_MAX_PRIORITY, "Priority out of range");
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497 // CYG_ASSERT( priority <= CYG_THREAD_MIN_PRIORITY, "Priority out of range");
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498
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499 // Prevent preemption
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500 Cyg_Scheduler::lock();
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diff changeset
501
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502 ceiling = priority;
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diff changeset
503
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504 // Unlock the scheduler
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505 Cyg_Scheduler::unlock();
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diff changeset
506
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507 CYG_REPORT_RETURN();
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508 }
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diff changeset
509
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510 #endif
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511
177
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512 // -------------------------------------------------------------------------
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513 // Set priority inversion protocol
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514
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515 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DYNAMIC
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516 void Cyg_Mutex::set_protocol( cyg_protcol new_protocol )
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517 {
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518 CYG_REPORT_FUNCTION();
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diff changeset
519
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520 // Prevent preemption
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521 Cyg_Scheduler::lock();
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diff changeset
522
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523 protocol = new_protocol;
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524
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525 // Unlock the scheduler
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526 Cyg_Scheduler::unlock();
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527
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528 CYG_REPORT_RETURN();
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529 }
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530
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531 #endif
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532
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533
0
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534 //==========================================================================
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535 // Condition variables
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536
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537 Cyg_Condition_Variable::Cyg_Condition_Variable(
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538 Cyg_Mutex &mx // linked mutex
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539 )
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540 {
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541 CYG_REPORT_FUNCTION();
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542
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543 mutex = &mx;
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544
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545 CYG_ASSERTCLASS( mutex, "Invalid mutex argument");
2
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546
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547 CYG_REPORT_RETURN();
0
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548 }
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549
115
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550 Cyg_Condition_Variable::Cyg_Condition_Variable()
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551 {
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552 CYG_REPORT_FUNCTION();
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553
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554 mutex = NULL;
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555
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556 CYG_REPORT_RETURN();
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557 }
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558
0
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559 // -------------------------------------------------------------------------
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560 // Destructor
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561
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562 Cyg_Condition_Variable::~Cyg_Condition_Variable()
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563 {
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564 CYG_REPORT_FUNCTION();
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565
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566 CYG_ASSERT( queue.empty(), "Deleting condvar with waiting threads");
2
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567
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568 CYG_REPORT_RETURN();
0
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569 }
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570
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571 // -------------------------------------------------------------------------
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572
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573 #ifdef CYGDBG_USE_ASSERTS
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574
78
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575 cyg_bool
2
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576 Cyg_Condition_Variable::check_this( cyg_assert_class_zeal zeal) const
0
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577 {
2
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578 bool result = true;
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579
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580 CYG_REPORT_FUNCTYPE("returning %d");
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581 CYG_REPORT_FUNCARG1("zeal = %d", zeal);
0
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582
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583 // check that we have a non-NULL pointer first
2
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584 if( this == NULL )
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585 result = false;
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586 else {
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587
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588 switch( zeal )
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589 {
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590 case cyg_system_test:
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591 case cyg_extreme:
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592 case cyg_thorough:
115
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593 if( mutex != NULL && !mutex->check_this(zeal) )
2
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594 result = false;
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595 case cyg_quick:
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596 case cyg_trivial:
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597 case cyg_none:
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598 default:
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599 break;
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600 }
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601 }
0
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602
2
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603 CYG_REPORT_RETVAL(result);
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604 return result;
0
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605 }
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606
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607 #endif
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608
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609 // -------------------------------------------------------------------------
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610 // Wait for condition to be true
2
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611 // Note: if this function is entered with the scheduler locked (e.g. to
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612 // suspend DSR processing) then there is no need to take the lock. Also
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613 // in this case, exit with the scheduler locked, which allows this function
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614 // to be used in a totally thread-safe manner.
0
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615
115
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diff changeset
616 cyg_bool
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617 Cyg_Condition_Variable::wait_inner( Cyg_Mutex *mx )
0
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618 {
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619 CYG_REPORT_FUNCTION();
115
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620
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621 cyg_bool result = true;
0
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622 Cyg_Thread *self = Cyg_Thread::self();
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623
124
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624 Cyg_Scheduler::lock();
0
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625
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626 CYG_ASSERTCLASS( this, "Bad this pointer");
115
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627 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
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628 CYG_ASSERTCLASS( self, "Bad self thread");
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629
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630 CYG_INSTRUMENT_CONDVAR(WAIT, this, 0);
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631
115
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632 mx->unlock();
0
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633
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634 self->set_sleep_reason( Cyg_Thread::WAIT );
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635
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636 self->sleep();
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637
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638 queue.enqueue( self );
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639
115
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640 // Avoid calling ASRs during the following unlock.
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diff changeset
641 self->set_asr_inhibit();
0
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642
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643 // Unlock the scheduler and switch threads
124
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diff changeset
644 Cyg_Scheduler::unlock_reschedule();
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645
115
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646 // Allow ASRs again
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diff changeset
647 self->clear_asr_inhibit();
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648
0
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649 CYG_INSTRUMENT_CONDVAR(WOKE, this, self->get_wake_reason());
115
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650
0
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651 CYG_ASSERTCLASS( this, "Bad this pointer");
115
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652 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
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653
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654 switch( self->get_wake_reason() )
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655 {
115
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diff changeset
656 case Cyg_Thread::DESTRUCT: // which, the cv or the mutex?
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diff changeset
657 case Cyg_Thread::BREAK:
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diff changeset
658 result = false;
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diff changeset
659 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
660
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
661 case Cyg_Thread::EXIT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
662 self->exit();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
663 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
664
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
665 default:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
666 break;
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
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
669 // When we awake, we must re-acquire the mutex. Note that while
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
670 // it is essential to release the mutex and queue on the CV
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
671 // atomically relative to other threads, to avoid races, it is not
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
672 // necessary for us to re-acquire the mutex in the same atomic
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
673 // 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
674 // 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
675 // 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
676 // mutex claimed.
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
677
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
678 while ( !mx->lock() )
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
679 continue;
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
680
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
681 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
682 CYG_ASSERTCLASS( mx, "Corrupt mutex");
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
683 CYG_ASSERT( mx->owner == self, "Not mutex owner");
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
684
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
685 CYG_REPORT_RETURN();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
686
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
687 return result;
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
688 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
689
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
690 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
691 // Wake one thread
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
692
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
693 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
694 Cyg_Condition_Variable::signal(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
695 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
696 CYG_REPORT_FUNCTION();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
697
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
698 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
699
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
700 // Prevent preemption
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
701 Cyg_Scheduler::lock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
702
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
703 CYG_INSTRUMENT_CONDVAR(SIGNAL, this, 0);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
704
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
705 if( !queue.empty() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
706 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
707 // The queue is non-empty, so grab the next
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
708 // thread from it and wake it up.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
709
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
710 Cyg_Thread *thread = queue.dequeue();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
711
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
712 CYG_ASSERTCLASS( thread, "Bad thread pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
713
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
714 thread->set_wake_reason( Cyg_Thread::DONE );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
715
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
716 thread->wake();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
717
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
718 CYG_INSTRUMENT_CONDVAR(WAKE, this, thread);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
719
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
720 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
721
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
722 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
723
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
724 // Unlock the scheduler and maybe switch threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
725 Cyg_Scheduler::unlock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
726
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
727 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
728 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
729
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
730 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
731 // Set cond true, wake all threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
732
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
733 void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
734 Cyg_Condition_Variable::broadcast(void)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
735 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
736 CYG_REPORT_FUNCTION();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
737
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
738 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
739
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
740 // Prevent preemption
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
741 Cyg_Scheduler::lock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
742
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
743 CYG_INSTRUMENT_CONDVAR(BROADCAST, this, 0);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
744
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
745 // Grab all the threads from the queue and let them
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
746 // go.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
747
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
748 while( !queue.empty() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
749 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
750 Cyg_Thread *thread = queue.dequeue();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
751
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
752 CYG_ASSERTCLASS( thread, "Bad thread pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
753
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
754 thread->set_wake_reason( Cyg_Thread::DONE );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
755
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
756 thread->wake();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
757
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
758 CYG_INSTRUMENT_CONDVAR(WAKE, this, thread);
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
759 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
760
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
761 CYG_ASSERTCLASS( this, "Bad this pointer");
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
762
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
763 // Unlock the scheduler and maybe switch threads
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
764 Cyg_Scheduler::unlock();
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
765
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
766 CYG_REPORT_RETURN();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
767 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
768
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
769 // -------------------------------------------------------------------------
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
770 // Optional timed wait on a CV
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
771
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
772 #if defined(CYGMFN_KERNEL_SYNCH_CONDVAR_TIMED_WAIT)
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
773
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
774 cyg_bool
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
775 Cyg_Condition_Variable::wait_inner( Cyg_Mutex *mx, cyg_tick_count timeout )
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
776 {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
777 CYG_REPORT_FUNCTYPE("returning %d");
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents: 0
diff changeset
778 CYG_REPORT_FUNCARG1("timeout = %d", timeout);
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
779
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
780 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
781 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
782
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
783 cyg_bool result = true;
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 Cyg_Thread *self = Cyg_Thread::self();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
786
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
787 CYG_ASSERTCLASS( self, "Bad self thread");
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 // Prevent preemption
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
790 Cyg_Scheduler::lock();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
791
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
792 CYG_INSTRUMENT_CONDVAR(TIMED_WAIT, this, 0 );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
793
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
794 mx->unlock();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
795
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
796 // The ordering of sleep() and set_timer() here are
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
797 // important. If the timeout is in the past, the thread
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
798 // will be woken up immediately and will not sleep.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
799
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
800 self->sleep();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
801
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
802 // Set the timer and sleep reason
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
803 self->set_timer( timeout, Cyg_Thread::TIMEOUT );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
804
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
805 // Only enqueue if the timeout has not already fired.
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
806 if( self->get_wake_reason() == Cyg_Thread::NONE )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
807 queue.enqueue( self );
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
808
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
809 // Avoid calling ASRs during the following unlock.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
810 self->set_asr_inhibit();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
811
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
812 // Unlock the scheduler and switch threads
124
0ec04793409a Merge from eCos master repository on 2000-09-11-03:00:13-BST
jlarmour
parents: 115
diff changeset
813 Cyg_Scheduler::unlock_reschedule();
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
814
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
815 // Allow ASRs again
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
816 self->clear_asr_inhibit();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 78
diff changeset
817
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
818 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
819 CYG_ASSERTCLASS( mx, "Corrupt mutex");
0
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
820
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
821 self->clear_timer();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
822
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
823 CYG_INSTRUMENT_CONDVAR(WOKE, this, self->get_wake_reason());
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
824
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
825 switch( self->get_wake_reason() )
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
826 {
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
827 case Cyg_Thread::TIMEOUT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
828 case Cyg_Thread::DESTRUCT: // which, the cv or the mutex?
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
829 case Cyg_Thread::BREAK:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
830 result = false;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
831 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
832
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
833 case Cyg_Thread::EXIT:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
834 self->exit();
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
835 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
836
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
837 default:
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
838 break;
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
839 }
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
840
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
841
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
842 // When we awake, we must re-acquire the mutex. Note that while
3111d98ba7b3 Initial commit of eCos version 1.1
jlarmour
parents:
diff changeset
843 // it is essential to release the mutex and queue on the CV
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844 // atomically relative to other threads, to avoid races, it is not
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845 // necessary for us to re-acquire the mutex in the same atomic
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846 // action. Hence we can do it after unlocking the scheduler.
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847
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848 while ( !mx->lock() )
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849 continue;
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850
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851 CYG_ASSERTCLASS( this, "Bad this pointer");
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852 CYG_ASSERTCLASS( mx, "Corrupt mutex");
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853
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854 CYG_REPORT_RETVAL(result);
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855
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856 return result;
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857 }
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858
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859 #endif
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860
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861
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862 // -------------------------------------------------------------------------
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863 // EOF sync/mutex.cxx