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annotate packages/kernel/current/include/mqueue.inl @ 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
children f62680ef1804
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115
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1 #ifndef CYGONCE_KERNEL_MQUEUE_INL
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2 #define CYGONCE_KERNEL_MQUEUE_INL
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3 /*========================================================================
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4 //
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5 // mqueue.inl
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6 //
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7 // Message queues implementation
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8 //
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9 //========================================================================
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10 //####COPYRIGHTBEGIN####
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11 //
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12 // -------------------------------------------
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13 // The contents of this file are subject to the Red Hat eCos Public License
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14 // Version 1.1 (the "License"); you may not use this file except in
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15 // compliance with the License. You may obtain a copy of the License at
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16 // http://www.redhat.com/
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17 //
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18 // Software distributed under the License is distributed on an "AS IS"
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19 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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20 // License for the specific language governing rights and limitations under
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21 // the License.
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22 //
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23 // The Original Code is eCos - Embedded Configurable Operating System,
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24 // released September 30, 1998.
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25 //
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26 // The Initial Developer of the Original Code is Red Hat.
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27 // Portions created by Red Hat are
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28 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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29 // All Rights Reserved.
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30 // -------------------------------------------
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31 //
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32 //####COPYRIGHTEND####
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33 //========================================================================
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34 //#####DESCRIPTIONBEGIN####
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35 //
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36 // Author(s): jlarmour
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37 // Contributors:
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38 // Date: 2000-05-09
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39 // Purpose: This file provides the implementation for eCos message
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40 // queues
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41 // Description: This differs from the message boxes also supported
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42 // by eCos primarily because the requirements of message
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43 // queues are driven by POSIX semantics. POSIX semantics are
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44 // more dynamic and therefore heavyweight than Mboxes,
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45 // including prioritization, and variable sized queues and
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46 // message lengths
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47 // Usage: Do not include this file directly - instead
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48 // #include <cyg/kernel/mqueue.hxx>
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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
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55 /* CONFIGURATION */
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56
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57 #include <pkgconf/system.h>
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58 #include <pkgconf/kernel.h> // Configuration header
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59
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60 /* INCLUDES */
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61
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62 #include <stddef.h> // size_t, NULL
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63 #include <cyg/infra/cyg_type.h> // Types
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64 #include <cyg/kernel/mqueue.hxx> // Header for this file, just in case
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65 #include <cyg/infra/cyg_ass.h> // Assertion support
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66 #include <cyg/infra/cyg_trac.h> // Tracing support
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67 #include <cyg/kernel/sched.hxx> // scheduler
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68 #include <cyg/kernel/sched.inl> // scheduler inlines
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69 #include <cyg/kernel/sema.hxx> // Cyg_Counting_Semaphore
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70
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71 #ifdef CYGPKG_ISOINFRA
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72 # include <string.h> // memcpy
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73 #else
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74 externC void * memcpy( void *, const void *, size_t );
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75 #endif
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76
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77 // NOTE:
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78 // An alternative implementation based on mutexes and condition variables
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79 // rather than semaphores/scheduler locking was considered. But it was
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80 // not thought quite as good because it isn't driver safe. You would
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81 // also have to manage explicitly what counting semaphores do for you
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82 // intrinsically. Also with the mutex approach, the message queue would
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83 // be locked the whole time a new entry was being filled in, or copied out
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84 //
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85 // It also makes the non-blocking case properly non-blocking rather than
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86 // still being able to block while waiting for a mutex protecting
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87 // the message queue internal structures
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88
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89 /* INLINE FUNCTIONS */
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90
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91 //------------------------------------------------------------------------
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92
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93 inline cyg_bool
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94 Cyg_Mqueue::check_this( cyg_assert_class_zeal zeal ) const
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95 {
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96 if (zeal != cyg_none) {
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97 CYG_CHECK_DATA_PTRC(this); // extreme paranoia
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98
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99 #ifdef CYGDBG_USE_ASSERTS
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100 if ( qlen <= 0 || msgsize <= 0 )
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101 return false;
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102 #endif
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103
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104 if ( queuespacesize < sizeof(struct qentry)+1 )
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105 return false;
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106
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107 CYG_CHECK_DATA_PTRC(queuespace);
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108 CYG_CHECK_FUNC_PTRC(free_fn);
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109
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110 // prevent pre-emption through this. Not so bad since
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111 // this is only a diagnostic function
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112 Cyg_Scheduler::lock();
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113
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114 if (NULL != q)
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115 CYG_CHECK_DATA_PTRC(q);
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116 if (NULL != freelist)
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117 CYG_CHECK_DATA_PTRC(freelist);
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118 if (NULL != callback)
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119 CYG_CHECK_FUNC_PTRC(callback);
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120
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121 // check each queue entry
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122 long msgs=0, busymsgs=0;
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123 unsigned int oldprio=0;
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124 struct qentry *qtmp;
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125
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126 if ( NULL != q )
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127 oldprio = q->priority;
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128 for ( qtmp=q; NULL != qtmp; qtmp=qtmp->next ) {
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129 if ( NULL != qtmp->next )
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130 CYG_CHECK_DATA_PTRC( qtmp->next );
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131
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132 // queue should be priority ordered
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133 if ( qtmp->priority > oldprio )
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134 goto fail;
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135 oldprio = qtmp->priority;
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136
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137 #ifdef CYGDBG_USE_ASSERTS
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138 // valid length
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139 if ( !qtmp->busy )
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140 if ( qtmp->buflen > msgsize )
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141 goto fail;
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142 #endif
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143 if ( qtmp->busy )
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144 busymsgs++;
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145 else
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146 msgs++;
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147 } // for
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148
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149 long freemsgs=0;
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150
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151 // check that number of used and unused messages == q length
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152 for ( qtmp=freelist; NULL != qtmp; qtmp=qtmp->next ) {
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153 if ( NULL != qtmp->next )
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154 CYG_CHECK_DATA_PTRC( qtmp->next );
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155 if ( qtmp->busy )
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156 busymsgs++;
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157 else
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158 freemsgs++;
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159 }
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160
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161 #ifdef CYGDBG_USE_ASSERTS
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162 // and sum of all messages should be the total q length
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163 if ( qlen != (msgs+freemsgs+busymsgs) )
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164 goto fail;
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165 #endif
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166
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167 Cyg_Scheduler::unlock();
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168
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169 }
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170 return true; // object OK
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171 fail:
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172 Cyg_Scheduler::unlock();
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173 return false; // object fubar'd
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174 }
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175
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176 //------------------------------------------------------------------------
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177
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178 inline
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179 Cyg_Mqueue::Cyg_Mqueue( long maxmsgs, long maxmsgsize,
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180 qalloc_fn_t qalloc, qfree_fn_t qfree, qerr_t *err )
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181 : putsem(maxmsgs), getsem(0)
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182 {
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183 CYG_REPORT_FUNCTION();
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184 CYG_REPORT_FUNCARG5( "maxmsgs=%ld, maxmsgsize=%ld, qalloc=%08x, "
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185 "qfree=%08x, &err=%08x", maxmsgs, maxmsgsize,
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186 qalloc, qfree, err);
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187 CYG_PRECONDITIONC( (maxmsgs > 0) && (maxmsgsize > 0) );
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188 CYG_CHECK_DATA_PTRC( err );
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189 CYG_CHECK_FUNC_PTRC( qalloc );
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190 CYG_CHECK_FUNC_PTRC( qfree );
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191
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192 // mem to allocate for entire queue size. Also wants to be rounded
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193 // up so that the structs are aligned.
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194 const long addralign = sizeof(void *) - 1;
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195 long entrysize = (sizeof(struct qentry) + maxmsgsize + addralign)
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196 & ~addralign;
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197
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198 queuespacesize = entrysize * maxmsgs;
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199 queuespace = qalloc( queuespacesize );
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200
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201 if (NULL == queuespace) {
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202 *err=NOMEM;
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203 CYG_REPORT_RETURN();
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204 return;
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205 }
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206
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207 // link up freelist
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208 long i;
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209 struct qentry *qtmp;
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210 for ( i=0, qtmp=(struct qentry *)queuespace;
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211 i<maxmsgs-1;
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212 i++, qtmp=qtmp->next ) {
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213 qtmp->busy = false;
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214 qtmp->next = (struct qentry *)((char *)qtmp + entrysize);
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215 } // for
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216
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217 freelist = (struct qentry *)queuespace;
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218
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219 // set the last entry in the chain to the start to make the list circular
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220 qtmp->next = NULL;
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221 callback = NULL;
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222 q = NULL;
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223 free_fn = qfree;
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224 #ifdef CYGDBG_USE_ASSERTS
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225 qlen = maxmsgs;
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226 msgsize = maxmsgsize;
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227 #endif
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228
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229 *err = OK;
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230
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231 // object should be valid now
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232 CYG_ASSERT_THISC();
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233
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234 CYG_REPORT_RETURN();
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235 }
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236
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237 //------------------------------------------------------------------------
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238
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239 inline
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240 Cyg_Mqueue::~Cyg_Mqueue()
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241 {
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242 CYG_REPORT_FUNCTION();
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243
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244 if ( NULL != queuespace ) {
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245 // object should be valid if queuespace was successfully allocated
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246 CYG_ASSERT_THISC();
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247 free_fn( queuespace, queuespacesize );
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248 }
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249
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250 #ifdef CYGDBG_USE_ASSERTS
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251 qlen = msgsize = 0; // deliberately make it fail check_this() if used
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252 #endif
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253
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254 CYG_REPORT_RETURN();
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255 }
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256
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257 //------------------------------------------------------------------------
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258
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259 // put() copies len bytes of *buf into the queue at priority prio
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260 inline Cyg_Mqueue::qerr_t
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261 Cyg_Mqueue::put( const char *buf, size_t len, unsigned int prio, bool block )
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262 {
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263 CYG_REPORT_FUNCTYPE( "err=%d");
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264 CYG_REPORT_FUNCARG4( "buf=%08x, len=%ld, prio=%ud, block=%d",
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265 buf, len, prio, block==true );
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266 CYG_CHECK_DATA_PTRC( buf );
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267 CYG_ASSERT_THISC();
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268 CYG_PRECONDITIONC( len <= (size_t)msgsize );
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269
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270 qerr_t err;
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271 struct qentry *qtmp, *qent;
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272
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273 // wait till a freelist entry is available
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274 if ( true == block ) {
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275 if ( false == putsem.wait() ) {
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276 err = INTR;
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277 goto exit;
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278 }
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279 } else {
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280 if ( false == putsem.trywait() ) {
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281 err = WOULDBLOCK;
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282 goto exit;
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283 }
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284 }
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285
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286 // prevent preemption when fiddling with important members
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287 Cyg_Scheduler::lock();
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288
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289 CYG_ASSERT_THISC();
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290
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291 // get a queue entry from the freelist
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292 // don't need to check the freelist - the semaphore tells us there's
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293 // definitely a usable non-busy one there. It's just a question of
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294 // locating it.
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295
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296 if (!freelist->busy) { // fast-track common case
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297 qent = freelist;
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298 freelist = freelist->next;
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299 } else {
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300 for ( qtmp=freelist; !qtmp->next->busy; qtmp=qtmp->next )
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301 CYG_EMPTY_STATEMENT; // skip through
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302 qent = qtmp->next;
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303 qtmp->next = qent->next;
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304 }
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305
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306 // now put it in place in q
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307
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308 if ( NULL == q ) {
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309 q = qent;
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310 q->next = NULL;
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311 } else {
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312 struct qentry **qentp;
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313
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314 // insert into queue according to prio
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315 for ( qentp=&q; NULL != *qentp; qentp = &((*qentp)->next) ) {
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316 if ((*qentp)->priority < prio)
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317 break;
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318 } // for
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319
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320 qent->next = *qentp;
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321 *qentp = qent;
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322 } // else
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323
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324 qent->priority = prio; // have to set this now so when the sched is
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325 // unlocked, other qent's can be added in the
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326 // right place
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327 qent->busy = true; // let things know this entry should be ignored until
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328 // it's finished having its data copied
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329
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330 // unlock the scheduler, and potentially switch threads, but
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331 // that's okay now. We don't want it locked for the expensive memcpy
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332 Cyg_Scheduler::unlock();
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333
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334 qent->buflen = len;
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335 memcpy( qent->buf(), buf, len );
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336
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337 // make available now - setting non-atomically is alright if you think
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338 // about it - the only thing that matters is that it's completed before
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339 // the post()
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340 qent->busy = false;
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341
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342 // if we have to notify someone, we only do it if no-one's already
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343 // sitting waiting for a message to appear, AND if it's a transition
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344 // from empty to non-empty
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345
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346 if ( callback != NULL && !getsem.waiting() && (0 == getsem.peek()) ) {
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347 getsem.post();
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348 callback( *this, callback_data );
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349 } else
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350 getsem.post();
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351
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352 err = OK;
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353
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354 exit:
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355 CYG_ASSERT_THISC();
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356 CYG_REPORT_RETVAL(err);
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357 return err;
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358 } // Cyg_Mqueue::put()
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359
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360 //------------------------------------------------------------------------
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361
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362
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363 // get() returns the oldest highest priority message in the queue in *buf
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364 // and sets *prio to the priority (if prio is non-NULL) and *len to the
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365 // actual message size
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366
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367 inline Cyg_Mqueue::qerr_t
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368 Cyg_Mqueue::get( char *buf, size_t *len, unsigned int *prio, bool block )
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369 {
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370 CYG_REPORT_FUNCTYPE( "err=%d");
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371 CYG_REPORT_FUNCARG4( "buf=%08x, len=%08x, prio=%08x, block=%d",
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372 buf, len, prio, block==true );
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373 CYG_CHECK_DATA_PTRC( buf );
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374 CYG_CHECK_DATA_PTRC( len );
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375 if ( NULL != prio )
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376 CYG_CHECK_DATA_PTRC( prio );
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377 CYG_ASSERT_THISC();
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378
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379 qerr_t err;
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380 struct qentry *qent;
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381
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382 // wait till a q entry is available
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383 if ( true == block ) {
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diff changeset
384 if ( false == getsem.wait() ) {
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385 err = INTR;
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386 goto exit;
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387 }
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388 } else {
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389 if ( false == getsem.trywait() ) {
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390 err = WOULDBLOCK;
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391 goto exit;
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392 }
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393 }
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diff changeset
394
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diff changeset
395 // prevent preemption when fiddling with important members
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diff changeset
396
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397 Cyg_Scheduler::lock();
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diff changeset
398
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399 // don't need to check the q - the semaphore tells us there's
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400 // definitely a usable non-busy one there. It's just a question of
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401 // locating it.
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diff changeset
402
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diff changeset
403 if ( !q->busy ) { // fast-track the common case
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diff changeset
404 qent = q;
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diff changeset
405 q = qent->next;
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diff changeset
406 } else {
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diff changeset
407 struct qentry *qtmp;
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diff changeset
408
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409 for ( qtmp=q; !qtmp->next->busy; qtmp=qtmp->next )
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diff changeset
410 CYG_EMPTY_STATEMENT; // skip through
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diff changeset
411
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diff changeset
412 qent = qtmp->next;
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413 qtmp->next = qent->next;
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414 } // else
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diff changeset
415
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diff changeset
416 // now stick at front of freelist, but marked busy
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diff changeset
417 qent->next = freelist;
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diff changeset
418 freelist = qent;
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diff changeset
419
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420 qent->busy = true; // don't let it truly be part of the freelist just yet
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parents:
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421 // till the data is copied out
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diff changeset
422
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diff changeset
423 // unlock the scheduler, and potentially switch threads, but
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diff changeset
424 // that's okay now. We don't want it locked for the expensive memcpy
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425 Cyg_Scheduler::unlock();
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diff changeset
426
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diff changeset
427 *len = qent->buflen;
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diff changeset
428 if ( NULL != prio )
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429 *prio = qent->priority;
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430 memcpy( buf, qent->buf(), *len );
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431
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432 // make available now - setting non-atomically is alright if you think
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433 // about it - the only thing that matters is that it's completed before
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434 // the post()
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435 qent->busy = false;
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436
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437 putsem.post();
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438
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439 err = OK;
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440
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441 exit:
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442 CYG_ASSERT_THISC();
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443 CYG_REPORT_RETVAL(err);
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444 return err;
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445
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446 } // Cyg_Mqueue::get()
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447
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448 //------------------------------------------------------------------------
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449
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450 // count() returns the number of messages in the queue
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451 inline long
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452 Cyg_Mqueue::count()
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453 {
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454 CYG_REPORT_FUNCTYPE("curmsgs=%d");
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455
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456 long curmsgs = (long)getsem.peek();
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457
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458 CYG_REPORT_RETVAL(curmsgs);
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459 return curmsgs;
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460 } // Cyg_Mqueue::count()
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461
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462 //------------------------------------------------------------------------
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463
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464
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465 // Supply a callback function to call (with the supplied data argument)
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466 // when the queue goes from empty to non-empty (unless someone's already
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467 // doing a get()). This returns the old callback_fn, and if olddata is
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468 // non-NULL sets it to the old data (yes, really!)
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469 inline Cyg_Mqueue::callback_fn_t
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470 Cyg_Mqueue::setnotify( callback_fn_t callback_fn, CYG_ADDRWORD data,
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471 CYG_ADDRWORD *olddata)
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472 {
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473 CYG_REPORT_FUNCTYPE("old callback=%08x");
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474 CYG_REPORT_FUNCARG3XV( callback_fn, data, olddata );
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475 if ( NULL != callback_fn )
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476 CYG_CHECK_FUNC_PTRC( callback_fn );
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477 if (NULL != olddata)
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478 CYG_CHECK_DATA_PTRC( olddata );
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479
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480 callback_fn_t oldfn;
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481
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482 // Need to prevent preemption for accessing common structures
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483 // Just locking the scheduler has the least overhead
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484 Cyg_Scheduler::lock();
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485
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486 oldfn = callback;
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487 if (NULL != olddata)
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488 *olddata = callback_data;
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489
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490 callback_data = data;
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491 callback = callback_fn;
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492
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493 Cyg_Scheduler::unlock();
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494
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495 CYG_REPORT_RETVAL(oldfn);
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496 return oldfn;
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497 }
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498
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499 //------------------------------------------------------------------------
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500
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501 #endif /* CYGONCE_KERNEL_MQUEUE_INL multiple inclusion protection */
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502
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503 /* EOF mqueue.inl */