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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 74dbf4c3f2e1
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1 //==========================================================================
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2 //
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3 // sem.cxx
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4 //
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5 // POSIX semaphore implementation
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6 //
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7 //==========================================================================
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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/
208
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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
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45 // Date: 2000-03-27
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46 // Purpose: POSIX semaphore implementation
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47 // Description: This file contains the implementation of the POSIX semaphore
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48 // functions.
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49 //
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50 //
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <pkgconf/hal.h>
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57 #include <pkgconf/kernel.h>
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58 #include <pkgconf/posix.h>
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59
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60 #include <cyg/kernel/ktypes.h> // base kernel types
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61 #include <cyg/infra/cyg_trac.h> // tracing macros
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62 #include <cyg/infra/cyg_ass.h> // assertion macros
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63
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64 #include <semaphore.h> // our header
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65
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66 #include "pprivate.h" // POSIX private header
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67
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68 #include <cyg/kernel/thread.hxx> // Kernel threads
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69
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70 #include <cyg/kernel/thread.inl> // Cyg_ThreadQueue::empty()
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71
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72 #include <cyg/kernel/sema.hxx> // Kernel semaphores
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73
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74 // -------------------------------------------------------------------------
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75 // Internal definitions
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76
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77 // Handle entry to a pthread package function.
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78 #define SEMA_ENTRY() CYG_REPORT_FUNCTYPE( "returning %d" );
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79
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80 // Do a semaphore package defined return. This requires the error code
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81 // to be placed in errno, and if it is non-zero, -1 returned as the
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82 // result of the function. This also gives us a place to put any
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83 // generic tidyup handling needed for things like signal delivery and
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84 // cancellation.
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85 #define SEMA_RETURN(err) \
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86 CYG_MACRO_START \
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87 int __retval = 0; \
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88 if( err != 0 ) __retval = -1, errno = err; \
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89 CYG_REPORT_RETVAL( __retval ); \
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90 return __retval; \
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91 CYG_MACRO_END
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92
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93 //-----------------------------------------------------------------------------
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94 // new operator to allow us to invoke the Cyg_Thread constructor on the
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95 // user's semaphore object.
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96
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97 inline void *operator new(size_t size, void *ptr) { return (void *)ptr; };
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98
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99 // -------------------------------------------------------------------------
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100 // Initialize semaphore to value.
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101 // pshared is not supported under eCos.
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102
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103 externC int sem_init (sem_t *sem, int pshared, unsigned int value)
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104 {
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105 SEMA_ENTRY();
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106
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107 if( value > SEM_VALUE_MAX )
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108 SEMA_RETURN(EINVAL);
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109
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110 Cyg_Counting_Semaphore *sema;
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111
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112 sema = new((void *)sem) Cyg_Counting_Semaphore(value);
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113
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114 sema=sema;
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115
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116 SEMA_RETURN(0);
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117 }
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118
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119 // -------------------------------------------------------------------------
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120 // Destroy the semaphore.
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121
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122 externC int sem_destroy (sem_t *sem)
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123 {
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124 SEMA_ENTRY();
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125
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126 Cyg_Counting_Semaphore *sema = (Cyg_Counting_Semaphore *)sem;
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127
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128 // Check that the semaphore has no waiters
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129 if( sema->waiting() )
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130 SEMA_RETURN(EBUSY);
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131
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132 // Call the destructor
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133 sema->~Cyg_Counting_Semaphore();
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134
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135 SEMA_RETURN(0);
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136 }
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137
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138 // -------------------------------------------------------------------------
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139 // Decrement value if >0 or wait for a post.
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140
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141 externC int sem_wait (sem_t *sem)
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142 {
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143 int retval = 0;
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144
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145 SEMA_ENTRY();
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146
151
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147 #ifdef CYGPKG_POSIX_PTHREAD
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148 // check for cancellation first.
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149 pthread_testcancel();
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150 #endif
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151
115
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152 Cyg_Counting_Semaphore *sema = (Cyg_Counting_Semaphore *)sem;
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153
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154 if( !sema->wait() ) retval = EINTR;
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155
151
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156 #ifdef CYGPKG_POSIX_PTHREAD
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157 // check if we were woken because we were being cancelled
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158 pthread_testcancel();
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159 #endif
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160
115
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161 SEMA_RETURN(retval);
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162 }
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163
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164 // -------------------------------------------------------------------------
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165 // Decrement value if >0, return -1 if not.
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166
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167 externC int sem_trywait (sem_t *sem)
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168 {
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169 int retval = 0;
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170
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171 SEMA_ENTRY();
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172
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173 Cyg_Counting_Semaphore *sema = (Cyg_Counting_Semaphore *)sem;
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174
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175 if( !sema->trywait() ) retval = EAGAIN;
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176
183
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177 SEMA_RETURN(retval);
115
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178 }
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179
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180 // -------------------------------------------------------------------------
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181 // Increment value and wake a waiter if one is present.
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182
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183 externC int sem_post (sem_t *sem)
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184 {
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185 SEMA_ENTRY();
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186
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187 Cyg_Counting_Semaphore *sema = (Cyg_Counting_Semaphore *)sem;
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188
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189 sema->post();
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190
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191 SEMA_RETURN(0);
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192 }
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193
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194
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195 // -------------------------------------------------------------------------
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196 // Get current value
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197
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198 externC int sem_getvalue (sem_t *sem, int *sval)
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199 {
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200 SEMA_ENTRY();
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201
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202 Cyg_Counting_Semaphore *sema = (Cyg_Counting_Semaphore *)sem;
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203
208
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204 *sval = sema->peek();
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205
208
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206 CYG_REPORT_RETVAL( 0 );
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207 return 0;
115
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208 }
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209
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210 // -------------------------------------------------------------------------
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211 // Open an existing named semaphore, or create it.
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212
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213 externC sem_t *sem_open (const char *name, int oflag, ...)
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214 {
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215 SEMA_ENTRY();
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216
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217 errno = ENOSYS;
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218
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219 CYG_REPORT_RETVAL( SEM_FAILED );
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220 return SEM_FAILED;
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221 }
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222
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223 // -------------------------------------------------------------------------
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224 // Close descriptor for semaphore.
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225
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226 externC int sem_close (sem_t *sem)
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227 {
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228 SEMA_ENTRY();
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229
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230 SEMA_RETURN(ENOSYS);
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231 }
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232
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233 // -------------------------------------------------------------------------
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234 // Remove named semaphore
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235
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236 externC int sem_unlink (const char *name)
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237 {
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238 SEMA_ENTRY();
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239
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240 SEMA_RETURN(ENOSYS);
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241 }
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242
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243 // -------------------------------------------------------------------------
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244 // EOF sem.cxx