annotate src/thread/bsdi/SDL_syssem.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents c9b51268668f
children 604d73db6802
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #include <stdlib.h>
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24 #include "SDL_error.h"
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25 #include "SDL_thread.h"
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26 #include "SDL_timer.h"
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27
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28 #ifdef SDL_USE_PTHREADS
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <unistd.h> /* For getpid() */
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33 #include <pthread.h>
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34
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35
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36 /*
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37 * This is semaphore.h inlined here so that BSD/OS POSIX semaphore are
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38 * completely selfcontained without requiring any additional include files
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39 * or libraries not present in the stock system
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40 */
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41
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42 /* semaphore.h: POSIX 1003.1b semaphores */
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43
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44 /*-
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45 * Copyright (c) 1996, 1997
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46 * HD Associates, Inc. All rights reserved.
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47 *
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48 * Redistribution and use in source and binary forms, with or without
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49 * modification, are permitted provided that the following conditions
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50 * are met:
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51 * 1. Redistributions of source code must retain the above copyright
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52 * notice, this list of conditions and the following disclaimer.
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53 * 2. Redistributions in binary form must reproduce the above copyright
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54 * notice, this list of conditions and the following disclaimer in the
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55 * documentation and/or other materials provided with the distribution.
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56 * 3. All advertising materials mentioning features or use of this software
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57 * must display the following acknowledgement:
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58 * This product includes software developed by HD Associates, Inc
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59 * 4. Neither the name of the author nor the names of any co-contributors
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60 * may be used to endorse or promote products derived from this software
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61 * without specific prior written permission.
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62 *
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63 * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
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64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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66 * ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
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67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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73 * SUCH DAMAGE.
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74 *
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75 * $FreeBSD: src/sys/posix4/semaphore.h,v 1.6 2000/01/20 07:55:42 jasone Exp $
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76 */
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77
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78 #include <machine/limits.h>
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79
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80 #include <sys/types.h>
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81 #include <fcntl.h>
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82
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83 /* Opaque type definition. */
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84 struct sem;
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85 typedef struct sem *sem_t;
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86
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87 #define SEM_FAILED ((sem_t *)0)
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88 #define SEM_VALUE_MAX UINT_MAX
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89
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90 #include <sys/cdefs.h>
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91
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92 __BEGIN_DECLS
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93 int sem_init __P((sem_t *, int, unsigned int));
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94 int sem_destroy __P((sem_t *));
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95 sem_t *sem_open __P((const char *, int, ...));
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96 int sem_close __P((sem_t *));
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97 int sem_unlink __P((const char *));
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98 int sem_wait __P((sem_t *));
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99 int sem_trywait __P((sem_t *));
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100 int sem_post __P((sem_t *));
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101 int sem_getvalue __P((sem_t *, int *));
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102 __END_DECLS
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103
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104 /* END of inlined semaphore.h */
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105
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106 /* Wrapper around POSIX 1003.1b semaphores */
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107
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108 struct SDL_semaphore {
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109 sem_t *sem;
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110 sem_t sem_data;
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111 };
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112
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113 /* Create a semaphore, initialized with value */
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114 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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115 {
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116 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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117 if ( sem ) {
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118 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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119 SDL_SetError("sem_init() failed");
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120 SDL_free(sem);
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121 sem = NULL;
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122 } else {
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123 sem->sem = &sem->sem_data;
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124 }
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125 } else {
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126 SDL_OutOfMemory();
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127 }
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128 return sem;
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129 }
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130
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131 void SDL_DestroySemaphore(SDL_sem *sem)
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132 {
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133 if ( sem ) {
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134 sem_destroy(sem->sem);
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135 SDL_free(sem);
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136 }
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137 }
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138
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139 int SDL_SemTryWait(SDL_sem *sem)
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140 {
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141 int retval;
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142
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143 if ( ! sem ) {
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144 SDL_SetError("Passed a NULL semaphore");
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145 return -1;
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146 }
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147 retval = SDL_MUTEX_TIMEDOUT;
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148 if ( sem_trywait(sem->sem) == 0 )
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149 retval = 0;
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150 return retval;
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151 }
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152
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153 int SDL_SemWait(SDL_sem *sem)
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154 {
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155 int retval;
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156
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157 if ( ! sem ) {
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158 SDL_SetError("Passed a NULL semaphore");
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159 return -1;
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160 }
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161
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162 retval = sem_wait(sem->sem);
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163 if ( retval < 0 ) {
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164 SDL_SetError("sem_wait() failed");
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165 }
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166 return retval;
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167 }
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168
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169 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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170 {
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171 int retval;
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172
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173 if ( ! sem ) {
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174 SDL_SetError("Passed a NULL semaphore");
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175 return -1;
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176 }
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177
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178 /* Try the easy cases first */
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179 if ( timeout == 0 ) {
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180 return SDL_SemTryWait(sem);
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181 }
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182 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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183 return SDL_SemWait(sem);
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184 }
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185
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186 /* Ack! We have to busy wait... */
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187 timeout += SDL_GetTicks();
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188 do {
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189 retval = SDL_SemTryWait(sem);
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190 if ( retval == 0 ) {
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191 break;
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192 }
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193 SDL_Delay(1);
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194 } while ( SDL_GetTicks() < timeout );
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195
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196 return retval;
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197 }
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198
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199 Uint32 SDL_SemValue(SDL_sem *sem)
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200 {
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201 int ret = 0;
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202 if ( sem ) {
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203 sem_getvalue(sem->sem, &ret);
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204 if ( ret < 0 ) {
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205 ret = 0;
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206 }
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207 }
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208 return (Uint32)ret;
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209 }
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210
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211 int SDL_SemPost(SDL_sem *sem)
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212 {
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213 int retval;
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214
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215 if ( ! sem ) {
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216 SDL_SetError("Passed a NULL semaphore");
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217 return -1;
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218 }
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219
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220 retval = sem_post(sem->sem);
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221 if ( retval < 0 ) {
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222 SDL_SetError("sem_post() failed");
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223 }
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224 return retval;
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225 }
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226
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227 /*
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228 * BEGIN inlined uthread_sem.c. This is done here so that no extra libraries
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229 * or include files not present in BSD/OS are required
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230 */
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231
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232 /*
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233 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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234 * All rights reserved.
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235 *
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236 * Redistribution and use in source and binary forms, with or without
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237 * modification, are permitted provided that the following conditions
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238 * are met:
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239 * 1. Redistributions of source code must retain the above copyright
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240 * notice(s), this list of conditions and the following disclaimer as
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241 * the first lines of this file unmodified other than the possible
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242 * addition of one or more copyright notices.
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243 * 2. Redistributions in binary form must reproduce the above copyright
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244 * notice(s), this list of conditions and the following disclaimer in
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245 * the documentation and/or other materials provided with the
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246 * distribution.
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247 *
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248 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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249 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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250 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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251 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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252 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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253 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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254 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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255 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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256 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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257 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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258 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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259 *
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260 * $FreeBSD: src/lib/libc_r/uthread/uthread_sem.c,v 1.3.2.1 2000/07/18 02:05:57 jasone Exp $
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261 */
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262
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263 #include <errno.h>
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264 #include <pthread.h>
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265
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266 /* Begin thread_private.h kluge */
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267 /*
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268 * These come out of (or should go into) thread_private.h - rather than have
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269 * to copy (or symlink) the files from the source tree these definitions are
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270 * inlined here. Obviously these go away when this module is part of libc.
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271 */
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272 struct sem {
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273 #define SEM_MAGIC ((u_int32_t) 0x09fa4012)
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274 u_int32_t magic;
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275 pthread_mutex_t lock;
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276 pthread_cond_t gtzero;
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277 u_int32_t count;
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278 u_int32_t nwaiters;
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279 };
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280
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281 extern pthread_once_t _thread_init_once;
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282 extern int _threads_initialized;
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283 extern void _thread_init __P((void));
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284 #define THREAD_INIT() \
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285 (void) pthread_once(&_thread_init_once, _thread_init)
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286 #define THREAD_SAFE() \
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287 (_threads_initialized != 0)
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288
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289 #define _SEM_CHECK_VALIDITY(sem) \
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290 if ((*(sem))->magic != SEM_MAGIC) { \
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291 errno = EINVAL; \
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292 retval = -1; \
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293 goto RETURN; \
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294 }
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295 /* End thread_private.h kluge */
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296
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297 int
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298 sem_init(sem_t *sem, int pshared, unsigned int value)
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299 {
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300 int retval;
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301
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302 if (!THREAD_SAFE())
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303 THREAD_INIT();
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304
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305 /*
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306 * Range check the arguments.
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307 */
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308 if (pshared != 0) {
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309 /*
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310 * The user wants a semaphore that can be shared among
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311 * processes, which this implementation can't do. Sounds like a
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312 * permissions problem to me (yeah right).
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313 */
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314 errno = EPERM;
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315 retval = -1;
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316 goto RETURN;
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317 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
318
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
319 if (value > SEM_VALUE_MAX) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
320 errno = EINVAL;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
321 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
322 goto RETURN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
323 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
324
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
325 *sem = (sem_t)SDL_malloc(sizeof(struct sem));
256
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
326 if (*sem == NULL) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
327 errno = ENOSPC;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
328 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
329 goto RETURN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
330 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
331
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
332 /*
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
333 * Initialize the semaphore.
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
334 */
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
335 if (pthread_mutex_init(&(*sem)->lock, NULL) != 0) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
336 SDL_free(*sem);
256
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
337 errno = ENOSPC;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
338 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
339 goto RETURN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
340 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
341
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
342 if (pthread_cond_init(&(*sem)->gtzero, NULL) != 0) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
343 pthread_mutex_destroy(&(*sem)->lock);
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
344 SDL_free(*sem);
256
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
345 errno = ENOSPC;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
346 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
347 goto RETURN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
348 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
349
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
350 (*sem)->count = (u_int32_t)value;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
351 (*sem)->nwaiters = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
352 (*sem)->magic = SEM_MAGIC;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
353
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
354 retval = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
355 RETURN:
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
356 return retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
357 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
358
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
359 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
360 sem_destroy(sem_t *sem)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
361 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
362 int retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
363
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
364 _SEM_CHECK_VALIDITY(sem);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
365
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
366 /* Make sure there are no waiters. */
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
367 pthread_mutex_lock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
368 if ((*sem)->nwaiters > 0) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
369 pthread_mutex_unlock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
370 errno = EBUSY;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
371 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
372 goto RETURN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
373 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
374 pthread_mutex_unlock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
375
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
376 pthread_mutex_destroy(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
377 pthread_cond_destroy(&(*sem)->gtzero);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
378 (*sem)->magic = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
379
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
380 SDL_free(*sem);
256
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
381
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
382 retval = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
383 RETURN:
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
384 return retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
385 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
386
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
387 sem_t *
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
388 sem_open(const char *name, int oflag, ...)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
389 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
390 errno = ENOSYS;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
391 return SEM_FAILED;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
392 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
393
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
394 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
395 sem_close(sem_t *sem)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
396 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
397 errno = ENOSYS;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
398 return -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
399 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
400
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
401 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
402 sem_unlink(const char *name)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
403 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
404 errno = ENOSYS;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
405 return -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
406 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
407
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
408 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
409 sem_wait(sem_t *sem)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
410 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
411 int retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
412
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
413 pthread_testcancel();
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
414
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
415 _SEM_CHECK_VALIDITY(sem);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
416
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
417 pthread_mutex_lock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
418
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
419 while ((*sem)->count == 0) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
420 (*sem)->nwaiters++;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
421 pthread_cond_wait(&(*sem)->gtzero, &(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
422 (*sem)->nwaiters--;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
423 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
424 (*sem)->count--;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
425
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
426 pthread_mutex_unlock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
427
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
428 retval = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
429 RETURN:
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
430
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
431 pthread_testcancel();
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
432 return retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
433 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
434
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
435 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
436 sem_trywait(sem_t *sem)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
437 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
438 int retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
439
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
440 _SEM_CHECK_VALIDITY(sem);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
441
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
442 pthread_mutex_lock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
443
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
444 if ((*sem)->count > 0) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
445 (*sem)->count--;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
446 retval = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
447 } else {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
448 errno = EAGAIN;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
449 retval = -1;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
450 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
451
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
452 pthread_mutex_unlock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
453
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
454 RETURN:
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
455 return retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
456 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
457
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
458 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
459 sem_post(sem_t *sem)
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
460 {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
461 int retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
462
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
463 _SEM_CHECK_VALIDITY(sem);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
464
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
465 pthread_mutex_lock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
466
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
467 (*sem)->count++;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
468 if ((*sem)->nwaiters > 0) {
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
469 /*
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
470 * We must use pthread_cond_broadcast() rather than
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
471 * pthread_cond_signal() in order to assure that the highest
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
472 * priority thread is run by the scheduler, since
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
473 * pthread_cond_signal() signals waiting threads in FIFO order.
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
474 */
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
475 pthread_cond_broadcast(&(*sem)->gtzero);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
476 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
477
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
478 pthread_mutex_unlock(&(*sem)->lock);
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
479
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
480 retval = 0;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
481 RETURN:
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
482 return retval;
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
483 }
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
484
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
485 int
640dcf27d2f7 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
486 sem_getvalue(sem_t *sem, int *sval)
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487 {
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488 int retval;
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489
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490 _SEM_CHECK_VALIDITY(sem);
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491
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492 pthread_mutex_lock(&(*sem)->lock);
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493 *sval = (int)(*sem)->count;
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494 pthread_mutex_unlock(&(*sem)->lock);
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495
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496 retval = 0;
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497 RETURN:
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498 return retval;
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499 }
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500
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501 /* END of inlined uthread_sem.c */
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502 #endif /* SDL_USE_PTHREADS */