Mercurial > sdl-ios-xcode

annotate src/thread/irix/SDL_syssem.c @ 4222:6823a52d06fa SDL-1.2

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT Created an attachment (id=305) [details] patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:32 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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a1b03ba2fcd0 Updated copyright date
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3 Copyright (C) 1997-2009 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 #include "SDL_config.h"
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23
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24 #include "SDL_thread.h"
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25 #include "SDL_timer.h"
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26
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <sys/types.h>
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31 #include <sys/ipc.h>
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32 #include <sys/sem.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_thread.h"
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37
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38
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39 struct SDL_semaphore {
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40 int id;
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41 };
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42
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43 /* Not defined by many operating systems, use configure to detect */
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44 /*
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45 #if !defined(HAVE_SEMUN)
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46 union semun {
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47 int val;
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48 struct semid_ds *buf;
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49 ushort *array;
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50 };
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51 #endif
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52 */
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53
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54 static struct sembuf op_trywait[2] = {
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55 { 0, -1, (IPC_NOWAIT|SEM_UNDO) } /* Decrement semaphore, no block */
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56 };
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57 static struct sembuf op_wait[2] = {
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58 { 0, -1, SEM_UNDO } /* Decrement semaphore */
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59 };
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60 static struct sembuf op_post[1] = {
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61 { 0, 1, (IPC_NOWAIT|SEM_UNDO) } /* Increment semaphore */
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62 };
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63
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64 /* Create a blockable semaphore */
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65 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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66 {
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67 extern int _creating_thread_lock; /* SDL_threads.c */
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68 SDL_sem *sem;
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69 union semun init;
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70
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71 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
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72 if ( sem == NULL ) {
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73 SDL_OutOfMemory();
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74 return(NULL);
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75 }
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ad887c988713 Fixed bug #150
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76 sem->id = semget(IPC_PRIVATE, 1, (0600|IPC_CREAT));
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77 if ( sem->id < 0 ) {
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78 SDL_SetError("Couldn't create semaphore");
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79 SDL_free(sem);
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80 return(NULL);
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81 }
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82 init.val = initial_value; /* Initialize semaphore */
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83 semctl(sem->id, 0, SETVAL, init);
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84 return(sem);
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85 }
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86
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87 void SDL_DestroySemaphore(SDL_sem *sem)
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88 {
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89 if ( sem ) {
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90 #ifdef __IRIX__
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91 semctl(sem->id, 0, IPC_RMID);
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92 #else
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93 union semun dummy;
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94 dummy.val = 0;
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95 semctl(sem->id, 0, IPC_RMID, dummy);
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96 #endif
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97 SDL_free(sem);
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98 }
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99 }
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100
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101 int SDL_SemTryWait(SDL_sem *sem)
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102 {
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103 int retval;
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104
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105 if ( ! sem ) {
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106 SDL_SetError("Passed a NULL semaphore");
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107 return -1;
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108 }
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109
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110 retval = 0;
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111 tryagain:
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112 if ( semop(sem->id, op_trywait, 1) < 0 ) {
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113 if ( errno == EINTR ) {
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114 goto tryagain;
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115 }
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116 retval = SDL_MUTEX_TIMEDOUT;
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117 }
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118 return retval;
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119 }
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120
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121 int SDL_SemWait(SDL_sem *sem)
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122 {
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123 int retval;
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124
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125 if ( ! sem ) {
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126 SDL_SetError("Passed a NULL semaphore");
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127 return -1;
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128 }
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129
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130 retval = 0;
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131 tryagain:
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132 if ( semop(sem->id, op_wait, 1) < 0 ) {
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133 if ( errno == EINTR ) {
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134 goto tryagain;
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135 }
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136 SDL_SetError("Semaphore operation error");
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137 retval = -1;
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138 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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139 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
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140 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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141
19418e4422cb New configure-based build system. Still work in progress, but much improved
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142 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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143 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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144 int retval;
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145
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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146 if ( ! sem ) {
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147 SDL_SetError("Passed a NULL semaphore");
19418e4422cb New configure-based build system. Still work in progress, but much improved
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148 return -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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149 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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150
19418e4422cb New configure-based build system. Still work in progress, but much improved
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151 /* Try the easy cases first */
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152 if ( timeout == 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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153 return SDL_SemTryWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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154 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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155 if ( timeout == SDL_MUTEX_MAXWAIT ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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156 return SDL_SemWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
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157 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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158
19418e4422cb New configure-based build system. Still work in progress, but much improved
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159 /* Ack! We have to busy wait... */
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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160 timeout += SDL_GetTicks();
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
161 do {
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
162 retval = SDL_SemTryWait(sem);
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
163 if ( retval == 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164 break;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
165 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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166 SDL_Delay(1);
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
167 } while ( SDL_GetTicks() < timeout );
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
168
19418e4422cb New configure-based build system. Still work in progress, but much improved
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169 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
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170 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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171
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
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172 Uint32 SDL_SemValue(SDL_sem *sem)
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
173 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 int semval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
175 Uint32 value;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
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176
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
177 value = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
178 if ( sem ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 tryagain:
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1361
diff changeset
180 #ifdef __IRIX__
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
181 semval = semctl(sem->id, 0, GETVAL);
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
182 #else
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
183 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184 union semun arg;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
185 arg.val = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
186 semval = semctl(sem->id, 0, GETVAL, arg);
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188 #endif
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
189 if ( semval < 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 if ( errno == EINTR ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 goto tryagain;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
192 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193 } else {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194 value = (Uint32)semval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
197 return value;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
199
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 int SDL_SemPost(SDL_sem *sem)
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 int retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 if ( ! sem ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205 SDL_SetError("Passed a NULL semaphore");
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 return -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 retval = 0;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 tryagain:
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 if ( semop(sem->id, op_post, 1) < 0 ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 if ( errno == EINTR ) {
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 goto tryagain;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 SDL_SetError("Semaphore operation error");
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 retval = -1;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 return retval;
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 }