Mercurial > sdl-ios-xcode
annotate src/thread/pthread/SDL_syssem.c @ 1361:19418e4422cb
New configure-based build system. Still work in progress, but much improved
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 16 Feb 2006 10:11:48 +0000 |
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children | d910939febfa |
rev | line source |
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New configure-based build system. Still work in progress, but much improved
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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 <pthread.h> |
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24 #include <semaphore.h> |
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25 |
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26 #include "SDL_thread.h" |
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27 #include "SDL_timer.h" |
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28 |
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29 /* Wrapper around POSIX 1003.1b semaphores */ |
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30 |
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31 #if MACOSX |
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32 #define USE_NAMED_SEMAPHORES 1 |
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33 #endif /* MACOSX */ |
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34 |
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35 struct SDL_semaphore { |
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36 sem_t *sem; |
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37 #if !USE_NAMED_SEMAPHORES |
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38 sem_t sem_data; |
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39 #endif |
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40 }; |
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41 |
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42 /* Create a semaphore, initialized with value */ |
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43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) |
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44 { |
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45 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); |
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46 if ( sem ) { |
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47 #if USE_NAMED_SEMAPHORES |
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48 static int semnum = 0; |
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49 char name[32]; |
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50 |
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51 SDL_snprintf(name, SDL_arraysize(name), "/SDL_sem-%d-%4.4d", getpid(), semnum++); |
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52 sem->sem = sem_open(name, O_CREAT, 0600, initial_value); |
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53 if ( sem->sem == (sem_t *)SEM_FAILED ) { |
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54 SDL_SetError("sem_open(%s) failed", name); |
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55 SDL_free(sem); |
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56 sem = NULL; |
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57 } else { |
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58 sem_unlink(name); |
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59 } |
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60 #else |
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61 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) { |
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62 SDL_SetError("sem_init() failed"); |
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63 SDL_free(sem); |
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64 sem = NULL; |
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65 } else { |
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66 sem->sem = &sem->sem_data; |
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67 } |
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68 #endif /* USE_NAMED_SEMAPHORES */ |
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69 } else { |
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70 SDL_OutOfMemory(); |
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71 } |
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72 return sem; |
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73 } |
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74 |
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75 void SDL_DestroySemaphore(SDL_sem *sem) |
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76 { |
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77 if ( sem ) { |
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78 #if USE_NAMED_SEMAPHORES |
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79 sem_close(sem->sem); |
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80 #else |
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81 sem_destroy(sem->sem); |
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82 #endif |
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83 SDL_free(sem); |
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84 } |
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85 } |
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86 |
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87 int SDL_SemTryWait(SDL_sem *sem) |
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88 { |
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89 int retval; |
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90 |
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91 if ( ! sem ) { |
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92 SDL_SetError("Passed a NULL semaphore"); |
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93 return -1; |
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94 } |
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95 retval = SDL_MUTEX_TIMEDOUT; |
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96 if ( sem_trywait(sem->sem) == 0 ) { |
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97 retval = 0; |
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98 } |
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99 return retval; |
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100 } |
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101 |
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102 int SDL_SemWait(SDL_sem *sem) |
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103 { |
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104 int retval; |
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105 |
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106 if ( ! sem ) { |
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107 SDL_SetError("Passed a NULL semaphore"); |
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108 return -1; |
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109 } |
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110 |
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111 retval = sem_wait(sem->sem); |
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112 if ( retval < 0 ) { |
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113 SDL_SetError("sem_wait() failed"); |
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114 } |
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115 return retval; |
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116 } |
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117 |
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118 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) |
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119 { |
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120 int retval; |
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121 |
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122 if ( ! sem ) { |
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123 SDL_SetError("Passed a NULL semaphore"); |
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124 return -1; |
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125 } |
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126 |
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127 /* Try the easy cases first */ |
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128 if ( timeout == 0 ) { |
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129 return SDL_SemTryWait(sem); |
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130 } |
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131 if ( timeout == SDL_MUTEX_MAXWAIT ) { |
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132 return SDL_SemWait(sem); |
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133 } |
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134 |
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135 /* Ack! We have to busy wait... */ |
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136 timeout += SDL_GetTicks(); |
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137 do { |
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138 retval = SDL_SemTryWait(sem); |
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139 if ( retval == 0 ) { |
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140 break; |
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141 } |
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142 SDL_Delay(1); |
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143 } while ( SDL_GetTicks() < timeout ); |
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144 |
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145 return retval; |
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146 } |
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147 |
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148 Uint32 SDL_SemValue(SDL_sem *sem) |
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149 { |
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150 int ret = 0; |
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151 if ( sem ) { |
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152 sem_getvalue(sem->sem, &ret); |
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153 if ( ret < 0 ) { |
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154 ret = 0; |
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155 } |
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156 } |
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157 return (Uint32)ret; |
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158 } |
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159 |
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160 int SDL_SemPost(SDL_sem *sem) |
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161 { |
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162 int retval; |
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163 |
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164 if ( ! sem ) { |
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165 SDL_SetError("Passed a NULL semaphore"); |
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166 return -1; |
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167 } |
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168 |
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169 retval = sem_post(sem->sem); |
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170 if ( retval < 0 ) { |
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171 SDL_SetError("sem_post() failed"); |
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172 } |
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173 return retval; |
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174 } |