Mercurial > sdl-ios-xcode
annotate src/thread/riscos/SDL_syscond.c @ 3359:aecbdf3362c3
Added some debug output to loopwave.c
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Sat, 10 Oct 2009 06:32:11 +0000 |
parents | 99210400e8b9 |
children | f7b03b6838cb |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 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 /* RISC OS implementations uses pthreads based on linux code */ |
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25 |
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New configure-based build system. Still work in progress, but much improved
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26 #if SDL_THREADS_DISABLED |
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27 #include "../generic/SDL_syscond.c" |
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28 #else |
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29 #include <sys/time.h> |
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30 #include <unistd.h> |
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31 #include <pthread.h> |
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32 |
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33 #include "SDL_thread.h" |
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34 #include "SDL_sysmutex_c.h" |
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35 |
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36 struct SDL_cond |
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37 { |
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38 pthread_cond_t cond; |
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39 }; |
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40 |
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41 /* Create a condition variable */ |
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42 SDL_cond * |
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43 SDL_CreateCond(void) |
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44 { |
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45 SDL_cond *cond; |
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46 |
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47 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); |
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48 if (cond) { |
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49 if (pthread_cond_init(&cond->cond, NULL) < 0) { |
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50 SDL_SetError("pthread_cond_init() failed"); |
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51 SDL_free(cond); |
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52 cond = NULL; |
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53 } |
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54 } |
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55 return (cond); |
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56 } |
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57 |
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58 /* Destroy a condition variable */ |
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59 void |
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60 SDL_DestroyCond(SDL_cond * cond) |
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61 { |
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62 if (cond) { |
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63 pthread_cond_destroy(&cond->cond); |
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64 SDL_free(cond); |
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65 } |
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66 } |
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67 |
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68 /* Restart one of the threads that are waiting on the condition variable */ |
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69 int |
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70 SDL_CondSignal(SDL_cond * cond) |
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71 { |
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72 int retval; |
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73 |
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74 if (!cond) { |
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75 SDL_SetError("Passed a NULL condition variable"); |
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76 return -1; |
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77 } |
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78 |
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79 retval = 0; |
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80 if (pthread_cond_signal(&cond->cond) != 0) { |
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81 SDL_SetError("pthread_cond_signal() failed"); |
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82 retval = -1; |
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83 } |
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84 return retval; |
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85 } |
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86 |
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87 /* Restart all threads that are waiting on the condition variable */ |
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88 int |
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89 SDL_CondBroadcast(SDL_cond * cond) |
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90 { |
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91 int retval; |
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92 |
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93 if (!cond) { |
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94 SDL_SetError("Passed a NULL condition variable"); |
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95 return -1; |
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96 } |
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97 |
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98 retval = 0; |
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99 if (pthread_cond_broadcast(&cond->cond) != 0) { |
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100 SDL_SetError("pthread_cond_broadcast() failed"); |
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101 retval = -1; |
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102 } |
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103 return retval; |
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104 } |
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105 |
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106 int |
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107 SDL_CondWaitTimeout(SDL_cond * cond, SDL_mutex * mutex, Uint32 ms) |
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108 { |
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109 int retval; |
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110 struct timeval delta; |
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111 struct timespec abstime; |
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112 |
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113 if (!cond) { |
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114 SDL_SetError("Passed a NULL condition variable"); |
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115 return -1; |
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116 } |
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117 |
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118 gettimeofday(&delta, NULL); |
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119 |
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120 abstime.tv_sec = delta.tv_sec + (ms / 1000); |
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121 abstime.tv_nsec = (delta.tv_usec + (ms % 1000) * 1000) * 1000; |
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122 if (abstime.tv_nsec > 1000000000) { |
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123 abstime.tv_sec += 1; |
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124 abstime.tv_nsec -= 1000000000; |
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125 } |
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126 |
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127 tryagain: |
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128 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); |
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129 switch (retval) { |
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130 case EINTR: |
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131 goto tryagain; |
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132 break; |
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133 case ETIMEDOUT: |
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134 retval = SDL_MUTEX_TIMEDOUT; |
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135 break; |
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136 case 0: |
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137 break; |
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138 default: |
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139 SDL_SetError("pthread_cond_timedwait() failed"); |
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140 retval = -1; |
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141 break; |
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142 } |
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143 return retval; |
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144 } |
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145 |
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146 /* Wait on the condition variable, unlocking the provided mutex. |
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147 The mutex must be locked before entering this function! |
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148 */ |
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149 int |
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150 SDL_CondWait(SDL_cond * cond, SDL_mutex * mutex) |
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151 { |
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152 int retval; |
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153 |
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154 if (!cond) { |
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155 SDL_SetError("Passed a NULL condition variable"); |
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156 return -1; |
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157 } |
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158 |
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159 retval = 0; |
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160 if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) { |
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161 SDL_SetError("pthread_cond_wait() failed"); |
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162 retval = -1; |
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163 } |
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164 return retval; |
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165 } |
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166 #endif |
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167 /* vi: set ts=4 sw=4 expandtab: */ |