Mercurial > sdl-ios-xcode
annotate src/thread/pth/SDL_syscond.c @ 1635:92947e3a18db
Make sure code is only compiled if the appropriate subsystem is enabled
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 14 Apr 2006 04:46:47 +0000 |
parents | d910939febfa |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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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 #include "SDL_config.h" |
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23 |
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24 /* |
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25 * GNU pth conditions variables |
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26 * |
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27 * Patrice Mandin |
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28 */ |
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29 |
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30 #include <pth.h> |
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31 |
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32 #include "SDL_thread.h" |
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33 #include "SDL_sysmutex_c.h" |
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34 |
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35 struct SDL_cond |
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36 { |
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37 pth_cond_t condpth_p; |
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38 }; |
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39 |
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40 /* Create a condition variable */ |
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41 SDL_cond * SDL_CreateCond(void) |
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42 { |
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43 SDL_cond *cond; |
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44 |
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45 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); |
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46 if ( cond ) { |
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47 if ( pth_cond_init(&(cond->condpth_p)) < 0 ) { |
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48 SDL_SetError("pthread_cond_init() failed"); |
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49 SDL_free(cond); |
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50 cond = NULL; |
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51 } |
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52 } else { |
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53 SDL_OutOfMemory(); |
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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 SDL_DestroyCond(SDL_cond *cond) |
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60 { |
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61 if ( cond ) { |
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62 SDL_free(cond); |
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63 } |
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64 } |
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65 |
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66 /* Restart one of the threads that are waiting on the condition variable */ |
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67 int SDL_CondSignal(SDL_cond *cond) |
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68 { |
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69 int retval; |
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70 |
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71 if ( ! cond ) { |
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72 SDL_SetError("Passed a NULL condition variable"); |
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73 return -1; |
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74 } |
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75 |
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76 retval = 0; |
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77 if ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) { |
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78 SDL_SetError("pth_cond_notify() failed"); |
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79 retval = -1; |
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80 } |
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81 return retval; |
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82 } |
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83 |
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84 /* Restart all threads that are waiting on the condition variable */ |
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85 int SDL_CondBroadcast(SDL_cond *cond) |
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86 { |
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87 int retval; |
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88 |
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89 if ( ! cond ) { |
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90 SDL_SetError("Passed a NULL condition variable"); |
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91 return -1; |
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92 } |
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93 |
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94 retval = 0; |
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95 if ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) { |
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96 SDL_SetError("pth_cond_notify() failed"); |
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97 retval = -1; |
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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 /* Wait on the condition variable for at most 'ms' milliseconds. |
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103 The mutex must be locked before entering this function! |
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104 The mutex is unlocked during the wait, and locked again after the wait. |
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105 |
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106 Typical use: |
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107 |
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108 Thread A: |
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109 SDL_LockMutex(lock); |
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110 while ( ! condition ) { |
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111 SDL_CondWait(cond); |
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112 } |
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113 SDL_UnlockMutex(lock); |
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114 |
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115 Thread B: |
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116 SDL_LockMutex(lock); |
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117 ... |
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118 condition = true; |
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119 ... |
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120 SDL_UnlockMutex(lock); |
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121 */ |
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122 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) |
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123 { |
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124 int retval; |
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125 pth_event_t ev; |
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126 int sec; |
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127 |
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128 if ( ! cond ) { |
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129 SDL_SetError("Passed a NULL condition variable"); |
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130 return -1; |
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131 } |
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132 |
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133 retval = 0; |
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134 |
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135 sec = ms/1000; |
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136 ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000)); |
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137 |
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138 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) { |
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139 SDL_SetError("pth_cond_await() failed"); |
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140 retval = -1; |
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141 } |
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142 |
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143 pth_event_free(ev, PTH_FREE_ALL); |
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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 /* Wait on the condition variable forever */ |
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149 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) |
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150 { |
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151 int retval; |
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152 |
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153 if ( ! cond ) { |
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154 SDL_SetError("Passed a NULL condition variable"); |
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155 return -1; |
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156 } |
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157 |
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158 retval = 0; |
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159 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) { |
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160 SDL_SetError("pth_cond_await() failed"); |
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161 retval = -1; |
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162 } |
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163 return retval; |
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164 } |