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annotate src/thread/pthread/SDL_syscond.c @ 1585:980d2a0dc2a3

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Date: Tue, 4 Mar 2003 15:05:31 -0800 From: "Jim" Subject: [SDL] Frame Buffer patches... Okay I'm new at patch generation - so please tell me if there's a better way I could have done this. Attached are two patch files generated with 'cvs diff -u' SDL-fb-open-lock.patch applies to SDL_fbvideo.c Modifies the open loop to check /dev/fb/0 found on devfs... Modifies the lock code to return failure if the current virtual terminal is not the one opened for frame buffer writing... Lock would hang forever if switched away (ctrl-alt-F1) ... SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c Switches default mouse mode based on SDL_MOUSEDRV - currently only accepts PS2 - otherwise default is MS Mouse. When the screen is switched - exisiting code (wrapped in ifdef SAVE_SCREEN_COTENTS) would save the wrong bit of the screen.... ( I run frame buffer 1600x1200, the size I requested was 800x600 - the save would save the top 800 lines (non biased) and restore them... Adding screen->offset fixed that ) However, if that option is not set, then a call to SDL_UpdateRect (full screen) is made. (which may have had it's contents changed since the screen is not entirely locked because of lock-failure patch) Jim [patches slightly tweaked for SDL 1.2.10]
author Sam Lantinga <slouken@libsdl.org>
date Wed, 22 Mar 2006 07:48:22 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
1361
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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 */
1402
d910939febfa Use consistent identifiers for the various platforms we support.
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22 #include "SDL_config.h"
1361
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23
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24 #include <sys/time.h>
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25 #include <unistd.h>
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26 #include <errno.h>
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27 #include <pthread.h>
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28
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29 #include "SDL_thread.h"
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30 #include "SDL_sysmutex_c.h"
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31
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32 struct SDL_cond
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33 {
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34 pthread_cond_t cond;
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35 };
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36
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37 /* Create a condition variable */
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38 SDL_cond * SDL_CreateCond(void)
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39 {
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40 SDL_cond *cond;
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41
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42 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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43 if ( cond ) {
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44 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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45 SDL_SetError("pthread_cond_init() failed");
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46 SDL_free(cond);
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47 cond = NULL;
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48 }
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49 }
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50 return(cond);
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51 }
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52
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53 /* Destroy a condition variable */
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54 void SDL_DestroyCond(SDL_cond *cond)
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55 {
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56 if ( cond ) {
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57 pthread_cond_destroy(&cond->cond);
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58 SDL_free(cond);
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59 }
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60 }
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61
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62 /* Restart one of the threads that are waiting on the condition variable */
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63 int SDL_CondSignal(SDL_cond *cond)
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64 {
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65 int retval;
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66
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67 if ( ! cond ) {
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68 SDL_SetError("Passed a NULL condition variable");
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69 return -1;
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70 }
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71
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72 retval = 0;
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73 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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74 SDL_SetError("pthread_cond_signal() failed");
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75 retval = -1;
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76 }
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77 return retval;
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78 }
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79
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80 /* Restart all threads that are waiting on the condition variable */
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81 int SDL_CondBroadcast(SDL_cond *cond)
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82 {
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83 int retval;
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84
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85 if ( ! cond ) {
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86 SDL_SetError("Passed a NULL condition variable");
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87 return -1;
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88 }
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89
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90 retval = 0;
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91 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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92 SDL_SetError("pthread_cond_broadcast() failed");
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93 retval = -1;
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94 }
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95 return retval;
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96 }
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97
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98 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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99 {
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100 int retval;
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101 struct timeval delta;
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102 struct timespec abstime;
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103
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104 if ( ! cond ) {
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105 SDL_SetError("Passed a NULL condition variable");
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106 return -1;
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107 }
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108
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109 gettimeofday(&delta, NULL);
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110
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111 abstime.tv_sec = delta.tv_sec + (ms/1000);
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112 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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113 if ( abstime.tv_nsec > 1000000000 ) {
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114 abstime.tv_sec += 1;
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115 abstime.tv_nsec -= 1000000000;
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116 }
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117
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118 tryagain:
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119 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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120 switch (retval) {
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121 case EINTR:
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122 goto tryagain;
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123 break;
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124 case ETIMEDOUT:
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125 retval = SDL_MUTEX_TIMEDOUT;
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126 break;
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127 case 0:
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128 break;
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129 default:
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130 SDL_SetError("pthread_cond_timedwait() failed");
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131 retval = -1;
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132 break;
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133 }
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134 return retval;
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135 }
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136
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137 /* Wait on the condition variable, unlocking the provided mutex.
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138 The mutex must be locked before entering this function!
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139 */
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140 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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141 {
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142 int retval;
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143
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144 if ( ! cond ) {
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145 SDL_SetError("Passed a NULL condition variable");
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146 return -1;
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147 }
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148
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149 retval = 0;
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150 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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151 SDL_SetError("pthread_cond_wait() failed");
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152 retval = -1;
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153 }
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154 return retval;
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155 }