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annotate src/thread/pthread/SDL_syscond.c @ 1554:0ca607a5d173

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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +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
19418e4422cb New configure-based build system. Still work in progress, but much improved
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13 Lesser General Public License for more details.
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14
19418e4422cb New configure-based build system. Still work in progress, but much improved
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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 }