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annotate src/thread/pthread/SDL_syssem.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 dc6b59e925a2
children aee7ea396f59
rev   line source
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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 #include <pthread.h>
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25 #include <semaphore.h>
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26
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27 #include "SDL_thread.h"
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28 #include "SDL_timer.h"
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29
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30 /* Wrapper around POSIX 1003.1b semaphores */
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31
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32 #ifdef __MACOSX__
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33 #define USE_NAMED_SEMAPHORES 1
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34 #include <unistd.h>
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35 #endif
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36
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37 struct SDL_semaphore {
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38 sem_t *sem;
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39 #if !USE_NAMED_SEMAPHORES
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40 sem_t sem_data;
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41 #endif
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42 };
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43
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44 /* Create a semaphore, initialized with value */
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45 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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48 if ( sem ) {
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49 #if USE_NAMED_SEMAPHORES
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50 static int semnum = 0;
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51 char name[32];
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52
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53 SDL_snprintf(name, SDL_arraysize(name), "/SDL_sem-%d-%4.4d", getpid(), semnum++);
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54 sem->sem = sem_open(name, O_CREAT, 0600, initial_value);
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55 if ( sem->sem == (sem_t *)SEM_FAILED ) {
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56 SDL_SetError("sem_open(%s) failed", name);
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57 SDL_free(sem);
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58 sem = NULL;
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59 } else {
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60 sem_unlink(name);
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61 }
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62 #else
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63 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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64 SDL_SetError("sem_init() failed");
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65 SDL_free(sem);
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66 sem = NULL;
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67 } else {
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68 sem->sem = &sem->sem_data;
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69 }
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70 #endif /* USE_NAMED_SEMAPHORES */
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71 } else {
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72 SDL_OutOfMemory();
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73 }
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74 return sem;
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75 }
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76
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77 void SDL_DestroySemaphore(SDL_sem *sem)
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78 {
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79 if ( sem ) {
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80 #if USE_NAMED_SEMAPHORES
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81 sem_close(sem->sem);
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82 #else
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83 sem_destroy(sem->sem);
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84 #endif
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85 SDL_free(sem);
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86 }
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87 }
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88
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89 int SDL_SemTryWait(SDL_sem *sem)
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90 {
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91 int retval;
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92
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93 if ( ! sem ) {
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94 SDL_SetError("Passed a NULL semaphore");
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95 return -1;
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96 }
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97 retval = SDL_MUTEX_TIMEDOUT;
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98 if ( sem_trywait(sem->sem) == 0 ) {
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99 retval = 0;
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100 }
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101 return retval;
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102 }
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103
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104 int SDL_SemWait(SDL_sem *sem)
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105 {
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106 int retval;
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107
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108 if ( ! sem ) {
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109 SDL_SetError("Passed a NULL semaphore");
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110 return -1;
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111 }
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112
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113 retval = sem_wait(sem->sem);
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114 if ( retval < 0 ) {
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115 SDL_SetError("sem_wait() failed");
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116 }
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117 return retval;
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118 }
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119
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120 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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121 {
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122 int retval;
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123
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124 if ( ! sem ) {
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125 SDL_SetError("Passed a NULL semaphore");
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126 return -1;
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127 }
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128
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129 /* Try the easy cases first */
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130 if ( timeout == 0 ) {
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131 return SDL_SemTryWait(sem);
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132 }
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133 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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134 return SDL_SemWait(sem);
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135 }
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136
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137 /* Ack! We have to busy wait... */
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138 timeout += SDL_GetTicks();
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139 do {
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140 retval = SDL_SemTryWait(sem);
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141 if ( retval == 0 ) {
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142 break;
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143 }
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144 SDL_Delay(1);
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145 } while ( SDL_GetTicks() < timeout );
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146
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147 return retval;
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148 }
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149
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150 Uint32 SDL_SemValue(SDL_sem *sem)
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151 {
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152 int ret = 0;
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153 if ( sem ) {
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154 sem_getvalue(sem->sem, &ret);
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155 if ( ret < 0 ) {
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156 ret = 0;
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157 }
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158 }
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159 return (Uint32)ret;
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160 }
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161
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162 int SDL_SemPost(SDL_sem *sem)
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163 {
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164 int retval;
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165
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166 if ( ! sem ) {
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167 SDL_SetError("Passed a NULL semaphore");
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168 return -1;
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169 }
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170
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171 retval = sem_post(sem->sem);
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172 if ( retval < 0 ) {
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173 SDL_SetError("sem_post() failed");
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174 }
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175 return retval;
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176 }