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annotate src/thread/dc/SDL_syssem.c @ 765:4c2ba6161939

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Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents dad72daf44b3
children b8d311d90021
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 BERO
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20 bero@geocities.co.jp
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21
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22 based on generic/SDL_syssem.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* An implementation of semaphores using mutexes and condition variables */
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34
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35 #include <stdlib.h>
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36
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37 #include "SDL_error.h"
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38 #include "SDL_timer.h"
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39 #include "SDL_thread.h"
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40 #include "SDL_systhread_c.h"
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41
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42
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43 #ifdef DISABLE_THREADS
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44
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45 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_SetError("SDL not configured with thread support");
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48 return (SDL_sem *)0;
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49 }
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50
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51 void SDL_DestroySemaphore(SDL_sem *sem)
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52 {
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53 return;
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54 }
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55
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56 int SDL_SemTryWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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63 {
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64 SDL_SetError("SDL not configured with thread support");
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65 return -1;
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66 }
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67
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68 int SDL_SemWait(SDL_sem *sem)
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69 {
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70 SDL_SetError("SDL not configured with thread support");
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71 return -1;
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72 }
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73
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74 Uint32 SDL_SemValue(SDL_sem *sem)
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75 {
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76 return 0;
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77 }
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78
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79 int SDL_SemPost(SDL_sem *sem)
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80 {
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81 SDL_SetError("SDL not configured with thread support");
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82 return -1;
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83 }
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84
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85 #else
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86
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87 #include <kos/sem.h>
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88
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89 struct SDL_semaphore
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90 {
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91 semaphore_t sem;
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92 };
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93
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94 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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95 {
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96 return (SDL_sem *)sem_create(initial_value);
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97 }
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98
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99 /* WARNING:
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100 You cannot call this function when another thread is using the semaphore.
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101 */
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102 void SDL_DestroySemaphore(SDL_sem *sem)
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103 {
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return;
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107 }
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108
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109 sem_destroy(&sem->sem);
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110 }
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111
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112 int SDL_SemTryWait(SDL_sem *sem)
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113 {
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114 int retval;
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115
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116 if ( ! sem ) {
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117 SDL_SetError("Passed a NULL semaphore");
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118 return -1;
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119 }
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120
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121 retval = sem_trywait(&sem->sem);
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122 if (retval==0) return 0;
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123 else return SDL_MUTEX_TIMEDOUT;
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124
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125 return retval;
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126 }
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127
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128 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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129 {
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130 int retval;
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131
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132 if ( ! sem ) {
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133 SDL_SetError("Passed a NULL semaphore");
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134 return -1;
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135 }
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136
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137 /* A timeout of 0 is an easy case */
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138 if ( timeout == 0 ) {
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139 return SDL_SemTryWait(sem);
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140 }
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141
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142 retval = sem_wait_timed(&sem->sem,timeout);
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143 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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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 int SDL_SemWait(SDL_sem *sem)
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149 {
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150 if ( ! sem ) {
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151 SDL_SetError("Passed a NULL semaphore");
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152 return -1;
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153 }
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154
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155 sem_wait(&sem->sem);
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156 return 0;
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157 }
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158
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159 Uint32 SDL_SemValue(SDL_sem *sem)
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160 {
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161 if ( ! sem ) {
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162 SDL_SetError("Passed a NULL semaphore");
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163 return -1;
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164 }
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165
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166 return sem_count(&sem->sem);
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167 }
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168
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169 int SDL_SemPost(SDL_sem *sem)
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170 {
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171 if ( ! sem ) {
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172 SDL_SetError("Passed a NULL semaphore");
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173 return -1;
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174 }
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175
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176 sem_signal(&sem->sem);
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177 return 0;
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178 }
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179
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180 #endif /* DISABLE_THREADS */