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annotate src/thread/pthread/SDL_syssem.c @ 4216:5b99971a27b4 SDL-1.2

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Fixed bug #698 Hans de Goede 2009-02-13 01:10:52 PST Since the new "glitch free" version of pulseaudio (used in Fedora 10 amongst others), the sound of SDL using apps (like a simple playmus call) has been crackling. While looking in to fixing this I noticed that the current pulseaudio code in SDL uses pa_simple. However pa_simple uses a thread to pump pulseaudio events and ipc, given that SDL already has its own thread for audio handling this is clearly suboptimal, leading to unnecessary context switching IPC, etc. Also pa_simple does not allow one to implement the WaitAudio() callback for SDL audiodrivers properly. Given that my work is mostly a rewrite (although some original pieces remain) I'm attaching the new .c and .h file, as that is easier to review then the huge diff. Let me know if you also want the diff. This new version has the following features: -no longer use an additional thread next to the SDL sound thread -do not crackle with glitch free audio -when used with a newer pulse, which does glitch free audio, the total latency is the same as with the alsa driver -proper WaitAudio() implementation, saving another mixlen worth of latency -adds a WaitDone() implementation This patch has been written in consultancy with Lennart Poetering (the pulseaudio author) and has been reviewed by him for correct use of the pa API.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 09:27:08 +0000
parents a1b03ba2fcd0
children 99acf3d856cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include <errno.h>
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27
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28 #include "SDL_thread.h"
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29 #include "SDL_timer.h"
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30
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31 /* Wrapper around POSIX 1003.1b semaphores */
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32
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33 #ifdef __MACOSX__
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34 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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35 #include "../generic/SDL_syssem.c"
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36 #else
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37
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38 struct SDL_semaphore {
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39 sem_t sem;
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40 };
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41
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42 /* Create a semaphore, initialized with value */
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43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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44 {
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45 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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46 if ( sem ) {
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47 if ( sem_init(&sem->sem, 0, initial_value) < 0 ) {
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48 SDL_SetError("sem_init() failed");
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49 SDL_free(sem);
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50 sem = 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 sem;
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56 }
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57
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58 void SDL_DestroySemaphore(SDL_sem *sem)
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59 {
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60 if ( sem ) {
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61 sem_destroy(&sem->sem);
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62 SDL_free(sem);
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63 }
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64 }
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65
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66 int SDL_SemTryWait(SDL_sem *sem)
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67 {
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68 int retval;
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69
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70 if ( ! sem ) {
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71 SDL_SetError("Passed a NULL semaphore");
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72 return -1;
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73 }
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74 retval = SDL_MUTEX_TIMEDOUT;
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75 if ( sem_trywait(&sem->sem) == 0 ) {
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76 retval = 0;
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77 }
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78 return retval;
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79 }
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80
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81 int SDL_SemWait(SDL_sem *sem)
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82 {
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83 int retval;
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84
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85 if ( ! sem ) {
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86 SDL_SetError("Passed a NULL semaphore");
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87 return -1;
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88 }
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89
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90 while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
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91 if ( retval < 0 ) {
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92 SDL_SetError("sem_wait() failed");
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93 }
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94 return retval;
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95 }
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96
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97 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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98 {
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99 int retval;
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100
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101 if ( ! sem ) {
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102 SDL_SetError("Passed a NULL semaphore");
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103 return -1;
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104 }
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105
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106 /* Try the easy cases first */
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107 if ( timeout == 0 ) {
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108 return SDL_SemTryWait(sem);
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109 }
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110 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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111 return SDL_SemWait(sem);
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112 }
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113
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114 /* Ack! We have to busy wait... */
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115 /* FIXME: Use sem_timedwait()? */
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116 timeout += SDL_GetTicks();
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117 do {
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118 retval = SDL_SemTryWait(sem);
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119 if ( retval == 0 ) {
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120 break;
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121 }
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122 SDL_Delay(1);
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123 } while ( SDL_GetTicks() < timeout );
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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 Uint32 SDL_SemValue(SDL_sem *sem)
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129 {
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130 int ret = 0;
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131 if ( sem ) {
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132 sem_getvalue(&sem->sem, &ret);
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133 if ( ret < 0 ) {
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134 ret = 0;
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135 }
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136 }
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137 return (Uint32)ret;
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138 }
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139
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140 int SDL_SemPost(SDL_sem *sem)
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141 {
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142 int retval;
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143
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144 if ( ! sem ) {
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145 SDL_SetError("Passed a NULL semaphore");
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146 return -1;
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147 }
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148
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149 retval = sem_post(&sem->sem);
1361
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150 if ( retval < 0 ) {
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151 SDL_SetError("sem_post() failed");
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152 }
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153 return retval;
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154 }
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155
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156 #endif /* __MACOSX__ */