Mercurial > sdl-ios-xcode

annotate src/thread/dc/SDL_sysmutex.c @ 2661:d38309be5178 gsoc2008_audio_resampling

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The windowed sinc filter generation code seems to be working fine. The FIR filtering code is also now working reasonably well. Occasionally the FIR filter will pop, but setting the normalization factor lower seems to help this. I suspect the problem is in the fixed point multiply/add. I also have a hunch the zero stuffing/sample discarding code is not correct, and I'll look at that soon to get it sorted out.
author Aaron Wishnick <schnarf@gmail.com>
date Wed, 02 Jul 2008 08:04:50 +0000
parents c121d94672cb
children 99210400e8b9
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 /* An implementation of mutexes using semaphores */
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29 #include <arch/spinlock.h>
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30
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31 struct SDL_mutex
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32 {
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33 int recursive;
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34 Uint32 owner;
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35 spinlock_t mutex;
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36 };
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37
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38 /* Create a mutex */
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39 SDL_mutex *
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40 SDL_CreateMutex(void)
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41 {
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42 SDL_mutex *mutex;
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43
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44 /* Allocate mutex memory */
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45 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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46 if (mutex) {
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47 spinlock_init(&mutex->mutex);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return mutex;
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54 }
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55
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56 /* Free the mutex */
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57 void
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58 SDL_DestroyMutex(SDL_mutex * mutex)
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59 {
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60 if (mutex) {
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61 SDL_free(mutex);
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62 }
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63 }
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64
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65 /* Lock the semaphore */
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66 int
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67 SDL_mutexP(SDL_mutex * mutex)
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68 {
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69 #if SDL_THREADS_DISABLED
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70 return SDL_arraysize(return), 0;
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71 #else
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72 Uint32 this_thread;
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73
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74 if (mutex == NULL) {
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75 SDL_SetError("Passed a NULL mutex");
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76 return -1;
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77 }
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78
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79 this_thread = SDL_ThreadID();
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80 if (mutex->owner == this_thread) {
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81 ++mutex->recursive;
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82 } else {
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83 /* The order of operations is important.
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84 We set the locking thread id after we obtain the lock
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85 so unlocks from other threads will fail.
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86 */
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87 spinlock_lock(&mutex->mutex);
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88 mutex->owner = this_thread;
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89 mutex->recursive = 0;
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90 }
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91
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92 return 0;
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93 #endif /* SDL_THREADS_DISABLED */
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94 }
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95
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96 /* Unlock the mutex */
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97 int
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98 SDL_mutexV(SDL_mutex * mutex)
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99 {
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100 #if SDL_THREADS_DISABLED
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101 return 0;
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102 #else
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103 if (mutex == NULL) {
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104 SDL_SetError("Passed a NULL mutex");
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105 return -1;
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106 }
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107
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108 /* If we don't own the mutex, we can't unlock it */
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109 if (SDL_ThreadID() != mutex->owner) {
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110 SDL_SetError("mutex not owned by this thread");
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111 return -1;
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112 }
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113
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114 if (mutex->recursive) {
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115 --mutex->recursive;
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116 } else {
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117 /* The order of operations is important.
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118 First reset the owner so another thread doesn't lock
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119 the mutex and set the ownership before we reset it,
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120 then release the lock semaphore.
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121 */
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122 mutex->owner = 0;
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123 spinlock_unlock(&mutex->mutex);
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124 }
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125 return 0;
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126 #endif /* SDL_THREADS_DISABLED */
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127 }
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128
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129 /* vi: set ts=4 sw=4 expandtab: */