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annotate src/thread/dc/SDL_sysmutex.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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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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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
128
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
129 /* vi: set ts=4 sw=4 expandtab: */