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annotate src/thread/generic/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
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30 struct SDL_mutex
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31 {
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32 int recursive;
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33 Uint32 owner;
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34 SDL_sem *sem;
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35 };
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36
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37 /* Create a mutex */
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38 SDL_mutex *
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39 SDL_CreateMutex(void)
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40 {
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41 SDL_mutex *mutex;
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42
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43 /* Allocate mutex memory */
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44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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45 if (mutex) {
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46 /* Create the mutex semaphore, with initial value 1 */
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47 mutex->sem = SDL_CreateSemaphore(1);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 if (!mutex->sem) {
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51 SDL_free(mutex);
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52 mutex = NULL;
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53 }
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54 } else {
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55 SDL_OutOfMemory();
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56 }
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57 return mutex;
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58 }
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59
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60 /* Free the mutex */
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61 void
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62 SDL_DestroyMutex(SDL_mutex * mutex)
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63 {
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64 if (mutex) {
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65 if (mutex->sem) {
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66 SDL_DestroySemaphore(mutex->sem);
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67 }
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68 SDL_free(mutex);
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69 }
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70 }
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71
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72 /* Lock the semaphore */
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73 int
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74 SDL_mutexP(SDL_mutex * mutex)
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75 {
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76 #if SDL_THREADS_DISABLED
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77 return 0;
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78 #else
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79 Uint32 this_thread;
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80
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81 if (mutex == NULL) {
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82 SDL_SetError("Passed a NULL mutex");
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83 return -1;
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84 }
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85
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86 this_thread = SDL_ThreadID();
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87 if (mutex->owner == this_thread) {
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88 ++mutex->recursive;
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89 } else {
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90 /* The order of operations is important.
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91 We set the locking thread id after we obtain the lock
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92 so unlocks from other threads will fail.
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93 */
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94 SDL_SemWait(mutex->sem);
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95 mutex->owner = this_thread;
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96 mutex->recursive = 0;
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97 }
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98
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99 return 0;
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100 #endif /* SDL_THREADS_DISABLED */
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101 }
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102
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103 /* Unlock the mutex */
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104 int
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105 SDL_mutexV(SDL_mutex * mutex)
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106 {
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107 #if SDL_THREADS_DISABLED
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108 return 0;
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109 #else
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110 if (mutex == NULL) {
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111 SDL_SetError("Passed a NULL mutex");
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112 return -1;
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113 }
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114
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115 /* If we don't own the mutex, we can't unlock it */
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116 if (SDL_ThreadID() != mutex->owner) {
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117 SDL_SetError("mutex not owned by this thread");
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118 return -1;
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119 }
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120
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121 if (mutex->recursive) {
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122 --mutex->recursive;
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123 } else {
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124 /* The order of operations is important.
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125 First reset the owner so another thread doesn't lock
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126 the mutex and set the ownership before we reset it,
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127 then release the lock semaphore.
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128 */
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129 mutex->owner = 0;
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130 SDL_SemPost(mutex->sem);
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131 }
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132 return 0;
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19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
133 #endif /* SDL_THREADS_DISABLED */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
134 }
1662
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
135
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
136 /* vi: set ts=4 sw=4 expandtab: */