Mercurial > sdl-ios-xcode
annotate src/thread/generic/SDL_sysmutex.c @ 4165:3b8ac3d311a2 SDL-1.2
Hello.
This patch provides basic support for video on the Sony PS3
Linux framebuffer. Scaling, format-conversion, and drawing is
done from the SPEs, so there is little performance impact to
PPE applications. This is by no means production quality code,
but it is a very good start and a good example of how to use the
PS3's hardware capabilities to accelerate video playback on
the box.
The driver has been verified to work with ffplay, mplayer and xine.
This piece of software has been developed at the IBM R&D Lab
in Boeblingen, Germany and is now returned to the community.
Enjoy !
Signed-off-by: D.Herrendoerfer < d.herrendoerfer [at] de [dot] ibm [dot] com >
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 02 Apr 2009 04:06:55 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* An implementation of mutexes using semaphores */ | |
| 25 | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_systhread_c.h" | |
| 28 | |
| 29 | |
| 30 struct SDL_mutex { | |
| 31 int recursive; | |
| 32 Uint32 owner; | |
| 33 SDL_sem *sem; | |
| 34 }; | |
| 35 | |
| 36 /* Create a mutex */ | |
| 37 SDL_mutex *SDL_CreateMutex(void) | |
| 38 { | |
| 39 SDL_mutex *mutex; | |
| 40 | |
| 41 /* Allocate mutex memory */ | |
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42 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); |
| 0 | 43 if ( mutex ) { |
| 44 /* Create the mutex semaphore, with initial value 1 */ | |
| 45 mutex->sem = SDL_CreateSemaphore(1); | |
| 46 mutex->recursive = 0; | |
| 47 mutex->owner = 0; | |
| 48 if ( ! mutex->sem ) { | |
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49 SDL_free(mutex); |
| 0 | 50 mutex = NULL; |
| 51 } | |
| 52 } else { | |
| 53 SDL_OutOfMemory(); | |
| 54 } | |
| 55 return mutex; | |
| 56 } | |
| 57 | |
| 58 /* Free the mutex */ | |
| 59 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 60 { | |
| 61 if ( mutex ) { | |
| 62 if ( mutex->sem ) { | |
| 63 SDL_DestroySemaphore(mutex->sem); | |
| 64 } | |
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65 SDL_free(mutex); |
| 0 | 66 } |
| 67 } | |
| 68 | |
| 69 /* Lock the semaphore */ | |
| 70 int SDL_mutexP(SDL_mutex *mutex) | |
| 71 { | |
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72 #if SDL_THREADS_DISABLED |
| 0 | 73 return 0; |
| 74 #else | |
| 75 Uint32 this_thread; | |
| 76 | |
| 77 if ( mutex == NULL ) { | |
| 78 SDL_SetError("Passed a NULL mutex"); | |
| 79 return -1; | |
| 80 } | |
| 81 | |
| 82 this_thread = SDL_ThreadID(); | |
| 83 if ( mutex->owner == this_thread ) { | |
| 84 ++mutex->recursive; | |
| 85 } else { | |
| 86 /* The order of operations is important. | |
| 87 We set the locking thread id after we obtain the lock | |
| 88 so unlocks from other threads will fail. | |
| 89 */ | |
| 90 SDL_SemWait(mutex->sem); | |
| 91 mutex->owner = this_thread; | |
| 92 mutex->recursive = 0; | |
| 93 } | |
| 94 | |
| 95 return 0; | |
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96 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 97 } |
| 98 | |
| 99 /* Unlock the mutex */ | |
| 100 int SDL_mutexV(SDL_mutex *mutex) | |
| 101 { | |
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Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
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102 #if SDL_THREADS_DISABLED |
| 0 | 103 return 0; |
| 104 #else | |
| 105 if ( mutex == NULL ) { | |
| 106 SDL_SetError("Passed a NULL mutex"); | |
| 107 return -1; | |
| 108 } | |
| 109 | |
| 110 /* If we don't own the mutex, we can't unlock it */ | |
| 111 if ( SDL_ThreadID() != mutex->owner ) { | |
| 112 SDL_SetError("mutex not owned by this thread"); | |
| 113 return -1; | |
| 114 } | |
| 115 | |
| 116 if ( mutex->recursive ) { | |
| 117 --mutex->recursive; | |
| 118 } else { | |
| 119 /* The order of operations is important. | |
| 120 First reset the owner so another thread doesn't lock | |
| 121 the mutex and set the ownership before we reset it, | |
| 122 then release the lock semaphore. | |
| 123 */ | |
| 124 mutex->owner = 0; | |
| 125 SDL_SemPost(mutex->sem); | |
| 126 } | |
| 127 return 0; | |
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Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
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128 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 129 } |