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author | Steve Kondik <shade@chemlab.org> | 2012-11-18 15:47:18 -0800 |
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committer | Steve Kondik <shade@chemlab.org> | 2012-11-18 15:47:18 -0800 |
commit | a546c7006355a7bd1df4267ee53d0bfa2c017c8c (patch) | |
tree | 01be0bf6c0d6968e1468ec9661fd52110f9b05a7 /distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c | |
parent | baf3d7830396202df5cc47bd7bcee109c319cdb3 (diff) | |
parent | 0f809250987b64f491bd3b4b73c0f0d33036a786 (diff) | |
download | external_qemu-a546c7006355a7bd1df4267ee53d0bfa2c017c8c.zip external_qemu-a546c7006355a7bd1df4267ee53d0bfa2c017c8c.tar.gz external_qemu-a546c7006355a7bd1df4267ee53d0bfa2c017c8c.tar.bz2 |
Merge branch 'jb-mr1-release' of https://android.googlesource.com/platform/external/qemu into mr1-staging
Change-Id: I8a4a71ac65b08e6e17f26c942f67a15b85211115
Diffstat (limited to 'distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c')
-rw-r--r-- | distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c b/distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c new file mode 100644 index 0000000..9831ccd --- /dev/null +++ b/distrib/sdl-1.2.15/src/thread/dc/SDL_syssem.c @@ -0,0 +1,173 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ + +#include <errno.h> + +#include "SDL_config.h" + +/* An implementation of semaphores using mutexes and condition variables */ + +#include "SDL_timer.h" +#include "SDL_thread.h" +#include "SDL_systhread_c.h" + + +#if SDL_THREADS_DISABLED + +SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) +{ + SDL_SetError("SDL not configured with thread support"); + return (SDL_sem *)0; +} + +void SDL_DestroySemaphore(SDL_sem *sem) +{ + return; +} + +int SDL_SemTryWait(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +int SDL_SemWait(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +Uint32 SDL_SemValue(SDL_sem *sem) +{ + return 0; +} + +int SDL_SemPost(SDL_sem *sem) +{ + SDL_SetError("SDL not configured with thread support"); + return -1; +} + +#else + +#include <kos/sem.h> + +struct SDL_semaphore +{ + semaphore_t sem; +}; + +SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) +{ + return (SDL_sem *)sem_create(initial_value); +} + +/* WARNING: + You cannot call this function when another thread is using the semaphore. +*/ +void SDL_DestroySemaphore(SDL_sem *sem) +{ + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return; + } + + sem_destroy(&sem->sem); +} + +int SDL_SemTryWait(SDL_sem *sem) +{ + int retval; + + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + retval = sem_trywait(&sem->sem); + if (retval==0) return 0; + else return SDL_MUTEX_TIMEDOUT; + + return retval; +} + +int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) +{ + int retval; + + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + /* A timeout of 0 is an easy case */ + if ( timeout == 0 ) { + return SDL_SemTryWait(sem); + } + + retval = sem_wait_timed(&sem->sem,timeout); + if (retval==-1) retval= SDL_MUTEX_TIMEDOUT; + + return retval; +} + +int SDL_SemWait(SDL_sem *sem) +{ + int retval; + + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {} + return retval; +} + +Uint32 SDL_SemValue(SDL_sem *sem) +{ + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + return sem_count(&sem->sem); +} + +int SDL_SemPost(SDL_sem *sem) +{ + if ( ! sem ) { + SDL_SetError("Passed a NULL semaphore"); + return -1; + } + + sem_signal(&sem->sem); + return 0; +} + +#endif /* SDL_THREADS_DISABLED */ |