diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/thread/generic/SDL_syssem.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/thread/generic/SDL_syssem.c | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/distrib/sdl-1.2.12/src/thread/generic/SDL_syssem.c b/distrib/sdl-1.2.12/src/thread/generic/SDL_syssem.c deleted file mode 100644 index c3ffd3f..0000000 --- a/distrib/sdl-1.2.12/src/thread/generic/SDL_syssem.c +++ /dev/null @@ -1,209 +0,0 @@ -/* - SDL - Simple DirectMedia Layer - Copyright (C) 1997-2006 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 "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 - -struct SDL_semaphore -{ - Uint32 count; - Uint32 waiters_count; - SDL_mutex *count_lock; - SDL_cond *count_nonzero; -}; - -SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) -{ - SDL_sem *sem; - - sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); - if ( ! sem ) { - SDL_OutOfMemory(); - return NULL; - } - sem->count = initial_value; - sem->waiters_count = 0; - - sem->count_lock = SDL_CreateMutex(); - sem->count_nonzero = SDL_CreateCond(); - if ( ! sem->count_lock || ! sem->count_nonzero ) { - SDL_DestroySemaphore(sem); - return NULL; - } - - return sem; -} - -/* WARNING: - You cannot call this function when another thread is using the semaphore. -*/ -void SDL_DestroySemaphore(SDL_sem *sem) -{ - if ( sem ) { - sem->count = 0xFFFFFFFF; - while ( sem->waiters_count > 0) { - SDL_CondSignal(sem->count_nonzero); - SDL_Delay(10); - } - SDL_DestroyCond(sem->count_nonzero); - if ( sem->count_lock ) { - SDL_mutexP(sem->count_lock); - SDL_mutexV(sem->count_lock); - SDL_DestroyMutex(sem->count_lock); - } - SDL_free(sem); - } -} - -int SDL_SemTryWait(SDL_sem *sem) -{ - int retval; - - if ( ! sem ) { - SDL_SetError("Passed a NULL semaphore"); - return -1; - } - - retval = SDL_MUTEX_TIMEDOUT; - SDL_LockMutex(sem->count_lock); - if ( sem->count > 0 ) { - --sem->count; - retval = 0; - } - SDL_UnlockMutex(sem->count_lock); - - 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); - } - - SDL_LockMutex(sem->count_lock); - ++sem->waiters_count; - retval = 0; - while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) { - retval = SDL_CondWaitTimeout(sem->count_nonzero, - sem->count_lock, timeout); - } - --sem->waiters_count; - --sem->count; - SDL_UnlockMutex(sem->count_lock); - - return retval; -} - -int SDL_SemWait(SDL_sem *sem) -{ - return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); -} - -Uint32 SDL_SemValue(SDL_sem *sem) -{ - Uint32 value; - - value = 0; - if ( sem ) { - SDL_LockMutex(sem->count_lock); - value = sem->count; - SDL_UnlockMutex(sem->count_lock); - } - return value; -} - -int SDL_SemPost(SDL_sem *sem) -{ - if ( ! sem ) { - SDL_SetError("Passed a NULL semaphore"); - return -1; - } - - SDL_LockMutex(sem->count_lock); - if ( sem->waiters_count > 0 ) { - SDL_CondSignal(sem->count_nonzero); - } - ++sem->count; - SDL_UnlockMutex(sem->count_lock); - - return 0; -} - -#endif /* SDL_THREADS_DISABLED */ |