SDL_mutex.h
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上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:6k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_mutex.h,v 1.4 2002/04/22 21:38:01 wmay Exp $";
- #endif
- #ifndef _SDL_mutex_h
- #define _SDL_mutex_h
- /* Functions to provide thread synchronization primitives
- These are independent of the other SDL routines.
- */
- #include "SDL_main.h"
- #include "SDL_types.h"
- #include "begin_code.h"
- /* Set up for C function definitions, even when using C++ */
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* Synchronization functions which can time out return this value
- if they time out.
- */
- #define SDL_MUTEX_TIMEDOUT 1
- /* This is the timeout value which corresponds to never time out */
- #define SDL_MUTEX_MAXWAIT (~(Uint32)0)
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* Mutex functions */
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* The SDL mutex structure, defined in SDL_mutex.c */
- struct SDL_mutex;
- typedef struct SDL_mutex SDL_mutex;
- /* Create a mutex, initialized unlocked */
- extern DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void);
- /* Lock the mutex (Returns 0, or -1 on error) */
- #define SDL_LockMutex(m) SDL_mutexP(m)
- extern DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex);
- /* Unlock the mutex (Returns 0, or -1 on error) */
- #define SDL_UnlockMutex(m) SDL_mutexV(m)
- extern DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex);
- /* Destroy a mutex */
- extern DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex);
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* Semaphore functions */
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* The SDL semaphore structure, defined in SDL_sem.c */
- struct SDL_semaphore;
- typedef struct SDL_semaphore SDL_sem;
- /* Create a semaphore, initialized with value, returns NULL on failure. */
- extern DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value);
- /* Destroy a semaphore */
- extern DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem);
- /* This function suspends the calling thread until the semaphore pointed
- * to by sem has a positive count. It then atomically decreases the semaphore
- * count.
- */
- extern DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem);
- /* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds,
- SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error.
- */
- extern DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem);
- /* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if
- the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in
- the allotted time, and -1 on error.
- On some platforms this function is implemented by looping with a delay
- of 1 ms, and so should be avoided if possible.
- */
- extern DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms);
- /* Atomically increases the semaphore's count (not blocking), returns 0,
- or -1 on error.
- */
- extern DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem);
- /* Returns the current count of the semaphore */
- extern DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem);
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* Condition variable functions */
- /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
- /* The SDL condition variable structure, defined in SDL_cond.c */
- struct SDL_cond;
- typedef struct SDL_cond SDL_cond;
- /* Create a condition variable */
- extern DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void);
- /* Destroy a condition variable */
- extern DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond);
- /* Restart one of the threads that are waiting on the condition variable,
- returns 0 or -1 on error.
- */
- extern DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond);
- /* Restart all threads that are waiting on the condition variable,
- returns 0 or -1 on error.
- */
- extern DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond);
- /* Wait on the condition variable, unlocking the provided mutex.
- The mutex must be locked before entering this function!
- Returns 0 when it is signaled, or -1 on error.
- */
- extern DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mut);
- /* Waits for at most 'ms' milliseconds, and returns 0 if the condition
- variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not
- signaled in the allotted time, and -1 on error.
- On some platforms this function is implemented by looping with a delay
- of 1 ms, and so should be avoided if possible.
- */
- extern DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms);
- /* Ends C function definitions when using C++ */
- #ifdef __cplusplus
- }
- #endif
- #include "close_code.h"
- #endif /* _SDL_mutex_h */