include/SDL_mutex.h
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#ifndef _SDL_mutex_h
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#define _SDL_mutex_h
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/* Functions to provide thread synchronization primitives
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	These are independent of the other SDL routines.
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*/
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#include "SDL_main.h"
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#include "SDL_types.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Synchronization functions which can time out return this value
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   if they time out.
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*/
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#define SDL_MUTEX_TIMEDOUT	1
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/* This is the timeout value which corresponds to never time out */
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#define SDL_MUTEX_MAXWAIT	(~(Uint32)0)
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* Mutex functions                                               */
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* The SDL mutex structure, defined in SDL_mutex.c */
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struct SDL_mutex;
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typedef struct SDL_mutex SDL_mutex;
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/* Create a mutex, initialized unlocked */
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extern DECLSPEC SDL_mutex * SDL_CreateMutex(void);
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/* Lock the mutex  (Returns 0, or -1 on error) */
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#define SDL_LockMutex(m)	SDL_mutexP(m)
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extern DECLSPEC int SDL_mutexP(SDL_mutex *mutex);
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/* Unlock the mutex  (Returns 0, or -1 on error) */
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#define SDL_UnlockMutex(m)	SDL_mutexV(m)
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extern DECLSPEC int SDL_mutexV(SDL_mutex *mutex);
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/* Destroy a mutex */
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extern DECLSPEC void SDL_DestroyMutex(SDL_mutex *mutex);
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* Semaphore functions                                           */
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* The SDL semaphore structure, defined in SDL_sem.c */
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struct SDL_semaphore;
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typedef struct SDL_semaphore SDL_sem;
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/* Create a semaphore, initialized with value, returns NULL on failure. */
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extern DECLSPEC SDL_sem * SDL_CreateSemaphore(Uint32 initial_value);
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/* Destroy a semaphore */
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extern DECLSPEC void SDL_DestroySemaphore(SDL_sem *sem);
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/* This function suspends the calling thread until the semaphore pointed 
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 * to by sem has a positive count. It then atomically decreases the semaphore
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 * count.
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 */
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extern DECLSPEC int SDL_SemWait(SDL_sem *sem);
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/* Non-blocking variant of SDL_SemWait(), returns 0 if the wait succeeds,
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   SDL_MUTEX_TIMEDOUT if the wait would block, and -1 on error.
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*/
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extern DECLSPEC int SDL_SemTryWait(SDL_sem *sem);
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/* Variant of SDL_SemWait() with a timeout in milliseconds, returns 0 if
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   the wait succeeds, SDL_MUTEX_TIMEDOUT if the wait does not succeed in
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   the allotted time, and -1 on error.
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   On some platforms this function is implemented by looping with a delay
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   of 1 ms, and so should be avoided if possible.
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*/
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extern DECLSPEC int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms);
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/* Atomically increases the semaphore's count (not blocking), returns 0,
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   or -1 on error.
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 */
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extern DECLSPEC int SDL_SemPost(SDL_sem *sem);
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/* Returns the current count of the semaphore */
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extern DECLSPEC Uint32 SDL_SemValue(SDL_sem *sem);
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* Condition variable functions                                  */
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* The SDL condition variable structure, defined in SDL_cond.c */
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struct SDL_cond;
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typedef struct SDL_cond SDL_cond;
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/* Create a condition variable */
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extern DECLSPEC SDL_cond * SDL_CreateCond(void);
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/* Destroy a condition variable */
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extern DECLSPEC void SDL_DestroyCond(SDL_cond *cond);
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/* Restart one of the threads that are waiting on the condition variable,
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   returns 0 or -1 on error.
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 */
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extern DECLSPEC int SDL_CondSignal(SDL_cond *cond);
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/* Restart all threads that are waiting on the condition variable,
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   returns 0 or -1 on error.
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 */
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extern DECLSPEC int SDL_CondBroadcast(SDL_cond *cond);
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/* Wait on the condition variable, unlocking the provided mutex.
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   The mutex must be locked before entering this function!
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   Returns 0 when it is signaled, or -1 on error.
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 */
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extern DECLSPEC int SDL_CondWait(SDL_cond *cond, SDL_mutex *mut);
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/* Waits for at most 'ms' milliseconds, and returns 0 if the condition
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   variable is signaled, SDL_MUTEX_TIMEDOUT if the condition is not
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   signaled in the allotted time, and -1 on error.
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   On some platforms this function is implemented by looping with a delay
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   of 1 ms, and so should be avoided if possible.
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*/
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extern DECLSPEC int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* _SDL_mutex_h */