forked from KolibriOS/kolibrios
164 lines
5.4 KiB
C
Executable File
164 lines
5.4 KiB
C
Executable File
/*
|
|
SDL - Simple DirectMedia Layer
|
|
Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
|
|
*/
|
|
|
|
#ifdef SAVE_RCSID
|
|
static char rcsid =
|
|
"@(#) $Id: SDL_mutex.h,v 1.2 2001/04/26 16:50:17 hercules 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 * SDL_CreateMutex(void);
|
|
|
|
/* Lock the mutex (Returns 0, or -1 on error) */
|
|
#define SDL_LockMutex(m) SDL_mutexP(m)
|
|
extern DECLSPEC int SDL_mutexP(SDL_mutex *mutex);
|
|
|
|
/* Unlock the mutex (Returns 0, or -1 on error) */
|
|
#define SDL_UnlockMutex(m) SDL_mutexV(m)
|
|
extern DECLSPEC int SDL_mutexV(SDL_mutex *mutex);
|
|
|
|
/* Destroy a mutex */
|
|
extern DECLSPEC void 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 * SDL_CreateSemaphore(Uint32 initial_value);
|
|
|
|
/* Destroy a semaphore */
|
|
extern DECLSPEC void 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 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 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 SDL_SemWaitTimeout(SDL_sem *sem, Uint32 ms);
|
|
|
|
/* Atomically increases the semaphore's count (not blocking), returns 0,
|
|
or -1 on error.
|
|
*/
|
|
extern DECLSPEC int SDL_SemPost(SDL_sem *sem);
|
|
|
|
/* Returns the current count of the semaphore */
|
|
extern DECLSPEC Uint32 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 * SDL_CreateCond(void);
|
|
|
|
/* Destroy a condition variable */
|
|
extern DECLSPEC void 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 SDL_CondSignal(SDL_cond *cond);
|
|
|
|
/* Restart all threads that are waiting on the condition variable,
|
|
returns 0 or -1 on error.
|
|
*/
|
|
extern DECLSPEC int 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 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 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 */
|