view include/SDL_mutex.h @ 2079:1ed2155b7ee4

From: Torsten Giebl Subject: ALLOCA Patch for SDL-1.2 Newsgroups: gmane.comp.lib.sdl Date: 2006-10-24 00:31:16 GMT Hello ! As alloca.h is not available on CYGWIN and MinGW32 it should not be checked there or it should be checked with -mno-cygwin using. I am a total configure.in newbie, but i found the way that things are handled in configure.in pretty bad for the case CYGWIN with MinGW Mode or not. Maybe this is not possible but i would like to have a way to detect at the start for example CYGWIN and then add. ask if configure was called with --enable-cygwin for example. --enable-cygwin should be optional and disabled by default as we want to have MinGW Mode by default. Only if the user wants it he should be able to use it. Then the whole configure.in would get add. questions okay the system is CYGWIN with or without MinGW Mode. The alloca.h thing for example is only available under CYGWIN ( without MinGW Mode ). CU
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Dec 2006 20:25:03 +0000
parents c121d94672cb
children 99210400e8b9
line wrap: on
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/*
    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
*/

#ifndef _SDL_mutex_h
#define _SDL_mutex_h

/**
 * \file SDL_mutex.h
 *
 * Functions to provide thread synchronization primitives
 */

#include "SDL_stdinc.h"
#include "SDL_error.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#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)
   It is an error to unlock a mutex that has not been locked by
   the current thread, and doing so results in undefined behavior.
 */
#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!
   The mutex is re-locked once the condition variable is signaled.
   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
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"

#endif /* _SDL_mutex_h */

/* vi: set ts=4 sw=4 expandtab: */