/*

    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 condition variables using semaphores and mutexes */

/*

   This implementation borrows heavily from the BeOS condition variable

   implementation, written by Christopher Tate and Owen Smith.  Thanks!

 */

#include "SDL_thread.h"

struct SDL_cond

{

	SDL_mutex *lock;

	int waiting;

	int signals;

	SDL_sem *wait_sem;

	SDL_sem *wait_done;

};

/* Create a condition variable */

DECLSPEC SDL_cond * SDLCALL SDL_CreateCond(void)

{

	SDL_cond *cond;

	cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));

	if ( cond ) {

		cond->lock = SDL_CreateMutex();

		cond->wait_sem = SDL_CreateSemaphore(0);

		cond->wait_done = SDL_CreateSemaphore(0);

		cond->waiting = cond->signals = 0;

		if ( ! cond->lock || ! cond->wait_sem || ! cond->wait_done ) {

			SDL_DestroyCond(cond);

			cond = NULL;

		}

	} else {

		SDL_OutOfMemory();

	}

	return(cond);

}

/* Destroy a condition variable */

DECLSPEC void SDLCALL SDL_DestroyCond(SDL_cond *cond)

{

	if ( cond ) {

		if ( cond->wait_sem ) {

			SDL_DestroySemaphore(cond->wait_sem);

		}

		if ( cond->wait_done ) {

			SDL_DestroySemaphore(cond->wait_done);

		}

		if ( cond->lock ) {

			SDL_DestroyMutex(cond->lock);

		}

		SDL_free(cond);

	}

}

/* Restart one of the threads that are waiting on the condition variable */

DECLSPEC int SDLCALL SDL_CondSignal(SDL_cond *cond)

{

	if ( ! cond ) {

		SDL_SetError("Passed a NULL condition variable");

		return -1;

	}

	/* If there are waiting threads not already signalled, then

	   signal the condition and wait for the thread to respond.

	*/

	SDL_LockMutex(cond->lock);

	if ( cond->waiting > cond->signals ) {

		++cond->signals;

		SDL_SemPost(cond->wait_sem);

		SDL_UnlockMutex(cond->lock);

		SDL_SemWait(cond->wait_done);

	} else {

		SDL_UnlockMutex(cond->lock);

	}

	return 0;

}

/* Restart all threads that are waiting on the condition variable */

DECLSPEC int SDLCALL SDL_CondBroadcast(SDL_cond *cond)

{

	if ( ! cond ) {

		SDL_SetError("Passed a NULL condition variable");

		return -1;

	}

	/* If there are waiting threads not already signalled, then

	   signal the condition and wait for the thread to respond.

	*/

	SDL_LockMutex(cond->lock);

	if ( cond->waiting > cond->signals ) {

		int i, num_waiting;

		num_waiting = (cond->waiting - cond->signals);

		cond->signals = cond->waiting;

		for ( i=0; i<num_waiting; ++i ) {

			SDL_SemPost(cond->wait_sem);

		}

		/* Now all released threads are blocked here, waiting for us.

		   Collect them all (and win fabulous prizes!) :-)

		 */

		SDL_UnlockMutex(cond->lock);

		for ( i=0; i<num_waiting; ++i ) {

			SDL_SemWait(cond->wait_done);

		}

	} else {

		SDL_UnlockMutex(cond->lock);

	}

	return 0;

}

/* Wait on the condition variable for at most 'ms' milliseconds.

   The mutex must be locked before entering this function!

   The mutex is unlocked during the wait, and locked again after the wait.

Typical use:

Thread A:

	SDL_LockMutex(lock);

	while ( ! condition ) {

		SDL_CondWait(cond);

	}

	SDL_UnlockMutex(lock);

Thread B:

	SDL_LockMutex(lock);

	...

	condition = true;

	...

	SDL_UnlockMutex(lock);

 */

DECLSPEC int SDLCALL SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)

{

	int retval;

	if ( ! cond ) {

		SDL_SetError("Passed a NULL condition variable");

		return -1;

	}

	/* Obtain the protection mutex, and increment the number of waiters.

	   This allows the signal mechanism to only perform a signal if there

	   are waiting threads.

	 */

	SDL_LockMutex(cond->lock);

	++cond->waiting;

	SDL_UnlockMutex(cond->lock);

	/* Unlock the mutex, as is required by condition variable semantics */

	SDL_UnlockMutex(mutex);

	/* Wait for a signal */

	if ( ms == SDL_MUTEX_MAXWAIT ) {

		retval = SDL_SemWait(cond->wait_sem);

	} else {

		retval = SDL_SemWaitTimeout(cond->wait_sem, ms);

	}

	/* Let the signaler know we have completed the wait, otherwise

           the signaler can race ahead and get the condition semaphore

           if we are stopped between the mutex unlock and semaphore wait,

           giving a deadlock.  See the following URL for details:

        http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html

	*/

	SDL_LockMutex(cond->lock);

	if ( cond->signals > 0 ) {

		/* If we timed out, we need to eat a condition signal */

		if ( retval > 0 ) {

			SDL_SemWait(cond->wait_sem);

		}

		/* We always notify the signal thread that we are done */

		SDL_SemPost(cond->wait_done);

		/* Signal handshake complete */

		--cond->signals;

	}

	--cond->waiting;

	SDL_UnlockMutex(cond->lock);

	/* Lock the mutex, as is required by condition variable semantics */

	SDL_LockMutex(mutex);

	return retval;

}

/* Wait on the condition variable forever */

DECLSPEC int SDLCALL SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)

{

	return SDL_CondWaitTimeout(cond, mutex, SDL_MUTEX_MAXWAIT);

}