/*+
−
 *	GNU pth conditions variables+
−
 *+
−
 *	Patrice Mandin+
−
 */+
−
+
−
#include <stdio.h>+
−
#include <stdlib.h>+
−
#include <pth.h>+
−
+
−
#include "SDL_error.h"+
−
#include "SDL_thread.h"+
−
#include "SDL_syscond_c.h"+
−
#include "SDL_sysmutex_c.h"+
−
+
−
/* Create a condition variable */+
−
SDL_cond * SDL_CreateCond(void)+
−
{+
−
	SDL_cond *cond;+
−
+
−
	cond = (SDL_cond *) malloc(sizeof(SDL_cond));+
−
	if ( cond ) {+
−
		if ( pth_cond_init(&(cond->condpth_p)) < 0 ) {+
−
			SDL_SetError("pthread_cond_init() failed");+
−
			free(cond);+
−
			cond = NULL;+
−
		}+
−
	} else {+
−
		SDL_OutOfMemory();+
−
	}+
−
	return(cond);+
−
}+
−
+
−
/* Destroy a condition variable */+
−
void SDL_DestroyCond(SDL_cond *cond)+
−
{+
−
	if ( cond ) {+
−
		free(cond);+
−
	}+
−
}+
−
+
−
/* Restart one of the threads that are waiting on the condition variable */+
−
int SDL_CondSignal(SDL_cond *cond)+
−
{+
−
	int retval;+
−
+
−
	if ( ! cond ) {+
−
		SDL_SetError("Passed a NULL condition variable");+
−
		return -1;+
−
	}+
−
+
−
	retval = 0;+
−
	if ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) {+
−
		SDL_SetError("pth_cond_notify() failed");+
−
		retval = -1;+
−
	}+
−
	return retval;+
−
}+
−
+
−
/* Restart all threads that are waiting on the condition variable */+
−
int SDL_CondBroadcast(SDL_cond *cond)+
−
{+
−
	int retval;+
−
+
−
	if ( ! cond ) {+
−
		SDL_SetError("Passed a NULL condition variable");+
−
		return -1;+
−
	}+
−
+
−
	retval = 0;+
−
	if ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) {+
−
		SDL_SetError("pth_cond_notify() failed");+
−
		retval = -1;+
−
	}+
−
	return retval;+
−
}+
−
+
−
/* 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);+
−
 */+
−
int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)+
−
{+
−
	int retval;+
−
	pth_event_t ev;+
−
	int sec;+
−
+
−
	if ( ! cond ) {+
−
		SDL_SetError("Passed a NULL condition variable");+
−
		return -1;+
−
	}+
−
+
−
	retval = 0;+
−
+
−
	sec = ms/1000;+
−
	ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000));+
−
+
−
	if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) {+
−
		SDL_SetError("pth_cond_await() failed");+
−
		retval = -1;+
−
	}+
−
+
−
    pth_event_free(ev, PTH_FREE_ALL);+
−
+
−
	return retval;+
−
}+
−
+
−
/* Wait on the condition variable forever */+
−
int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)+
−
{+
−
	int retval;+
−
+
−
	if ( ! cond ) {+
−
		SDL_SetError("Passed a NULL condition variable");+
−
		return -1;+
−
	}+
−
+
−
	retval = 0;+
−
	if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) {+
−
		SDL_SetError("pth_cond_await() failed");+
−
		retval = -1;+
−
	}+
−
	return retval;+
−
}+
−