godot/drivers/unix/semaphore_posix.cpp

/*************************************************************************/
/*  semaphore_posix.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur.                 */
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#include "semaphore_posix.h"

#if defined(UNIX_ENABLED) || defined(PTHREAD_ENABLED)

#include "os/memory.h"
#include <errno.h>
#include <stdio.h>

Error SemaphorePosix::wait() {


	while(sem_wait(&sem)) {
		if (errno==EINTR) {
			errno=0;
			continue;
		} else {
perror("sem waiting");
			return ERR_BUSY;
		}
	}
	return OK;
}

Error SemaphorePosix::post() {

	return (sem_post(&sem)==0)?OK:ERR_BUSY; 
}
int SemaphorePosix::get() const {

	int val;
	sem_getvalue(&sem, &val);
	
	return val;	
}


Semaphore *SemaphorePosix::create_semaphore_posix() {

	return memnew( SemaphorePosix );
}

void SemaphorePosix::make_default() {

	create_func=create_semaphore_posix;
}

SemaphorePosix::SemaphorePosix() {

	int r = sem_init(&sem,0,0);
	if (r != 0)
		perror("sem creating");
}


SemaphorePosix::~SemaphorePosix() {

	sem_destroy(&sem);
}


#endif