/*******************************************************************/
/*  sltdl: a surrogate ltdl implementation                         */
/*  Copyright (C) 2019 Z. Gilboa                                   */
/*  Released under the Standard MIT License; see COPYING.SLTDL.    */
/*******************************************************************/

#include <limits.h>
#include <pthread.h>
#include <sltdl/sltdl.h>

static int             lt_refs = 0;
static pthread_mutex_t lt_lock = PTHREAD_MUTEX_INITIALIZER;

int lt_dlinit(void)
{
	if (pthread_mutex_lock(&lt_lock))
		return 1;

	lt_refs++;
	pthread_mutex_unlock(&lt_lock);

	return 0;
}

int lt_dlexit(void)
{
	if (pthread_mutex_lock(&lt_lock))
		return 1;

	if (!lt_refs) {
		pthread_mutex_unlock(&lt_lock);
		return 1;
	}

	lt_refs--;

	pthread_mutex_unlock(&lt_lock);

	return 0;
}

void lt_slock(void)
{
	int locked;

	do {
		locked = pthread_mutex_lock(&lt_lock);
	} while (locked);
}

int lt_sunlock(int ret)
{
	pthread_mutex_unlock(&lt_lock);
	return ret;
}