/*
 * The MIT License
 *
 * Copyright (C) 2017 Alexander Saprykin <saprykin.spb@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * 'Software'), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "pmem.h"
#include "pmutex.h"

#include <stdlib.h>

#include <exec/exectags.h>
#include <proto/exec.h>

typedef APTR mutex_hdl;

struct PMutex_ {
	mutex_hdl	hdl;
};

P_LIB_API PMutex *
p_mutex_new (void)
{
	PMutex *ret;

	if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PMutex))) == NULL)) {
		P_ERROR ("PMutex::p_mutex_new: failed to allocate memory");
		return NULL;
	}

	ret->hdl = IExec->AllocSysObjectTags (ASOT_MUTEX, ASOMUTEX_Recursive, TRUE, TAG_END);

	if (P_UNLIKELY (ret->hdl == NULL)) {
		P_ERROR ("PMutex::p_mutex_new: AllocSysObjectTags() failed");
		p_free (ret);
		return NULL;
	}

	return ret;
}

P_LIB_API pboolean
p_mutex_lock (PMutex *mutex)
{
	if (P_UNLIKELY (mutex == NULL))
		return FALSE;

	IExec->MutexObtain (mutex->hdl);

	return TRUE;
}

P_LIB_API pboolean
p_mutex_trylock (PMutex *mutex)
{
	if (P_UNLIKELY (mutex == NULL))
		return FALSE;

	return IExec->MutexAttempt (mutex->hdl);
}

P_LIB_API pboolean
p_mutex_unlock (PMutex *mutex)
{
	if (P_UNLIKELY (mutex == NULL))
		return FALSE;

	IExec->MutexRelease (mutex->hdl);

	return TRUE;
}

P_LIB_API void
p_mutex_free (PMutex *mutex)
{
	if (P_UNLIKELY (mutex == NULL))
		return;

	IExec->FreeSysObject (ASOT_MUTEX, mutex->hdl);

	p_free (mutex);
}