/*

 * libusb synchronization using POSIX Threads

 *

 * Copyright © 2011 Vitali Lovich <vlovich@aliph.com>

 * Copyright © 2011 Peter Stuge <peter@stuge.se>

 *

 * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <config.h>

#include <time.h>

#if defined(__linux__) || defined(__OpenBSD__)

# if defined(__OpenBSD__)

#  define _BSD_SOURCE

# endif

# include <unistd.h>

# include <sys/syscall.h>

#elif defined(__APPLE__)

# include <pthread.h>

#elif defined(__CYGWIN__)

# include <windows.h>

#endif

#include "threads_posix.h"

#include "libusbi.h"

int usbi_cond_timedwait(pthread_cond_t *cond,

	pthread_mutex_t *mutex, const struct timeval *tv)

{

	struct timespec timeout;

	int r;

	r = usbi_backend.clock_gettime(USBI_CLOCK_REALTIME, &timeout);

	if (r < 0)

		return r;

	timeout.tv_sec += tv->tv_sec;

	timeout.tv_nsec += tv->tv_usec * 1000;

	while (timeout.tv_nsec >= 1000000000L) {

		timeout.tv_nsec -= 1000000000L;

		timeout.tv_sec++;

	}

	return pthread_cond_timedwait(cond, mutex, &timeout);

}

int usbi_get_tid(void)

{

	int ret;

#if defined(__ANDROID__)

	ret = gettid();

#elif defined(__linux__)

	ret = syscall(SYS_gettid);

#elif defined(__OpenBSD__)

	/* The following only works with OpenBSD > 5.1 as it requires

	   real thread support. For 5.1 and earlier, -1 is returned. */

	ret = syscall(SYS_getthrid);

#elif defined(__APPLE__)

	ret = (int)pthread_mach_thread_np(pthread_self());

#elif defined(__CYGWIN__)

	ret = GetCurrentThreadId();

#else

	ret = -1;

#endif

/* TODO: NetBSD thread ID support */

	return ret;

}