/*****************************************************************************

Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA

*****************************************************************************/

/**************************************************//**
@file include/os0sync.ic
The interface to the operating system synchronization primitives.

Created 9/6/1995 Heikki Tuuri
*******************************************************/

#ifdef __WIN__
#include <winbase.h>
#endif

/**********************************************************//**
Acquires ownership of a fast mutex.
@return	0 if success, != 0 if was reserved by another thread */
UNIV_INLINE
ulint
os_fast_mutex_trylock(
/*==================*/
	os_fast_mutex_t*	fast_mutex)	/*!< in: mutex to acquire */
{
#ifdef __WIN__
	if (TryEnterCriticalSection(fast_mutex)) {

		return(0);
	} else {

		return(1);
	}
#else
	/* NOTE that the MySQL my_pthread.h redefines pthread_mutex_trylock
	so that it returns 0 on success. In the operating system
	libraries, HP-UX-10.20 follows the old Posix 1003.4a Draft 4 and
	returns 1 on success (but MySQL remaps that to 0), while Linux,
	FreeBSD, Solaris, AIX, Tru64 Unix, HP-UX-11.0 return 0 on success. */

	return((ulint) pthread_mutex_trylock(fast_mutex));
#endif
}