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/*****************************************************************************
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
*****************************************************************************/
/******************************************************
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. Currently in Windows this is the same
as os_fast_mutex_lock! */
UNIV_INLINE
ulint
os_fast_mutex_trylock(
/*==================*/
/* out: 0 if success, != 0 if
was reserved by another
thread */
os_fast_mutex_t* fast_mutex) /* in: mutex to acquire */
{
#ifdef __WIN__
EnterCriticalSection(fast_mutex);
return(0);
#else
#if defined(UNIV_HOTBACKUP) && defined(UNIV_HPUX10)
/* Since the hot backup version is standalone, MySQL does not redefine
pthread_mutex_trylock for HP-UX-10.20, and consequently we must invert
the return value here */
return((ulint) (1 - pthread_mutex_trylock(fast_mutex)));
#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
#endif
}
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