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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.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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
}
/**********************************************************//**
Acquires ownership of a fast mutex. Implies a full memory barrier even on
platforms such as PowerPC where this is not normally required.
@return 0 if success, != 0 if was reserved by another thread */
UNIV_INLINE
ulint
os_fast_mutex_trylock_full_barrier(
/*==================*/
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. */
#ifdef __powerpc__
os_mb;
#endif
return((ulint) pthread_mutex_trylock(fast_mutex));
#endif
}
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