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/*********************************
comments to Doxygen /** style like this:
/*****************************//**
This conversion was performed by the following command:
perl -i -e 'while(<ARGV>){if (m|^/\*{30}\**$|) {
s|\*{4}$|//**| if ++$com>1; $_ .= "\@file $ARGV\n" if $com==2}
print; if(eof){$.=0;undef $com}}' */*[ch] include/univ.i
53 lines
1.9 KiB
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53 lines
1.9 KiB
Text
/*****************************************************************************
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Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/os0sync.ic
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The interface to the operating system synchronization primitives.
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Created 9/6/1995 Heikki Tuuri
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*******************************************************/
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#ifdef __WIN__
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#include <winbase.h>
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#endif
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/**********************************************************//**
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Acquires ownership of a fast mutex. Currently in Windows this is the same
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as os_fast_mutex_lock!
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@return 0 if success, != 0 if was reserved by another thread */
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UNIV_INLINE
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ulint
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os_fast_mutex_trylock(
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/*==================*/
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os_fast_mutex_t* fast_mutex) /*!< in: mutex to acquire */
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{
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#ifdef __WIN__
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EnterCriticalSection(fast_mutex);
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return(0);
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#else
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/* NOTE that the MySQL my_pthread.h redefines pthread_mutex_trylock
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so that it returns 0 on success. In the operating system
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libraries, HP-UX-10.20 follows the old Posix 1003.4a Draft 4 and
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returns 1 on success (but MySQL remaps that to 0), while Linux,
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FreeBSD, Solaris, AIX, Tru64 Unix, HP-UX-11.0 return 0 on success. */
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return((ulint) pthread_mutex_trylock(fast_mutex));
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#endif
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}
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