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Viewing changes to plugin/innobase/include/os0sync.ic

  • Committer: Padraig O'Sullivan
  • Date: 2009-09-18 00:22:38 UTC
  • mto: This revision was merged to the branch mainline in revision 1139.
  • Revision ID: osullivan.padraig@gmail.com-20090918002238-zq7mui4r2yzoidz1
Extracted KeyUse into its own header file and placed it within the
drizzled::optimizer namespace.

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plugin/innobase/include/os0sync.ic
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/*****************************************************************************
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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., 51 Franklin
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St, Fifth Floor, Boston, MA 02110-1301 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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#include <pthread.h>
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/**********************************************************//**
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Acquires ownership of a fast mutex.
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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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        if (TryEnterCriticalSection(fast_mutex)) {
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                return(0);
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        } else {
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                return(1);
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        }
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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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}