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  • Committer: brian
  • Date: 2008-06-25 05:29:13 UTC
  • Revision ID: brian@localhost.localdomain-20080625052913-6upwo0jsrl4lnapl
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storage/innobase/include/os0sync.ic
 
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/******************************************************
 
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The interface to the operating system synchronization primitives.
 
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(c) 1995 Innobase Oy
 
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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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UNIV_INLINE
 
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ulint
 
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os_fast_mutex_trylock(
 
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/*==================*/
 
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                                                /* out: 0 if success, != 0 if
 
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                                                was reserved by another
 
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                                                thread */
 
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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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#if defined(UNIV_HOTBACKUP) && defined(UNIV_HPUX10)
 
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        /* Since the hot backup version is standalone, MySQL does not redefine
 
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        pthread_mutex_trylock for HP-UX-10.20, and consequently we must invert
 
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        the return value here */
 
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        return((ulint) (1 - pthread_mutex_trylock(fast_mutex)));
 
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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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#endif
 
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}