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

  • Committer: Monty Taylor
  • Date: 2008-10-27 23:19:48 UTC
  • mto: (520.4.12 merge-innodb-plugin)
  • mto: This revision was merged to the branch mainline in revision 563.
  • Revision ID: monty@inaugust.com-20081027231948-3kl6ss04plbakqcr
Split some more things out of common_includes.h.

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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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}