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3c6d991778
(followup to r4145) Non-functional change: Change the os_atomic_increment() and os_compare_and_swap() functions to macros to avoid artificial limitations on the types of those functions' arguments. As a consequence typecasts from the source code can be removed. Also remove Google's copyright from os0sync.ic because that file no longer contains code from Google. Approved by: Marko (rb://88), also ok from Inaam via IM
46 lines
1.4 KiB
Text
46 lines
1.4 KiB
Text
/******************************************************
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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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}
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