181 lines
3.6 KiB
C
181 lines
3.6 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1997-2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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*
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* File CMUTEX.C
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*
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* Modification History:
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*
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* Date Name Description
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* 04/02/97 aliu Creation.
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* 04/07/99 srl updated
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* 05/13/99 stephen Changed to umutex (from cmutex).
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* 11/22/99 aliu Make non-global mutex autoinitialize [j151]
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*******************************************************************************
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*/
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/* Assume POSIX, and modify as necessary below */
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#define POSIX
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#if defined(_WIN32)
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#undef POSIX
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#endif
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#if defined(macintosh)
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#undef POSIX
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#endif
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#if defined(OS2)
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#undef POSIX
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#endif
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/* Check our settings... */
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#include "unicode/utypes.h"
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/* APP_NO_THREADS is an old symbol. We'll honour it if present. */
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#ifdef APP_NO_THREADS
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# define ICU_USE_THREADS 0
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#endif
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/* Default: use threads. */
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#ifndef ICU_USE_THREADS
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# define ICU_USE_THREADS 1
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#endif
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#if defined(POSIX) && (ICU_USE_THREADS==1)
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/* Usage: uncomment the following, and breakpoint WeAreDeadlocked to
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find reentrant issues. */
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/* # define POSIX_DEBUG_REENTRANCY 1 */
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# include <pthread.h> /* must be first, so that we get the multithread versions of things. */
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# ifdef POSIX_DEBUG_REENTRANCY
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pthread_t gLastThread;
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UBool gInMutex;
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U_EXPORT void WeAreDeadlocked();
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void WeAreDeadlocked()
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{
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puts("ARGH!! We're deadlocked.. break on WeAreDeadlocked() next time.");
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}
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# endif /* POSIX_DEBUG_REENTRANCY */
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#endif /* POSIX && (ICU_USE_THREADS==1) */
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#ifdef _WIN32
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# include <WINDOWS.H>
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#endif
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#include "umutex.h"
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#include "cmemory.h"
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/* the global mutex. Use it proudly and wash it often. */
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UMTX gGlobalMutex = NULL;
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void umtx_lock( UMTX *mutex )
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{
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#if (ICU_USE_THREADS == 1)
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if( mutex == NULL )
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{
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mutex = &gGlobalMutex;
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}
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if(*mutex == NULL)
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{
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umtx_init(mutex);
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}
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#if defined(_WIN32)
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EnterCriticalSection((CRITICAL_SECTION*) *mutex);
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#elif defined(POSIX)
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# ifdef POSIX_DEBUG_REENTRANCY
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if(gInMutex == TRUE) /* in the mutex -- possible deadlock*/
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if(pthread_equal(gLastThread,pthread_self()))
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WeAreDeadlocked();
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# endif
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pthread_mutex_lock((pthread_mutex_t*) *mutex);
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# ifdef POSIX_DEBUG_REENTRANCY
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gLastThread = pthread_self();
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gInMutex = TRUE;
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# endif
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#endif
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#endif /* ICU_USE_THREADS==1 */
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}
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void umtx_unlock( UMTX* mutex )
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{
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#if (ICU_USE_THREADS==1)
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if( mutex == NULL )
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{
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mutex = &gGlobalMutex;
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if(*mutex == NULL)
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{
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return; /* jitterbug 135, fix for multiprocessor machines */
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}
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}
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#if defined(_WIN32)
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LeaveCriticalSection((CRITICAL_SECTION*)*mutex);
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#elif defined(POSIX)
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pthread_mutex_unlock((pthread_mutex_t*)*mutex);
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#ifdef POSIX_DEBUG_REENTRANCY
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gInMutex = FALSE;
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#endif
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#endif
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#endif /* ICU_USE_THREADS == 1 */
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}
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U_CAPI void umtx_init( UMTX *mutex )
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{
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#if (ICU_USE_THREADS == 1)
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if( mutex == NULL ) /* initialize the global mutex */
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{
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mutex = &gGlobalMutex;
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}
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if(*mutex != NULL) /* someone already did it. */
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return;
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#if defined( _WIN32 )
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*mutex = uprv_malloc(sizeof(CRITICAL_SECTION));
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InitializeCriticalSection((CRITICAL_SECTION*)*mutex);
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#elif defined( POSIX )
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*mutex = uprv_malloc(sizeof(pthread_mutex_t));
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#if defined(HPUX_CMA)
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pthread_mutex_init((pthread_mutex_t*)*mutex, pthread_mutexattr_default);
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#else
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pthread_mutex_init((pthread_mutex_t*)*mutex,NULL);
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#endif
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# ifdef POSIX_DEBUG_REENTRANCY
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gInMutex = FALSE;
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# endif
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#endif
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#endif /* ICU_USE_THREADS==1 */
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}
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