364 lines
7.5 KiB
C
364 lines
7.5 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 1997-2001, 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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#include "uassert.h"
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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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# define WIN32_LEAN_AND_MEAN
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# define NOGDI
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# define NOUSER
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# define NOSERVICE
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# define NOIME
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# define NOMCX
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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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#if (ICU_USE_THREADS == 1)
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/* the global mutex. Use it proudly and wash it often. */
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static UMTX gGlobalMutex = NULL;
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static int32_t gRecursionCount; /* Detect Recursive entries. For debugging only. */
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#if defined(WIN32)
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static CRITICAL_SECTION gPlatformMutex;
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#elif defined(POSIX)
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static pthread_mutex_t gPlatformMutex;
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#endif
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#endif /* ICU_USE_THREADS==1 */
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U_CAPI UBool U_EXPORT2
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umtx_isInitialized(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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return (UBool)(*mutex != NULL);
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#else
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return TRUE; /* Since we don't use threads, it's considered initialized. */
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#endif /* ICU_USE_THREADS==1 */
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}
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U_CAPI void U_EXPORT2
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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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if (mutex != &gGlobalMutex) {umtx_lock(NULL);};
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if (*mutex == NULL) {
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umtx_init(mutex);
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}
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if (mutex != &gGlobalMutex) {umtx_unlock(NULL);};
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}
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#if defined(WIN32)
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EnterCriticalSection((CRITICAL_SECTION*) *mutex);
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#ifdef _DEBUG
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if (mutex == &gGlobalMutex) {
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gRecursionCount++;
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U_ASSERT(gRecursionCount == 1);
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}
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#endif /*_DEBUG*/
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#elif defined(POSIX)
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# ifdef POSIX_DEBUG_REENTRANCY
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if (gInMutex == TRUE && mutex == &gGlobalMutex) /* 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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if (mutex == &gGlobalMutex) {
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gLastThread = pthread_self();
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gInMutex = TRUE;
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}
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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 U_EXPORT2
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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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}
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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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#if defined (WIN32)
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#ifdef _DEBUG
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if (mutex == &gGlobalMutex) {
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gRecursionCount--;
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U_ASSERT(gRecursionCount == 0);
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}
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#endif /*_DEBUG*/
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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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if (mutex == &gGlobalMutex) {
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gInMutex = FALSE;
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}
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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 U_EXPORT2
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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 (*mutex == gGlobalMutex)
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{
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*mutex = &gPlatformMutex;
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}
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else
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{
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#if defined (WIN32)
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*mutex = uprv_malloc(sizeof(CRITICAL_SECTION));
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#elif defined( POSIX )
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*mutex = uprv_malloc(sizeof(pthread_mutex_t));
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#endif
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}
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#if defined (WIN32)
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InitializeCriticalSection((CRITICAL_SECTION*)*mutex);
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#elif defined (POSIX)
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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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U_CAPI void U_EXPORT2
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umtx_destroy(UMTX *mutex) {
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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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DeleteCriticalSection((CRITICAL_SECTION*)*mutex);
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#elif defined (POSIX)
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pthread_mutex_destroy((pthread_mutex_t*)*mutex);
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#endif
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if (*mutex != gGlobalMutex)
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{
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uprv_free(*mutex);
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}
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*mutex = NULL;
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#endif /* ICU_USE_THREADS==1 */
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}
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#if (ICU_USE_THREADS == 1)
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/*
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* umtx_atomic_inc
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* umtx_atomic_dec
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*/
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#if defined (WIN32)
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/*
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* Win32 - use the Windows API functions for atomic increment and decrement.
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*/
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_inc(int32_t *p)
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{
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return InterlockedIncrement(p);
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}
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_dec(int32_t *p)
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{
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return InterlockedDecrement(p);
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}
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#elif defined (POSIX)
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/*
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* POSIX platforms without specific atomic operations. Use a posix mutex
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* to protect the increment and decrement.
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* Put the mutex in static storage so we don't have to come back and delete it
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* when the process exits.
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*/
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static pthread_mutex_t gIncDecMutex;
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static UBool gIncDecMutexInitialized = FALSE;
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_inc(int32_t *p)
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{
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int32_t retVal;
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if (gIncDecMutexInitialized == FALSE) {
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umtx_lock(NULL);
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if (gIncDecMutexInitialized == FALSE) {
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# if defined (HPUX_CMA)
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pthread_mutex_init((pthread_mutex_t*)&gIncDecMutex, pthread_mutexattr_default);
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# else
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pthread_mutex_init((pthread_mutex_t*)&gIncDecMutex, NULL);
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gIncDecMutexInitialized = TRUE;
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}
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# endif
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umtx_unlock(NULL);
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}
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pthread_mutex_lock(&gIncDecMutex);
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retVal = ++(*p);
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pthread_mutex_unlock(&gIncDecMutex);
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return retVal;
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}
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_dec(int32_t *p)
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{
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int32_t retVal;
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pthread_mutex_lock(&gIncDecMutex);
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retVal = --(*p);
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pthread_mutex_unlock(&gIncDecMutex);
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return retVal;
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}
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/* TODO: pthread_mutex_destroy() when the time comes. */
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#else
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/* No recognized platform. */
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#warning No atomic increment and decrement defined for this platform.
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_inc(int32_t *p) {
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return ++(*p);
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}
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_dec(int32_t *p) {
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return --(*p);
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}
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#endif /* Platform selection for atomic_inc and dec. */
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#else /* (ICU_USE_THREADS == 1) */
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_inc(int32_t *p) {
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return ++(*p);
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}
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U_CAPI int32_t U_EXPORT2
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umtx_atomic_dec(int32_t *p) {
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return --(*p);
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}
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#endif /* (ICU_USE_THREADS == 1) */
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