337 lines
6.8 KiB
C
337 lines
6.8 KiB
C
/*
|
|
******************************************************************************
|
|
*
|
|
* Copyright (C) 1997-2001, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
*
|
|
******************************************************************************
|
|
*
|
|
* File CMUTEX.C
|
|
*
|
|
* Modification History:
|
|
*
|
|
* Date Name Description
|
|
* 04/02/97 aliu Creation.
|
|
* 04/07/99 srl updated
|
|
* 05/13/99 stephen Changed to umutex (from cmutex).
|
|
* 11/22/99 aliu Make non-global mutex autoinitialize [j151]
|
|
******************************************************************************
|
|
*/
|
|
|
|
/* Assume POSIX, and modify as necessary below */
|
|
#define POSIX
|
|
|
|
#if defined(_WIN32)
|
|
#undef POSIX
|
|
#endif
|
|
#if defined(macintosh)
|
|
#undef POSIX
|
|
#endif
|
|
#if defined(OS2)
|
|
#undef POSIX
|
|
#endif
|
|
|
|
|
|
/* Check our settings... */
|
|
#include "unicode/utypes.h"
|
|
|
|
|
|
#if defined(POSIX) && (ICU_USE_THREADS==1)
|
|
/* Usage: uncomment the following, and breakpoint WeAreDeadlocked to
|
|
find reentrant issues. */
|
|
/* # define POSIX_DEBUG_REENTRANCY 1 */
|
|
# include <pthread.h> /* must be first, so that we get the multithread versions of things. */
|
|
|
|
# ifdef POSIX_DEBUG_REENTRANCY
|
|
pthread_t gLastThread;
|
|
UBool gInMutex;
|
|
|
|
U_EXPORT void WeAreDeadlocked();
|
|
|
|
void WeAreDeadlocked()
|
|
{
|
|
puts("ARGH!! We're deadlocked.. break on WeAreDeadlocked() next time.");
|
|
}
|
|
# endif /* POSIX_DEBUG_REENTRANCY */
|
|
#endif /* POSIX && (ICU_USE_THREADS==1) */
|
|
|
|
#ifdef WIN32
|
|
# define WIN32_LEAN_AND_MEAN
|
|
# define NOGDI
|
|
# define NOUSER
|
|
# define NOSERVICE
|
|
# define NOIME
|
|
# define NOMCX
|
|
# include <windows.h>
|
|
#endif
|
|
|
|
#include "umutex.h"
|
|
#include "cmemory.h"
|
|
|
|
#if (ICU_USE_THREADS == 1)
|
|
|
|
/* the global mutex. Use it proudly and wash it often. */
|
|
static UMTX gGlobalMutex = NULL;
|
|
|
|
#if defined(WIN32)
|
|
static CRITICAL_SECTION gPlatformMutex;
|
|
|
|
#elif defined(POSIX)
|
|
static pthread_mutex_t gPlatformMutex;
|
|
|
|
#endif
|
|
#endif /* ICU_USE_THREADS==1 */
|
|
|
|
U_CAPI void U_EXPORT2
|
|
umtx_lock(UMTX *mutex)
|
|
{
|
|
#if (ICU_USE_THREADS == 1)
|
|
if (mutex == NULL)
|
|
{
|
|
mutex = &gGlobalMutex;
|
|
}
|
|
|
|
if (*mutex == NULL)
|
|
{
|
|
if (mutex != &gGlobalMutex) {umtx_lock(NULL);};
|
|
if (*mutex == NULL) {
|
|
umtx_init(mutex);
|
|
}
|
|
if (mutex != &gGlobalMutex) {umtx_unlock(NULL);};
|
|
}
|
|
|
|
#if defined(WIN32)
|
|
|
|
EnterCriticalSection((CRITICAL_SECTION*) *mutex);
|
|
|
|
#elif defined(POSIX)
|
|
|
|
# ifdef POSIX_DEBUG_REENTRANCY
|
|
if (gInMutex == TRUE && mutex == &gGlobalMutex) /* in the mutex -- possible deadlock*/
|
|
if(pthread_equal(gLastThread, pthread_self()))
|
|
WeAreDeadlocked();
|
|
# endif
|
|
pthread_mutex_lock((pthread_mutex_t*) *mutex);
|
|
|
|
# ifdef POSIX_DEBUG_REENTRANCY
|
|
if (mutex == &gGlobalMutex) {
|
|
gLastThread = pthread_self();
|
|
gInMutex = TRUE;
|
|
}
|
|
# endif
|
|
#endif
|
|
#endif /* ICU_USE_THREADS==1 */
|
|
}
|
|
|
|
U_CAPI void U_EXPORT2
|
|
umtx_unlock(UMTX* mutex)
|
|
{
|
|
#if (ICU_USE_THREADS==1)
|
|
if(mutex == NULL)
|
|
{
|
|
mutex = &gGlobalMutex;
|
|
}
|
|
|
|
if(*mutex == NULL)
|
|
{
|
|
return; /* jitterbug 135, fix for multiprocessor machines */
|
|
}
|
|
|
|
#if defined (WIN32)
|
|
LeaveCriticalSection((CRITICAL_SECTION*)*mutex);
|
|
|
|
#elif defined (POSIX)
|
|
pthread_mutex_unlock((pthread_mutex_t*)*mutex);
|
|
|
|
#ifdef POSIX_DEBUG_REENTRANCY
|
|
if (mutex == &gGlobalMutex) {
|
|
gInMutex = FALSE;
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
#endif /* ICU_USE_THREADS == 1 */
|
|
}
|
|
|
|
U_CAPI void U_EXPORT2
|
|
umtx_init(UMTX *mutex)
|
|
{
|
|
#if (ICU_USE_THREADS == 1)
|
|
|
|
if (mutex == NULL) /* initialize the global mutex */
|
|
{
|
|
mutex = &gGlobalMutex;
|
|
}
|
|
|
|
if (*mutex != NULL) /* someone already did it. */
|
|
return;
|
|
|
|
if (*mutex == gGlobalMutex)
|
|
{
|
|
*mutex = &gPlatformMutex;
|
|
}
|
|
else
|
|
{
|
|
#if defined (WIN32)
|
|
*mutex = uprv_malloc(sizeof(CRITICAL_SECTION));
|
|
#elif defined( POSIX )
|
|
*mutex = uprv_malloc(sizeof(pthread_mutex_t));
|
|
#endif
|
|
}
|
|
|
|
#if defined (WIN32)
|
|
InitializeCriticalSection((CRITICAL_SECTION*)*mutex);
|
|
|
|
#elif defined (POSIX)
|
|
# if defined (HPUX_CMA)
|
|
pthread_mutex_init((pthread_mutex_t*)*mutex, pthread_mutexattr_default);
|
|
# else
|
|
pthread_mutex_init((pthread_mutex_t*)*mutex, NULL);
|
|
# endif
|
|
|
|
# ifdef POSIX_DEBUG_REENTRANCY
|
|
gInMutex = FALSE;
|
|
# endif
|
|
|
|
#endif
|
|
#endif /* ICU_USE_THREADS==1 */
|
|
}
|
|
|
|
U_CAPI void U_EXPORT2
|
|
umtx_destroy(UMTX *mutex) {
|
|
#if (ICU_USE_THREADS == 1)
|
|
if (mutex == NULL) /* initialize the global mutex */
|
|
{
|
|
mutex = &gGlobalMutex;
|
|
}
|
|
|
|
if (*mutex == NULL) /* someone already did it. */
|
|
return;
|
|
|
|
#if defined (WIN32)
|
|
DeleteCriticalSection((CRITICAL_SECTION*)*mutex);
|
|
|
|
#elif defined (POSIX)
|
|
pthread_mutex_destroy((pthread_mutex_t*)*mutex);
|
|
|
|
#endif
|
|
|
|
if (*mutex != gGlobalMutex)
|
|
{
|
|
uprv_free(*mutex);
|
|
}
|
|
|
|
*mutex = NULL;
|
|
#endif /* ICU_USE_THREADS==1 */
|
|
}
|
|
|
|
|
|
#if (ICU_USE_THREADS == 1)
|
|
|
|
|
|
/*
|
|
* umtx_atomic_inc
|
|
* umtx_atomic_dec
|
|
*/
|
|
|
|
#if defined (WIN32)
|
|
/*
|
|
* Win32 - use the Windows API functions for atomic increment and decrement.
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_inc(int32_t *p)
|
|
{
|
|
return InterlockedIncrement(p);
|
|
}
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_dec(int32_t *p)
|
|
{
|
|
return InterlockedDecrement(p);
|
|
}
|
|
|
|
#elif defined (POSIX)
|
|
/*
|
|
* POSIX platforms without specific atomic operations. Use a posix mutex
|
|
* to protect the increment and decrement.
|
|
* Put the mutex in static storage so we don't have to come back and delete it
|
|
* when the process exits.
|
|
*/
|
|
static pthread_mutex_t gIncDecMutex;
|
|
static UBool gIncDecMutexInitialized = FALSE;
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_inc(int32_t *p)
|
|
{
|
|
int32_t retVal;
|
|
|
|
if (gIncDecMutexInitialized == FALSE) {
|
|
umtx_lock(NULL);
|
|
if (gIncDecMutexInitialized == FALSE) {
|
|
# if defined (HPUX_CMA)
|
|
pthread_mutex_init((pthread_mutex_t*)&gIncDecMutex, pthread_mutexattr_default);
|
|
# else
|
|
pthread_mutex_init((pthread_mutex_t*)&gIncDecMutex, NULL);
|
|
gIncDecMutexInitialized = TRUE;
|
|
}
|
|
# endif
|
|
umtx_unlock(NULL);
|
|
}
|
|
|
|
|
|
pthread_mutex_lock(&gIncDecMutex);
|
|
retVal = ++(*p);
|
|
pthread_mutex_unlock(&gIncDecMutex);
|
|
return retVal;
|
|
}
|
|
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_dec(int32_t *p)
|
|
{
|
|
int32_t retVal;
|
|
|
|
pthread_mutex_lock(&gIncDecMutex);
|
|
retVal = --(*p);
|
|
pthread_mutex_unlock(&gIncDecMutex);
|
|
return retVal;
|
|
}
|
|
|
|
/* TODO: pthread_mutex_destroy() when the time comes. */
|
|
|
|
#else
|
|
|
|
/* No recognized platform. */
|
|
#warning No atomic increment and decrement defined for this platform.
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_inc(int32_t *p) {
|
|
return ++(*p);
|
|
}
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_dec(int32_t *p) {
|
|
return --(*p);
|
|
}
|
|
|
|
#endif /* Platform selection for atomic_inc and dec. */
|
|
|
|
|
|
#elif /* (ICU_USE_THREADS == 1) */
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_inc(int32_t *p) {
|
|
return ++(*p);
|
|
}
|
|
|
|
U_CAPI int32_t U_EXPORT2
|
|
umtx_atomic_dec(int32_t *p) {
|
|
return --(*p);
|
|
}
|
|
|
|
#endif /* (ICU_USE_THREADS == 1) */
|
|
|
|
|
|
|
|
|