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mutex.h
/*
Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization
dedicated to making software imaging solutions freely available.
You may not use this file except in compliance with the License. You may
obtain a copy of the License at
https://imagemagick.org/license/
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
MagickCore methods to synchronize code within a translation unit.
*/
#ifndef MAGICKCORE_MUTEX_H
#define MAGICKCORE_MUTEX_H
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
/*
When included in a translation unit, the following code provides the
translation unit a means by which to synchronize multiple threads that might
try to enter the same critical section or to access a shared resource; it can
be included in multiple translation units, and thereby provide a separate,
independent means of synchronization to each such translation unit.
*/
#if defined(MAGICKCORE_OPENMP_SUPPORT)
static MagickBooleanType
translation_unit_initialized = MagickFalse;
static omp_lock_t
translation_unit_mutex;
#elif defined(MAGICKCORE_THREAD_SUPPORT)
static pthread_mutex_t
translation_unit_mutex = PTHREAD_MUTEX_INITIALIZER;
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
static LONG
translation_unit_mutex = 0;
#endif
static inline void DestroyMagickMutex(void)
{
#if defined(MAGICKCORE_OPENMP_SUPPORT)
if (translation_unit_initialized != MagickFalse)
omp_destroy_lock(&translation_unit_mutex);
translation_unit_initialized=MagickFalse;
#endif
}
static inline void InitializeMagickMutex(void)
{
#if defined(MAGICKCORE_OPENMP_SUPPORT)
if (translation_unit_initialized == MagickFalse)
omp_init_lock(&translation_unit_mutex);
translation_unit_initialized=MagickTrue;
#endif
}
static inline void LockMagickMutex(void)
{
#if defined(MAGICKCORE_OPENMP_SUPPORT)
if (translation_unit_initialized == MagickFalse)
InitializeMagickMutex();
omp_set_lock(&translation_unit_mutex);
#elif defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
status=pthread_mutex_lock(&translation_unit_mutex);
if (status != 0)
{
errno=status;
ThrowFatalException(ResourceLimitFatalError,"UnableToLockSemaphore");
}
}
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
while (InterlockedCompareExchange(&translation_unit_mutex,1L,0L) != 0)
Sleep(10);
#endif
}
static inline void UnlockMagickMutex(void)
{
#if defined(MAGICKCORE_OPENMP_SUPPORT)
if (translation_unit_initialized == MagickFalse)
InitializeMagickMutex();
omp_unset_lock(&translation_unit_mutex);
#elif defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
status=pthread_mutex_unlock(&translation_unit_mutex);
if (status != 0)
{
errno=status;
ThrowFatalException(ResourceLimitFatalError,"UnableToUnlockSemaphore");
}
}
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
InterlockedExchange(&translation_unit_mutex,0L);
#endif
}
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif