/*
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Copyright 1999-2019 ImageMagick Studio LLC, a non-profit organization
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dedicated to making software imaging solutions freely available.
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You may not use this file except in compliance with the License. You may
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obtain a copy of the License at
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https://imagemagick.org/script/license.php
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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MagickCore private methods to lock and unlock semaphores.
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*/
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#ifndef MAGICKCORE_SEMAPHORE_PRIVATE_H
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#define MAGICKCORE_SEMAPHORE_PRIVATE_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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extern MagickPrivate MagickBooleanType
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SemaphoreComponentGenesis(void);
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extern MagickPrivate void
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SemaphoreComponentTerminus(void);
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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static omp_lock_t
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semaphore_mutex;
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#elif defined(MAGICKCORE_THREAD_SUPPORT)
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static pthread_mutex_t
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semaphore_mutex = PTHREAD_MUTEX_INITIALIZER;
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#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
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static LONG
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semaphore_mutex = 0;
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#else
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static ssize_t
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semaphore_mutex = 0;
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#endif
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static MagickBooleanType
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active_mutex = MagickFalse;
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static inline void DestroyMagickMutex(void)
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{
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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if (active_mutex != MagickFalse)
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omp_destroy_lock(&semaphore_mutex);
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#endif
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active_mutex=MagickFalse;
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}
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static inline void InitializeMagickMutex(void)
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{
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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if (active_mutex == MagickFalse)
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omp_init_lock(&semaphore_mutex);
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#endif
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active_mutex=MagickTrue;
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}
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static inline void LockMagickMutex(void)
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{
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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omp_set_lock(&semaphore_mutex);
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#elif defined(MAGICKCORE_THREAD_SUPPORT)
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{
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int
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status;
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status=pthread_mutex_lock(&semaphore_mutex);
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if (status != 0)
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{
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errno=status;
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ThrowFatalException(ResourceLimitFatalError,"UnableToLockSemaphore");
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}
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}
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#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
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while (InterlockedCompareExchange(&semaphore_mutex,1L,0L) != 0)
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Sleep(10);
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#endif
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}
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static inline void UnlockMagickMutex(void)
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{
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#if defined(MAGICKCORE_OPENMP_SUPPORT)
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omp_unset_lock(&semaphore_mutex);
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#elif defined(MAGICKCORE_THREAD_SUPPORT)
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{
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int
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status;
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status=pthread_mutex_unlock(&semaphore_mutex);
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if (status != 0)
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{
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errno=status;
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ThrowFatalException(ResourceLimitFatalError,"UnableToUnlockSemaphore");
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}
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}
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#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
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InterlockedExchange(&semaphore_mutex,0L);
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#endif
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif
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