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      1 /*
      2   Copyright 1999-2019 ImageMagick Studio LLC, a non-profit organization
      3   dedicated to making software imaging solutions freely available.
      4 
      5   You may not use this file except in compliance with the License.  You may
      6   obtain a copy of the License at
      7 
      8     https://imagemagick.org/script/license.php
      9 
     10   Unless required by applicable law or agreed to in writing, software
     11   distributed under the License is distributed on an "AS IS" BASIS,
     12   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13   See the License for the specific language governing permissions and
     14   limitations under the License.
     15 
     16   MagickCore private methods to lock and unlock semaphores.
     17 */
     18 #ifndef MAGICKCORE_SEMAPHORE_PRIVATE_H
     19 #define MAGICKCORE_SEMAPHORE_PRIVATE_H
     20 
     21 #if defined(__cplusplus) || defined(c_plusplus)
     22 extern "C" {
     23 #endif
     24 
     25 extern MagickPrivate MagickBooleanType
     26   SemaphoreComponentGenesis(void);
     27 
     28 extern MagickPrivate void
     29   SemaphoreComponentTerminus(void);
     30 
     31 #if defined(MAGICKCORE_OPENMP_SUPPORT)
     32 static omp_lock_t
     33   semaphore_mutex;
     34 #elif defined(MAGICKCORE_THREAD_SUPPORT)
     35 static pthread_mutex_t
     36   semaphore_mutex = PTHREAD_MUTEX_INITIALIZER;
     37 #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
     38 static LONG
     39   semaphore_mutex = 0;
     40 #else
     41 static ssize_t
     42   semaphore_mutex = 0;
     43 #endif
     44 
     45 static MagickBooleanType
     46   active_mutex = MagickFalse;
     47 
     48 static inline void DestroyMagickMutex(void)
     49 {
     50 #if defined(MAGICKCORE_OPENMP_SUPPORT)
     51   if (active_mutex != MagickFalse)
     52     omp_destroy_lock(&semaphore_mutex);
     53 #endif
     54   active_mutex=MagickFalse;
     55 }
     56 
     57 static inline void InitializeMagickMutex(void)
     58 {
     59 #if defined(MAGICKCORE_OPENMP_SUPPORT)
     60   if (active_mutex == MagickFalse)
     61     omp_init_lock(&semaphore_mutex);
     62 #endif
     63   active_mutex=MagickTrue;
     64 }
     65 
     66 static inline void LockMagickMutex(void)
     67 {
     68 #if defined(MAGICKCORE_OPENMP_SUPPORT)
     69   omp_set_lock(&semaphore_mutex);
     70 #elif defined(MAGICKCORE_THREAD_SUPPORT)
     71   {
     72     int
     73       status;
     74 
     75     status=pthread_mutex_lock(&semaphore_mutex);
     76     if (status != 0)
     77       {
     78         errno=status;
     79         ThrowFatalException(ResourceLimitFatalError,"UnableToLockSemaphore");
     80       }
     81   }
     82 #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
     83   while (InterlockedCompareExchange(&semaphore_mutex,1L,0L) != 0)
     84     Sleep(10);
     85 #endif
     86 }
     87 
     88 static inline void UnlockMagickMutex(void)
     89 {
     90 #if defined(MAGICKCORE_OPENMP_SUPPORT)
     91   omp_unset_lock(&semaphore_mutex);
     92 #elif defined(MAGICKCORE_THREAD_SUPPORT)
     93   {
     94     int
     95       status;
     96 
     97     status=pthread_mutex_unlock(&semaphore_mutex);
     98     if (status != 0)
     99       {
    100         errno=status;
    101         ThrowFatalException(ResourceLimitFatalError,"UnableToUnlockSemaphore");
    102       }
    103   }
    104 #elif defined(MAGICKCORE_WINDOWS_SUPPORT)
    105   InterlockedExchange(&semaphore_mutex,0L);
    106 #endif
    107 }
    108 
    109 #if defined(__cplusplus) || defined(c_plusplus)
    110 }
    111 #endif
    112 
    113 #endif
    114