MagickCore
6.8.5
semaphore-private.h
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/*
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Copyright 1999-2013 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.
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obtain a copy of the License at
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http://www.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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#if 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_HAVE_WINTHREADS)
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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
inline
void
LockMagickMutex
(
void
)
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{
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#if 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_HAVE_WINTHREADS)
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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_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_HAVE_WINTHREADS)
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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
magick
semaphore-private.h
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