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DEFINITIONS
This source file includes following definitions.
- AcquireSemaphoreInfo
- AcquireSemaphoreMemory
- RelinquishSemaphoreMemory
- AllocateSemaphoreInfo
- DestroySemaphoreInfo
- LockSemaphoreInfo
- RelinquishSemaphoreInfo
- SemaphoreComponentGenesis
- SemaphoreComponentTerminus
- UnlockSemaphoreInfo
/*
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% SSSSS EEEEE M M AAA PPPP H H OOO RRRR EEEEE %
% SS E MM MM A A P P H H O O R R E %
% SSS EEE M M M AAAAA PPPP HHHHH O O RRRR EEE %
% SS E M M A A P H H O O R R E %
% SSSSS EEEEE M M A A P H H OOO R R EEEEE %
% %
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% MagickCore Semaphore Methods %
% %
% Software Design %
% William Radcliffe %
% John Cristy %
% June 2000 %
% %
% %
% Copyright 1999-2013 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 %
% %
% http://www.imagemagick.org/script/license.php %
% %
% 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. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/memory_.h"
#include "magick/memory-private.h"
#include "magick/semaphore.h"
#include "magick/semaphore-private.h"
#include "magick/string_.h"
#include "magick/thread_.h"
#include "magick/thread-private.h"
/*
Struct declaractions.
*/
struct SemaphoreInfo
{
MagickMutexType
mutex;
MagickThreadType
id;
ssize_t
reference_count;
size_t
signature;
};
/*
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% A c q u i r e S e m a p h o r e I n f o %
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% AcquireSemaphoreInfo() acquires a semaphore.
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% The format of the AcquireSemaphoreInfo method is:
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% void AcquireSemaphoreInfo(SemaphoreInfo **semaphore_info)
%
% A description of each parameter follows:
%
% o semaphore_info: Specifies a pointer to an SemaphoreInfo structure.
%
*/
MagickExport void AcquireSemaphoreInfo(SemaphoreInfo **semaphore_info)
{
assert(semaphore_info != (SemaphoreInfo **) NULL);
if (*semaphore_info == (SemaphoreInfo *) NULL)
{
LockMagickMutex();
if (*semaphore_info == (SemaphoreInfo *) NULL)
*semaphore_info=AllocateSemaphoreInfo();
UnlockMagickMutex();
}
}
/*
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% A l l o c a t e S e m a p h o r e I n f o %
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% AllocateSemaphoreInfo() initializes the SemaphoreInfo structure.
%
% The format of the AllocateSemaphoreInfo method is:
%
% SemaphoreInfo *AllocateSemaphoreInfo(void)
%
*/
static void *AcquireSemaphoreMemory(const size_t count,const size_t quantum)
{
#define AlignedExtent(size,alignment) \
(((size)+((alignment)-1)) & ~((alignment)-1))
size_t
alignment,
extent,
size;
void
*memory;
size=count*quantum;
if ((count == 0) || (quantum != (size/count)))
{
errno=ENOMEM;
return((void *) NULL);
}
memory=NULL;
alignment=CACHE_LINE_SIZE;
extent=AlignedExtent(size,alignment);
if ((size == 0) || (alignment < sizeof(void *)) || (extent < size))
return((void *) NULL);
#if defined(MAGICKCORE_HAVE_POSIX_MEMALIGN)
if (posix_memalign(&memory,alignment,extent) != 0)
memory=NULL;
#elif defined(MAGICKCORE_HAVE__ALIGNED_MALLOC)
memory=_aligned_malloc(extent,alignment);
#else
{
void
*p;
extent=(size+alignment-1)+sizeof(void *);
if (extent > size)
{
p=malloc(extent);
if (p != NULL)
{
memory=(void *) AlignedExtent((size_t) p+sizeof(void *),alignment);
*((void **) memory-1)=p;
}
}
}
#endif
return(memory);
}
static void *RelinquishSemaphoreMemory(void *memory)
{
if (memory == (void *) NULL)
return((void *) NULL);
#if defined(MAGICKCORE_HAVE_POSIX_MEMALIGN)
free(memory);
#elif defined(MAGICKCORE_HAVE__ALIGNED_MALLOC)
_aligned_free(memory);
#else
free(*((void **) memory-1));
#endif
return(NULL);
}
MagickExport SemaphoreInfo *AllocateSemaphoreInfo(void)
{
SemaphoreInfo
*semaphore_info;
/*
Allocate semaphore.
*/
semaphore_info=(SemaphoreInfo *) AcquireSemaphoreMemory(1,
sizeof(*semaphore_info));
if (semaphore_info == (SemaphoreInfo *) NULL)
ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
(void) ResetMagickMemory(semaphore_info,0,sizeof(SemaphoreInfo));
/*
Initialize the semaphore.
*/
#if defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
pthread_mutexattr_t
mutex_info;
status=pthread_mutexattr_init(&mutex_info);
if (status != 0)
{
errno=status;
perror("unable to initialize mutex attributes");
_exit(1);
}
#if defined(MAGICKCORE_DEBUG)
#if defined(PTHREAD_MUTEX_ERRORCHECK)
status=pthread_mutex_settype(&mutex_info,PTHREAD_MUTEX_ERRORCHECK);
if (status != 0)
{
errno=status;
perror("unable to set mutex type");
_exit(1);
}
#endif
#endif
status=pthread_mutex_init(&semaphore_info->mutex,&mutex_info);
if (status != 0)
{
errno=status;
perror("unable to initialize mutex");
_exit(1);
}
status=pthread_mutexattr_destroy(&mutex_info);
if (status != 0)
{
errno=status;
perror("unable to destroy mutex attributes");
_exit(1);
}
}
#elif defined(MAGICKCORE_HAVE_WINTHREADS)
{
int
status;
status=InitializeCriticalSectionAndSpinCount(&semaphore_info->mutex,0x0400);
if (status == 0)
{
errno=status;
perror("unable to initialize critical section");
_exit(1);
}
}
#endif
semaphore_info->id=GetMagickThreadId();
semaphore_info->reference_count=0;
semaphore_info->signature=MagickSignature;
return(semaphore_info);
}
/*
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% D e s t r o y S e m a p h o r e I n f o %
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% DestroySemaphoreInfo() destroys a semaphore.
%
% The format of the DestroySemaphoreInfo method is:
%
% void DestroySemaphoreInfo(SemaphoreInfo **semaphore_info)
%
% A description of each parameter follows:
%
% o semaphore_info: Specifies a pointer to an SemaphoreInfo structure.
%
*/
MagickExport void DestroySemaphoreInfo(SemaphoreInfo **semaphore_info)
{
assert(semaphore_info != (SemaphoreInfo **) NULL);
assert((*semaphore_info) != (SemaphoreInfo *) NULL);
assert((*semaphore_info)->signature == MagickSignature);
LockMagickMutex();
#if defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
status=pthread_mutex_destroy(&(*semaphore_info)->mutex);
if (status != 0)
{
errno=status;
perror("unable to destroy mutex");
_exit(1);
}
}
#elif defined(MAGICKCORE_HAVE_WINTHREADS)
DeleteCriticalSection(&(*semaphore_info)->mutex);
#endif
(*semaphore_info)->signature=(~MagickSignature);
*semaphore_info=(SemaphoreInfo *) RelinquishSemaphoreMemory(*semaphore_info);
UnlockMagickMutex();
}
/*
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% L o c k S e m a p h o r e I n f o %
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% LockSemaphoreInfo() locks a semaphore.
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% The format of the LockSemaphoreInfo method is:
%
% void LockSemaphoreInfo(SemaphoreInfo *semaphore_info)
%
% A description of each parameter follows:
%
% o semaphore_info: Specifies a pointer to an SemaphoreInfo structure.
%
*/
MagickExport void LockSemaphoreInfo(SemaphoreInfo *semaphore_info)
{
assert(semaphore_info != (SemaphoreInfo *) NULL);
assert(semaphore_info->signature == MagickSignature);
#if defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
status=pthread_mutex_lock(&semaphore_info->mutex);
if (status != 0)
{
errno=status;
perror("unable to lock mutex");
_exit(1);
}
}
#elif defined(MAGICKCORE_HAVE_WINTHREADS)
EnterCriticalSection(&semaphore_info->mutex);
#endif
#if defined(MAGICKCORE_DEBUG)
if ((semaphore_info->reference_count > 0) &&
(IsMagickThreadEqual(semaphore_info->id) != MagickFalse))
{
(void) FormatLocaleFile(stderr,"Warning: unexpected recursive lock!\n");
(void) fflush(stderr);
}
#endif
semaphore_info->id=GetMagickThreadId();
semaphore_info->reference_count++;
}
/*
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% R e l i n g u i s h S e m a p h o r e I n f o %
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% RelinquishSemaphoreInfo() relinquishes a semaphore.
%
% The format of the RelinquishSemaphoreInfo method is:
%
% RelinquishSemaphoreInfo(SemaphoreInfo *semaphore_info)
%
% A description of each parameter follows:
%
% o semaphore_info: Specifies a pointer to an SemaphoreInfo structure.
%
*/
MagickExport void RelinquishSemaphoreInfo(SemaphoreInfo *semaphore_info)
{
assert(semaphore_info != (SemaphoreInfo *) NULL);
assert(semaphore_info->signature == MagickSignature);
UnlockSemaphoreInfo(semaphore_info);
}
/*
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% S e m a p h o r e C o m p o n e n t G e n e s i s %
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% SemaphoreComponentGenesis() instantiates the semaphore environment.
%
% The format of the SemaphoreComponentGenesis method is:
%
% MagickBooleanType SemaphoreComponentGenesis(void)
%
*/
MagickExport MagickBooleanType SemaphoreComponentGenesis(void)
{
LockMagickMutex();
UnlockMagickMutex();
return(MagickTrue);
}
/*
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% S e m a p h o r e C o m p o n e n t T e r m i n u s %
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% SemaphoreComponentTerminus() destroys the semaphore component.
%
% The format of the SemaphoreComponentTerminus method is:
%
% SemaphoreComponentTerminus(void)
%
*/
MagickExport void SemaphoreComponentTerminus(void)
{
}
/*
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% U n l o c k S e m a p h o r e I n f o %
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% UnlockSemaphoreInfo() unlocks a semaphore.
%
% The format of the UnlockSemaphoreInfo method is:
%
% void UnlockSemaphoreInfo(SemaphoreInfo *semaphore_info)
%
% A description of each parameter follows:
%
% o semaphore_info: Specifies a pointer to an SemaphoreInfo structure.
%
*/
MagickExport void UnlockSemaphoreInfo(SemaphoreInfo *semaphore_info)
{
assert(semaphore_info != (SemaphoreInfo *) NULL);
assert(semaphore_info->signature == MagickSignature);
#if defined(MAGICKCORE_DEBUG)
assert(IsMagickThreadEqual(semaphore_info->id) != MagickFalse);
if (semaphore_info->reference_count == 0)
{
(void) FormatLocaleFile(stderr,
"Warning: semaphore lock already unlocked!\n");
(void) fflush(stderr);
return;
}
semaphore_info->reference_count--;
#endif
#if defined(MAGICKCORE_THREAD_SUPPORT)
{
int
status;
status=pthread_mutex_unlock(&semaphore_info->mutex);
if (status != 0)
{
errno=status;
perror("unable to unlock mutex");
_exit(1);
}
}
#elif defined(MAGICKCORE_HAVE_WINTHREADS)
LeaveCriticalSection(&semaphore_info->mutex);
#endif
}