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112 lines
2.5 KiB
112 lines
2.5 KiB
// This may look like C code, but it is really -*- C++ -*-
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//
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// Copyright Bob Friesenhahn, 1999, 2000, 2001, 2002
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// Copyright Dirk Lemstra 2014-2017
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//
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// Implementation of thread support
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//
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#define MAGICKCORE_IMPLEMENTATION 1
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#define MAGICK_PLUSPLUS_IMPLEMENTATION 1
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#include "Magick++/Thread.h"
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#include "Magick++/Exception.h"
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#include <string.h>
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// Default constructor
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Magick::MutexLock::MutexLock(void)
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#if defined(MAGICKCORE_HAVE_PTHREAD)
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// POSIX threads
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: _mutex()
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{
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::pthread_mutexattr_t
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attr;
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int
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sysError;
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if ((sysError=::pthread_mutexattr_init(&attr)) == 0)
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if ((sysError=::pthread_mutex_init(&_mutex,&attr)) == 0)
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{
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::pthread_mutexattr_destroy(&attr);
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return;
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}
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throwExceptionExplicit(MagickCore::OptionError,"mutex initialization failed",
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strerror(sysError));
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}
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#else
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#if defined(_VISUALC_) && defined(_MT)
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// Win32 threads
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{
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SECURITY_ATTRIBUTES
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security;
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/* Allow the semaphore to be inherited */
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security.nLength=sizeof(security);
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security.lpSecurityDescriptor=(LPVOID) NULL;
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security.bInheritHandle=TRUE;
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/* Create the semaphore, with initial value signaled */
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_mutex=::CreateSemaphore(&security,1,1,(LPCSTR) NULL);
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if (_mutex != (HANDLE) NULL)
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return;
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throwExceptionExplicit(MagickCore::OptionError,
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"mutex initialization failed");
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}
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#else
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// Threads not supported
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{
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}
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#endif
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#endif
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// Destructor
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Magick::MutexLock::~MutexLock(void)
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{
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#if defined(MAGICKCORE_HAVE_PTHREAD)
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(void) ::pthread_mutex_destroy(&_mutex);
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#endif
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#if defined(_MT) && defined(_VISUALC_)
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(void) ::CloseHandle(_mutex);
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#endif
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}
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// Lock mutex
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void Magick::MutexLock::lock(void)
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{
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#if defined(MAGICKCORE_HAVE_PTHREAD)
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int
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sysError;
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if ((sysError=::pthread_mutex_lock(&_mutex)) == 0)
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return;
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throwExceptionExplicit(MagickCore::OptionError,"mutex lock failed",
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strerror(sysError));
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#endif
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#if defined(_MT) && defined(_VISUALC_)
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if (WaitForSingleObject(_mutex,INFINITE) != WAIT_FAILED)
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return;
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throwExceptionExplicit(MagickCore::OptionError,"mutex lock failed");
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#endif
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}
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// Unlock mutex
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void Magick::MutexLock::unlock(void)
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{
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#if defined(MAGICKCORE_HAVE_PTHREAD)
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int
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sysError;
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if ((sysError=::pthread_mutex_unlock(&_mutex)) == 0)
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return;
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throwExceptionExplicit(MagickCore::OptionError,"mutex unlock failed",
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strerror(sysError));
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#endif
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#if defined(_MT) && defined(_VISUALC_)
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if (ReleaseSemaphore(_mutex,1,(LPLONG) NULL) == TRUE)
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return;
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throwExceptionExplicit(MagickCore::OptionError,"mutex unlock failed");
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#endif
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}
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