107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
// 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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//
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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 attr;
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int 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( 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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: _mutex()
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{
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SECURITY_ATTRIBUTES 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 = NULL;
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security.bInheritHandle = TRUE;
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/* Create the semaphore, with initial value signaled */
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_mutex.id = ::CreateSemaphore(&security, 1, MAXSEMLEN, NULL);
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if ( _mutex.id != NULL )
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return;
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throwExceptionExplicit( OptionError, "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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int sysError;
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if ( (sysError = ::pthread_mutex_destroy( &_mutex )) == 0 )
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return;
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throwExceptionExplicit( OptionError, "mutex destruction 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 ( ::CloseHandle(_mutex.id) != 0 )
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return;
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throwExceptionExplicit( OptionError, "mutex destruction failed" );
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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 sysError;
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if ( (sysError = ::pthread_mutex_lock( &_mutex )) == 0)
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return;
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throwExceptionExplicit( 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.id,INFINITE) != WAIT_FAILED)
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return;
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throwExceptionExplicit( 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 sysError;
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if ( (sysError = ::pthread_mutex_unlock( &_mutex )) == 0)
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return;
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throwExceptionExplicit( 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.id, 1, NULL) == TRUE )
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return;
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throwExceptionExplicit( OptionError, "mutex unlock failed" );
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#endif
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}
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