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Magick::MutexLock Class Reference

#include <Thread.h>


Public Member Functions

 MutexLock (void)
 ~MutexLock (void)
void lock (void)
void unlock (void)

Private Member Functions

 MutexLock (const MutexLock &original_)
MutexLock & operator= (const MutexLock &original_)

Constructor & Destructor Documentation

Magick::MutexLock::MutexLock (  void   ) 
 

Definition at line 16 of file Thread.cpp.

References OptionError, and Magick::throwExceptionExplicit(). 

00019   : _mutex()
00020 {
00021   ::pthread_mutexattr_t attr;
00022   int sysError;
00023   if ( (sysError = ::pthread_mutexattr_init( &attr )) == 0 )
00024     if ( (sysError = ::pthread_mutex_init( &_mutex, &attr )) == 0 )
00025       {
00026         ::pthread_mutexattr_destroy( &attr );
00027         return;
00028       }
00029   throwExceptionExplicit( OptionError, "mutex initialization failed",
00030                           strerror(sysError) );
00031 }
00032 #else
00033 #if defined(_VISUALC_) && defined(_MT)
00034 // Win32 threads
00035   : _mutex()
00036 {
00037   SECURITY_ATTRIBUTES security;
00038 
00039   /* Allow the semaphore to be inherited */
00040   security.nLength = sizeof(security);
00041   security.lpSecurityDescriptor = NULL;
00042   security.bInheritHandle = TRUE;
00043 
00044   /* Create the semaphore, with initial value signaled */
00045   _mutex.id = ::CreateSemaphore(&security, 1, MAXSEMLEN, NULL);
00046   if ( _mutex.id != NULL )
00047     return;
00048   throwExceptionExplicit( OptionError, "mutex initialization failed" );
00049 }
00050 #else
00051 // Threads not supported
00052 {
00053 }

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Magick::MutexLock::~MutexLock (  void   ) 
 

Definition at line 58 of file Thread.cpp.

References OptionError, and Magick::throwExceptionExplicit(). 

00059 {
00060 #if defined(HasPTHREADS)
00061   int sysError;
00062   if ( (sysError = ::pthread_mutex_destroy( &_mutex )) == 0 )
00063     return;
00064   throwExceptionExplicit( OptionError, "mutex destruction failed",
00065                           strerror(sysError) );
00066 #endif
00067 #if defined(_MT) && defined(_VISUALC_)
00068   if ( ::CloseHandle(_mutex.id) != 0 )
00069     return;
00070   throwExceptionExplicit( OptionError, "mutex destruction failed" );
00071 #endif
00072 }

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Magick::MutexLock::MutexLock (  const MutexLock &  original_  )  [private]
 

Member Function Documentation

void Magick::MutexLock::lock (  void   ) 
 

Definition at line 75 of file Thread.cpp.

References OptionError, and Magick::throwExceptionExplicit().

Referenced by Magick::Lock::Lock(). 

00076 {
00077 #if defined(HasPTHREADS)
00078   int sysError;
00079   if ( (sysError = ::pthread_mutex_lock( &_mutex )) == 0)
00080     return;
00081   throwExceptionExplicit( OptionError, "mutex lock failed",
00082                           strerror(sysError));
00083 #endif
00084 #if defined(_MT) && defined(_VISUALC_)
00085   if (WaitForSingleObject(_mutex.id,INFINITE) != WAIT_FAILED)
00086     return;
00087   throwExceptionExplicit( OptionError, "mutex lock failed" );
00088 #endif
00089 }

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MutexLock& Magick::MutexLock::operator= (  const MutexLock &  original_  )  [private]
 

void Magick::MutexLock::unlock (  void   ) 
 

Definition at line 92 of file Thread.cpp.

References OptionError, and Magick::throwExceptionExplicit().

Referenced by Magick::Lock::~Lock(). 

00093 {
00094 #if defined(HasPTHREADS)
00095   int sysError;
00096   if ( (sysError = ::pthread_mutex_unlock( &_mutex )) == 0)
00097     return;
00098   throwExceptionExplicit( OptionError, "mutex unlock failed",
00099                           strerror(sysError) );
00100 #endif
00101 #if defined(_MT) && defined(_VISUALC_)
00102   if ( ReleaseSemaphore(_mutex.id, 1, NULL) == TRUE )
00103     return;
00104   throwExceptionExplicit( OptionError, "mutex unlock failed" );
00105 #endif
00106 }

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The documentation for this class was generated from the following files:
Generated on Mon Oct 25 13:48:31 2004 for ImageMagick by doxygen 1.3.7
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