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Open Source Computer Vision Library
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106 lines
3.0 KiB
106 lines
3.0 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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//----------------------------------------------------------------------------- |
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// |
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// class Semaphore -- implementation for platforms |
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// that support Posix threads and Posix semaphores |
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// |
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//----------------------------------------------------------------------------- |
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#include "IlmBaseConfig.h" |
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#if HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES |
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#include "IlmThreadSemaphore.h" |
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#include "Iex.h" |
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#include <assert.h> |
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#include <errno.h> |
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ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_ENTER |
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Semaphore::Semaphore (unsigned int value) |
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{ |
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if (::sem_init (&_semaphore, 0, value)) |
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IEX_NAMESPACE::throwErrnoExc ("Cannot initialize semaphore (%T)."); |
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} |
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Semaphore::~Semaphore () |
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{ |
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int error = ::sem_destroy (&_semaphore); |
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assert (error == 0); |
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} |
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void |
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Semaphore::wait () |
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{ |
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while( ::sem_wait( &_semaphore ) == -1 && errno == EINTR ) |
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{ |
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} |
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} |
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bool |
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Semaphore::tryWait () |
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{ |
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return sem_trywait (&_semaphore) == 0; |
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} |
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void |
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Semaphore::post () |
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{ |
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if (::sem_post (&_semaphore)) |
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IEX_NAMESPACE::throwErrnoExc ("Post operation on semaphore failed (%T)."); |
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} |
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int |
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Semaphore::value () const |
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{ |
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int value; |
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if (::sem_getvalue (&_semaphore, &value)) |
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IEX_NAMESPACE::throwErrnoExc ("Cannot read semaphore value (%T)."); |
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return value; |
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} |
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ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_EXIT |
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#endif
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