107 lines
3 KiB
C++
107 lines
3 KiB
C++
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///////////////////////////////////////////////////////////////////////////
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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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