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cs440-acg/ext/openexr/IlmBase/IlmThread/IlmThreadSemaphorePosix.cpp

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