/////////////////////////////////////////////////////////////////////////// // // 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