| /////////////////////////////////////////////////////////////////////////// |
| // |
| // Copyright (c) 2005, 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> |
| |
| namespace IlmThread { |
| |
| |
| Semaphore::Semaphore (unsigned int value) |
| { |
| if (::sem_init (&_semaphore, 0, value)) |
| Iex::throwErrnoExc ("Cannot initialize semaphore (%T)."); |
| } |
| |
| |
| Semaphore::~Semaphore () |
| { |
| int error = ::sem_destroy (&_semaphore); |
| assert (error == 0); |
| } |
| |
| |
| void |
| Semaphore::wait () |
| { |
| ::sem_wait (&_semaphore); |
| } |
| |
| |
| bool |
| Semaphore::tryWait () |
| { |
| return sem_trywait (&_semaphore) == 0; |
| } |
| |
| |
| void |
| Semaphore::post () |
| { |
| if (::sem_post (&_semaphore)) |
| Iex::throwErrnoExc ("Post operation on semaphore failed (%T)."); |
| } |
| |
| |
| int |
| Semaphore::value () const |
| { |
| int value; |
| |
| if (::sem_getvalue (&_semaphore, &value)) |
| Iex::throwErrnoExc ("Cannot read semaphore value (%T)."); |
| |
| return value; |
| } |
| |
| |
| } // namespace IlmThread |
| |
| #endif |