1 ///////////////////////////////////////////////////////////////////////////
3 // Copyright (c) 2005, Industrial Light & Magic, a division of Lucas
6 // All rights reserved.
8 // Redistribution and use in source and binary forms, with or without
9 // modification, are permitted provided that the following conditions are
11 // * Redistributions of source code must retain the above copyright
12 // notice, this list of conditions and the following disclaimer.
13 // * Redistributions in binary form must reproduce the above
14 // copyright notice, this list of conditions and the following disclaimer
15 // in the documentation and/or other materials provided with the
17 // * Neither the name of Industrial Light & Magic nor the names of
18 // its contributors may be used to endorse or promote products derived
19 // from this software without specific prior written permission.
21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 ///////////////////////////////////////////////////////////////////////////
35 #ifndef INCLUDED_ILM_THREAD_SEMAPHORE_H
36 #define INCLUDED_ILM_THREAD_SEMAPHORE_H
38 //-----------------------------------------------------------------------------
40 // class Semaphore -- a wrapper class for
41 // system-dependent counting semaphores
43 //-----------------------------------------------------------------------------
45 #include "OpenEXRConfig.h"
47 #if defined _WIN32 || defined _WIN64
53 #elif HAVE_PTHREAD && !HAVE_POSIX_SEMAPHORES
55 #elif HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES
56 #include <semaphore.h>
66 Semaphore (unsigned int value = 0);
75 #if defined _WIN32 || defined _WIN64
77 mutable HANDLE _semaphore;
79 #elif HAVE_PTHREAD && !HAVE_POSIX_SEMAPHORES
82 // If the platform has Posix threads but no semapohores,
83 // then we implement them ourselves using condition variables
89 unsigned long numWaiting;
90 pthread_mutex_t mutex;
91 pthread_cond_t nonZero;
94 mutable sema_t _semaphore;
96 #elif HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES
98 mutable sem_t _semaphore;
102 void operator = (const Semaphore& s); // not implemented
103 Semaphore (const Semaphore& s); // not implemented
107 } // namespace IlmThread