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,
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29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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33 ///////////////////////////////////////////////////////////////////////////
35 #ifndef INCLUDED_ILM_THREAD_MUTEX_H
36 #define INCLUDED_ILM_THREAD_MUTEX_H
38 //-----------------------------------------------------------------------------
40 // class Mutex, class Lock
42 // Class Mutex is a wrapper for a system-dependent mutual exclusion
43 // mechanism. Actual locking and unlocking of a Mutex object must
44 // be performed using an instance of a Lock (defined below).
46 // Class lock provides safe locking and unlocking of mutexes even in
47 // the presence of C++ exceptions. Constructing a Lock object locks
48 // the mutex; destroying the Lock unlocks the mutex.
50 // Lock objects are not themselves thread-safe. You should never
51 // share a Lock object among multiple threads.
55 // Mutex mtx; // Create a Mutex object that is visible
56 // //to multiple threads
58 // ... // create some threads
60 // // Then, within each thread, construct a critical section like so:
63 // Lock lock (mtx); // Lock constructor locks the mutex
64 // ... // do some computation on shared data
65 // } // leaving the block unlocks the mutex
67 //-----------------------------------------------------------------------------
69 #include "OpenEXRConfig.h"
71 #if defined _WIN32 || defined _WIN64
98 #if defined _WIN32 || defined _WIN64
99 mutable CRITICAL_SECTION _mutex;
101 mutable pthread_mutex_t _mutex;
104 void operator = (const Mutex& M); // not implemented
105 Mutex (const Mutex& M); // not implemented
115 Lock (const Mutex& m, bool autoLock = true):
151 const Mutex & _mutex;
156 } // namespace IlmThread