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///////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2005, Industrial Light & Magic, a division of Lucas
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_ILM_THREAD_H
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#define INCLUDED_ILM_THREAD_H
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//-----------------------------------------------------------------------------
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// Class Thread is a portable interface to a system-dependent thread
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// primitive. In order to make a thread actually do something useful,
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// you must derive a subclass from class Thread and implement the
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// run() function. If the operating system supports threading then
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// the run() function will be executed int a new thread.
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// The actual creation of the thread is done by the start() routine
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// which then calls the run() function. In general the start()
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// routine should be called from the constructor of the derived class.
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// The base-class thread destructor will join/destroy the thread.
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// IMPORTANT: Due to the mechanisms that encapsulate the low-level
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// threading primitives in a C++ class there is a race condition
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// with code resembling the following:
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// WorkerThread myThread;
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// } // myThread goes out of scope, is destroyed
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// // and the thread is joined
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// The race is between the parent thread joining the child thread
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// in the destructor of myThread, and the run() function in the
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// child thread. If the destructor gets executed first then run()
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// will be called with an invalid "this" pointer.
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// This issue can be fixed by using a Semaphore to keep track of
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// whether the run() function has already been called. You can
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// include a Semaphore member variable within your derived class
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// which you post() on in the run() function, and wait() on in the
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// destructor before the thread is joined. Alternatively you could
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// do something like this:
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// Semaphore runStarted;
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// void WorkerThread::run ()
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// WorkerThread myThread;
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// runStarted.wait (); // ensure that we have started
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// // the run function
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// } // myThread goes out of scope, is destroyed
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// // and the thread is joined
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//-----------------------------------------------------------------------------
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#include "IlmBaseConfig.h"
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#if defined _WIN32 || defined _WIN64
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#if defined(OPENEXR_DLL) && !defined(ZENO_STATIC)
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#ifdef ILMTHREAD_EXPORTS
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#define ILMTHREAD_EXPORT __declspec(dllexport)
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#define ILMTHREAD_EXPORT __declspec(dllimport)
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#define ILMTHREAD_EXPORT
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namespace IlmThread {
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// Query function to determine if the current platform supports
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// threads AND this library was compiled with threading enabled.
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ILMTHREAD_EXPORT bool supportsThreads ();
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class ILMTHREAD_EXPORT Thread
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virtual void run () = 0;
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#if defined _WIN32 || defined _WIN64
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void operator = (const Thread& t); // not implemented
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Thread (const Thread& t); // not implemented
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} // namespace IlmThread
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
///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_ILM_THREAD_H
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#define INCLUDED_ILM_THREAD_H
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//-----------------------------------------------------------------------------
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// Class Thread is a portable interface to a system-dependent thread
43
// primitive. In order to make a thread actually do something useful,
44
// you must derive a subclass from class Thread and implement the
45
// run() function. If the operating system supports threading then
46
// the run() function will be executed int a new thread.
48
// The actual creation of the thread is done by the start() routine
49
// which then calls the run() function. In general the start()
50
// routine should be called from the constructor of the derived class.
52
// The base-class thread destructor will join/destroy the thread.
54
// IMPORTANT: Due to the mechanisms that encapsulate the low-level
55
// threading primitives in a C++ class there is a race condition
56
// with code resembling the following:
59
// WorkerThread myThread;
60
// } // myThread goes out of scope, is destroyed
61
// // and the thread is joined
63
// The race is between the parent thread joining the child thread
64
// in the destructor of myThread, and the run() function in the
65
// child thread. If the destructor gets executed first then run()
66
// will be called with an invalid "this" pointer.
68
// This issue can be fixed by using a Semaphore to keep track of
69
// whether the run() function has already been called. You can
70
// include a Semaphore member variable within your derived class
71
// which you post() on in the run() function, and wait() on in the
72
// destructor before the thread is joined. Alternatively you could
73
// do something like this:
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// Semaphore runStarted;
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// void WorkerThread::run ()
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// WorkerThread myThread;
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// runStarted.wait (); // ensure that we have started
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// // the run function
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// } // myThread goes out of scope, is destroyed
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// // and the thread is joined
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//-----------------------------------------------------------------------------
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#include "IlmBaseConfig.h"
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#if defined _WIN32 || defined _WIN64
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#if defined(OPENEXR_DLL) && !defined(ZENO_STATIC)
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#ifdef ILMTHREAD_EXPORTS
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#define ILMTHREAD_EXPORT __declspec(dllexport)
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#define ILMTHREAD_EXPORT __declspec(dllimport)
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#define ILMTHREAD_EXPORT
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namespace IlmThread {
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// Query function to determine if the current platform supports
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// threads AND this library was compiled with threading enabled.
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ILMTHREAD_EXPORT bool supportsThreads ();
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class ILMTHREAD_EXPORT Thread
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virtual void run () = 0;
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#if defined _WIN32 || defined _WIN64
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void operator = (const Thread& t); // not implemented
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Thread (const Thread& t); // not implemented
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} // namespace IlmThread
added
removed
Source/OpenEXR/IlmThread/IlmThread.h
