mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
151 lines
4.9 KiB
151 lines
4.9 KiB
/////////////////////////////////////////////////////////////////////////// |
|
// |
|
// 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. |
|
// |
|
/////////////////////////////////////////////////////////////////////////// |
|
|
|
#ifndef INCLUDED_ILM_THREAD_H |
|
#define INCLUDED_ILM_THREAD_H |
|
|
|
//----------------------------------------------------------------------------- |
|
// |
|
// class Thread |
|
// |
|
// Class Thread is a portable interface to a system-dependent thread |
|
// primitive. In order to make a thread actually do something useful, |
|
// you must derive a subclass from class Thread and implement the |
|
// run() function. If the operating system supports threading then |
|
// the run() function will be executed int a new thread. |
|
// |
|
// The actual creation of the thread is done by the start() routine |
|
// which then calls the run() function. In general the start() |
|
// routine should be called from the constructor of the derived class. |
|
// |
|
// The base-class thread destructor will join/destroy the thread. |
|
// |
|
// IMPORTANT: Due to the mechanisms that encapsulate the low-level |
|
// threading primitives in a C++ class there is a race condition |
|
// with code resembling the following: |
|
// |
|
// { |
|
// WorkerThread myThread; |
|
// } // myThread goes out of scope, is destroyed |
|
// // and the thread is joined |
|
// |
|
// The race is between the parent thread joining the child thread |
|
// in the destructor of myThread, and the run() function in the |
|
// child thread. If the destructor gets executed first then run() |
|
// will be called with an invalid "this" pointer. |
|
// |
|
// This issue can be fixed by using a Semaphore to keep track of |
|
// whether the run() function has already been called. You can |
|
// include a Semaphore member variable within your derived class |
|
// which you post() on in the run() function, and wait() on in the |
|
// destructor before the thread is joined. Alternatively you could |
|
// do something like this: |
|
// |
|
// Semaphore runStarted; |
|
// |
|
// void WorkerThread::run () |
|
// { |
|
// runStarted.post() |
|
// // do some work |
|
// ... |
|
// } |
|
// |
|
// { |
|
// WorkerThread myThread; |
|
// runStarted.wait (); // ensure that we have started |
|
// // the run function |
|
// } // myThread goes out of scope, is destroyed |
|
// // and the thread is joined |
|
// |
|
//----------------------------------------------------------------------------- |
|
|
|
#include "IlmBaseConfig.h" |
|
|
|
#if defined _WIN32 || defined _WIN64 |
|
#ifdef NOMINMAX |
|
#undef NOMINMAX |
|
#endif |
|
#define NOMINMAX |
|
#include <windows.h> |
|
#include <process.h> |
|
#elif HAVE_PTHREAD |
|
#include <pthread.h> |
|
#endif |
|
|
|
#if defined(OPENEXR_DLL) && !defined(ZENO_STATIC) |
|
#ifdef ILMTHREAD_EXPORTS |
|
#define ILMTHREAD_EXPORT __declspec(dllexport) |
|
#else |
|
#define ILMTHREAD_EXPORT __declspec(dllimport) |
|
#endif |
|
#else |
|
#define ILMTHREAD_EXPORT |
|
#endif |
|
|
|
namespace IlmThread { |
|
|
|
// |
|
// Query function to determine if the current platform supports |
|
// threads AND this library was compiled with threading enabled. |
|
// |
|
|
|
ILMTHREAD_EXPORT bool supportsThreads (); |
|
|
|
|
|
class ILMTHREAD_EXPORT Thread |
|
{ |
|
public: |
|
|
|
Thread (); |
|
virtual ~Thread (); |
|
|
|
void start (); |
|
virtual void run () = 0; |
|
|
|
private: |
|
|
|
#if defined _WIN32 || defined _WIN64 |
|
HANDLE _thread; |
|
#elif HAVE_PTHREAD |
|
pthread_t _thread; |
|
#endif |
|
|
|
void operator = (const Thread& t); // not implemented |
|
Thread (const Thread& t); // not implemented |
|
}; |
|
|
|
|
|
} // namespace IlmThread |
|
|
|
#endif
|
|
|