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Open Source Computer Vision Library
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92 lines
4.1 KiB
92 lines
4.1 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2005, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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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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// met: |
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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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// distribution. |
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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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// |
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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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/////////////////////////////////////////////////////////////////////////// |
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#ifndef INCLUDED_IMF_THREADING_H |
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#define INCLUDED_IMF_THREADING_H |
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//----------------------------------------------------------------------------- |
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// |
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// Threading support for the IlmImf library |
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// |
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// The IlmImf library uses threads to perform reading and writing |
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// of OpenEXR files in parallel. The thread that calls the library |
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// always performs the actual file IO (this is usually the main |
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// application thread) whereas a several worker threads perform |
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// data compression and decompression. The number of worker |
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// threads can be any non-negative value (a value of zero reverts |
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// to single-threaded operation). As long as there is at least |
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// one worker thread, file IO and compression can potentially be |
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// done concurrently through pinelining. If there are two or more |
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// worker threads, then pipelining as well as concurrent compression |
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// of multiple blocks can be performed. |
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// |
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// Threading in the Imf library is controllable at two granularities: |
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// |
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// * The functions in this file query and control the total number |
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// of worker threads, which will be created globally for the whole |
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// library. Regardless of how many input or output files are |
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// opened simultaneously, the library will use at most this number |
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// of worker threads to perform all work. The default number of |
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// global worker threads is zero (i.e. single-threaded operation; |
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// everything happens in the thread that calls the library). |
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// |
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// * Furthermore, it is possible to set the number of threads that |
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// each input or output file should keep busy. This number can |
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// be explicitly set for each file. The default behavior is for |
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// each file to try to occupy all worker threads in the library's |
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// thread pool. |
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// |
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//----------------------------------------------------------------------------- |
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namespace Imf { |
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//----------------------------------------------------------------------------- |
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// Return the number of Imf-global worker threads used for parallel |
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// compression and decompression of OpenEXR files. |
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//----------------------------------------------------------------------------- |
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int globalThreadCount (); |
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//----------------------------------------------------------------------------- |
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// Change the number of Imf-global worker threads |
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//----------------------------------------------------------------------------- |
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void setGlobalThreadCount (int count); |
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} // namespace Imf |
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#endif
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