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/src/FreeImage/Source/OpenEXR/IlmImf/ImfThreading.h

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 1///////////////////////////////////////////////////////////////////////////
 2//
 3// Copyright (c) 2005, Industrial Light & Magic, a division of Lucas
 4// Digital Ltd. LLC
 5// 
 6// All rights reserved.
 7// 
 8// Redistribution and use in source and binary forms, with or without
 9// modification, are permitted provided that the following conditions are
10// met:
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
16// distribution.
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. 
20// 
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.
32//
33///////////////////////////////////////////////////////////////////////////
34
35#ifndef INCLUDED_IMF_THREADING_H
36#define INCLUDED_IMF_THREADING_H
37
38//-----------------------------------------------------------------------------
39//
40//	Threading support for the IlmImf library
41//
42//	The IlmImf library uses threads to perform reading and writing
43//	of OpenEXR files in parallel.  The thread that calls the library
44//	always performs the actual file IO (this is usually the main
45//	application thread) whereas a several worker threads perform
46//	data compression and decompression.  The number of worker
47//	threads can be any non-negative value (a value of zero reverts
48//	to single-threaded operation).  As long as there is at least
49//	one worker thread, file IO and compression can potentially be
50//	done concurrently through pinelining.  If there are two or more
51//	worker threads, then pipelining as well as concurrent compression
52//	of multiple blocks can be performed.
53// 
54//	Threading in the Imf library is controllable at two granularities:
55//
56//	* The functions in this file query and control the total number
57//	  of worker threads, which will be created globally for the whole
58//	  library.  Regardless of how many input or output files are
59//	  opened simultaneously, the library will use at most this number
60//	  of worker threads to perform all work.  The default number of
61//	  global worker threads is zero (i.e. single-threaded operation;
62//	  everything happens in the thread that calls the library).
63//
64//	* Furthermore, it is possible to set the number of threads that
65//	  each input or output file should keep busy.  This number can
66//	  be explicitly set for each file.  The default behavior is for
67//	  each file to try to occupy all worker threads in the library's
68//	  thread pool.
69//
70//-----------------------------------------------------------------------------
71
72namespace Imf {
73
74
75//-----------------------------------------------------------------------------
76// Return the number of Imf-global worker threads used for parallel
77// compression and decompression of OpenEXR files.
78//-----------------------------------------------------------------------------
79    
80int     globalThreadCount ();
81
82
83//-----------------------------------------------------------------------------
84// Change the number of Imf-global worker threads
85//-----------------------------------------------------------------------------
86
87void    setGlobalThreadCount (int count);
88
89
90} // namespace Imf
91
92#endif