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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfThreading.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// 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_IMF_THREADING_H
+#define INCLUDED_IMF_THREADING_H
+
+#include "ImfExport.h"
+#include "ImfNamespace.h"
+
+//-----------------------------------------------------------------------------
+//
+//	Threading support for the IlmImf library
+//
+//	The IlmImf library uses threads to perform reading and writing
+//	of OpenEXR files in parallel.  The thread that calls the library
+//	always performs the actual file IO (this is usually the main
+//	application thread) whereas a several worker threads perform
+//	data compression and decompression.  The number of worker
+//	threads can be any non-negative value (a value of zero reverts
+//	to single-threaded operation).  As long as there is at least
+//	one worker thread, file IO and compression can potentially be
+//	done concurrently through pinelining.  If there are two or more
+//	worker threads, then pipelining as well as concurrent compression
+//	of multiple blocks can be performed.
+// 
+//	Threading in the Imf library is controllable at two granularities:
+//
+//	* The functions in this file query and control the total number
+//	  of worker threads, which will be created globally for the whole
+//	  library.  Regardless of how many input or output files are
+//	  opened simultaneously, the library will use at most this number
+//	  of worker threads to perform all work.  The default number of
+//	  global worker threads is zero (i.e. single-threaded operation;
+//	  everything happens in the thread that calls the library).
+//
+//	* Furthermore, it is possible to set the number of threads that
+//	  each input or output file should keep busy.  This number can
+//	  be explicitly set for each file.  The default behavior is for
+//	  each file to try to occupy all worker threads in the library's
+//	  thread pool.
+//
+//-----------------------------------------------------------------------------
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
+
+
+//-----------------------------------------------------------------------------
+// Return the number of Imf-global worker threads used for parallel
+// compression and decompression of OpenEXR files.
+//-----------------------------------------------------------------------------
+    
+IMF_EXPORT int     globalThreadCount ();
+
+
+//-----------------------------------------------------------------------------
+// Change the number of Imf-global worker threads
+//-----------------------------------------------------------------------------
+
+IMF_EXPORT void    setGlobalThreadCount (int count);
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
+
+#endif