2008-04-01 18:49:53 +08:00
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/* -*-c++-*- OpenThreads library, Copyright (C) 2002 - 2007 The Open Thread Group
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*
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2012-03-22 01:36:20 +08:00
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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2008-04-01 18:49:53 +08:00
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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2012-03-22 01:36:20 +08:00
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*
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2008-04-01 18:49:53 +08:00
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2012-03-22 01:36:20 +08:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2008-04-01 18:49:53 +08:00
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef _OPENTHREAD_EXPORTS_H_
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#define _OPENTHREAD_EXPORTS_H_
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From Blasius Czink, "Among other things I added support for atomic operations on BSD-like systems and additional methods (for "and", "or", "xor").
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and a later post the same osg-submissions thread:
"it's been a while since I have made the changes but I think it was due to problems with static builds of OpenThreads on windows. I was using
OpenThreads in a communication/synchronisation library (without
OpenSceneGraph). It seems I forgot to post a small change in the CMakeLists file of OpenThreads. If a user turns DYNAMIC_OPENTHREADS to OFF (static build) OT_LIBRARY_STATIC will be defined in the Config.
Without these changes a windows user will always end up with a "__declspec(dllexport)" or "__declspec(dllimport)" which is a problem for static builds."
And another post from Blasius on this topic:
"I tested with VS2005 and VS2008. For 32 bit everything works as expected. For x64 and VS2008 I could successfully do the cmake-configure and then the compilation but I had occasional crashes of cmTryCompileExec.exe (during the cmake-configure phase) which seems to be a cmake bug. With VS2005 and 64bit cmake does not set _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED although the interlocked functionality should be there. If I place the source snippet from the CHECK_CXX_SOURCE_RUNS macro to a separate sourcefile I can compile and run the resulting executable successfully. Forcing OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED (on VS2005/x64) reveals a bug in "intrin.h" which seems to be fixed in VS2008 but not in VS2005.
In case anyone is interested the lines:
__MACHINEI(unsigned char _interlockedbittestandset(long *a, long b))
__MACHINEI(unsigned char _interlockedbittestandreset(long *a, long b))
__MACHINEX64(unsigned char _interlockedbittestandset64(__int64 *a, __int64 b))
__MACHINEX64(unsigned char _interlockedbittestandreset64(__int64 *a, __int64 b))
should be changed to:
__MACHINEI(unsigned char _interlockedbittestandset(long volatile *a, long b))
__MACHINEI(unsigned char _interlockedbittestandreset(long volatile *a, long b))
__MACHINEX64(unsigned char _interlockedbittestandset64(__int64 volatile *a, __int64 b))
__MACHINEX64(unsigned char _interlockedbittestandreset64(__int64 volatile *a, __int64 b))
The worst thing that can happen is that interlocked funtionality is not detected during cmake-configure and the mutex fallback is used.
Which reminds me another small glitch in the Atomic header so I attached a corrected version.
Why is the OT_LIBRARY_STATIC added to the config file? It is not needed anywhere.
OT_LIBRARY_STATIC is needed if you are doing static-builds on Windows. See my previous post on that.
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2008-10-27 18:42:58 +08:00
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#include <OpenThreads/Config>
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2008-04-01 18:49:53 +08:00
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#ifndef WIN32
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#define OPENTHREAD_EXPORT_DIRECTIVE
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#else
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#if defined( OT_LIBRARY_STATIC )
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#define OPENTHREAD_EXPORT_DIRECTIVE
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#elif defined( OPENTHREADS_EXPORTS )
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#define OPENTHREAD_EXPORT_DIRECTIVE __declspec(dllexport)
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#else
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#define OPENTHREAD_EXPORT_DIRECTIVE __declspec(dllimport)
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#endif
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#endif
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#endif
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