ncbiatomic.cpp
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- /*
- * ===========================================================================
- * PRODUCTION $Log: ncbiatomic.cpp,v $
- * PRODUCTION Revision 1000.1 2004/06/01 19:08:51 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.2
- * PRODUCTION
- * ===========================================================================
- */
- /* $Id: ncbiatomic.cpp,v 1000.1 2004/06/01 19:08:51 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Author: Aaron Ucko
- *
- * File Description:
- * SwapPointers -- atomic pointer swap operation
- *
- */
- #include <ncbi_pch.hpp>
- #include <corelib/ncbiatomic.hpp>
- #ifdef NCBI_SLOW_ATOMIC_SWAP
- #include <corelib/ncbimtx.hpp>
- BEGIN_NCBI_SCOPE
- DEFINE_STATIC_FAST_MUTEX(sx_AtomicPointerMutex);
- void* x_SwapPointers(void * volatile * nv_loc, void* new_value)
- {
- CFastMutexGuard LOCK(sx_AtomicPointerMutex);
- void* old_value = *nv_loc;
- *nv_loc = new_value;
- return old_value;
- }
- END_NCBI_SCOPE
- #endif//NCBI_SLOW_ATOMIC_SWAP
- /*
- * ===========================================================================
- * $Log: ncbiatomic.cpp,v $
- * Revision 1000.1 2004/06/01 19:08:51 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.2
- *
- * Revision 1.2 2004/05/14 13:59:27 gorelenk
- * Added include of ncbi_pch.hpp
- *
- * Revision 1.1 2003/09/17 15:20:46 vasilche
- * Moved atomic counter swap functions to separate file.
- * Added CRef<>::AtomicResetFrom(), CRef<>::AtomicReleaseTo() methods.
- *
- * Revision 1.28 2003/06/27 17:28:08 ucko
- * +SwapPointers
- * ===========================================================================
- */