4905a19032
Fixes #fdo30794 Based on bin/add-modelines script (originally posted in mail 1286706307.1871.1399280959@webmail.messagingengine.com) Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org 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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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// MARKER(update_precomp.py): autogen include statement, do not remove
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#include "precompiled_unotools.hxx"
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#include "unotools/readwritemutexguard.hxx"
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#include <tools/debug.hxx>
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namespace utl {
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ReadWriteGuard::ReadWriteGuard( ReadWriteMutex& rMutexP,
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sal_Int32 nRequestMode )
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: rMutex( rMutexP )
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{
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// don't do anything until a pending write completed (or another
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// ReadWriteGuard leaves the ctor phase)
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::osl::MutexGuard aGuard( rMutex.pWriteMutex );
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nMode = nRequestMode;
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if ( nMode & ReadWriteGuardMode::nWrite )
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{
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rMutex.pWriteMutex->acquire();
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// wait for any read to complete
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// TODO: set up a waiting thread instead of a loop
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sal_Bool bWait = sal_True;
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do
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{
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rMutex.pMutex->acquire();
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bWait = (rMutex.nReadCount != 0);
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if ( nMode & ReadWriteGuardMode::nCriticalChange )
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bWait |= (rMutex.nBlockCriticalCount != 0);
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rMutex.pMutex->release();
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} while ( bWait );
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}
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else if ( nMode & ReadWriteGuardMode::nBlockCritical )
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{
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rMutex.pMutex->acquire();
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++rMutex.nBlockCriticalCount;
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rMutex.pMutex->release();
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}
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else
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{
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rMutex.pMutex->acquire();
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++rMutex.nReadCount;
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rMutex.pMutex->release();
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}
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}
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ReadWriteGuard::~ReadWriteGuard()
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{
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if ( nMode & ReadWriteGuardMode::nWrite )
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rMutex.pWriteMutex->release();
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else if ( nMode & ReadWriteGuardMode::nBlockCritical )
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{
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rMutex.pMutex->acquire();
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--rMutex.nBlockCriticalCount;
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rMutex.pMutex->release();
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}
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else
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{
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rMutex.pMutex->acquire();
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--rMutex.nReadCount;
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rMutex.pMutex->release();
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}
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}
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void ReadWriteGuard::changeReadToWrite()
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{
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sal_Bool bOk = !(nMode & (ReadWriteGuardMode::nWrite | ReadWriteGuardMode::nBlockCritical));
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DBG_ASSERT( bOk, "ReadWriteGuard::changeReadToWrite: can't" );
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if ( bOk )
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{
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// MUST release read before acquiring write mutex or dead lock would
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// occur if there was a write in another thread waiting for this read
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// to complete.
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rMutex.pMutex->acquire();
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--rMutex.nReadCount;
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rMutex.pMutex->release();
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rMutex.pWriteMutex->acquire();
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nMode |= ReadWriteGuardMode::nWrite;
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// wait for any other read to complete
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// TODO: set up a waiting thread instead of a loop
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sal_Bool bWait = sal_True;
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do
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{
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rMutex.pMutex->acquire();
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bWait = (rMutex.nReadCount != 0);
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rMutex.pMutex->release();
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} while ( bWait );
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}
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}
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} // namespace utl
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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