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85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
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* PROGRAM: Client/Server Common Code
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* MODULE: locks.cpp
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* DESCRIPTION: Darwin specific semaphore support
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*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Alexander Peshkoff
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2007 Alexander Peshkoff <peshkoff@mail.ru>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#include "firebird.h"
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#include "../../common/classes/semaphore.h"
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#include "../../common/classes/alloc.h"
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#ifdef MIXED_SEMAPHORE_AND_FILE_HANDLE
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/*
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There is a problem with values returned by sem_open() in MacOS 10.5 and earlier.
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They are not pointers. They are handles, in format of file handle (0,1,2,3,...),
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and worse - they share same space with actual file handles. And when we close
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unneeded file handles in divorce_terminal(), we kill all global semaphores.
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MIXED_SEMAPHORE_AND_FILE_HANDLE exists to avoid it.
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*/
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#include <sys/param.h>
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namespace Firebird {
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SignalSafeSemaphore* SignalSafeSemaphore::initialList = 0;
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bool SignalSafeSemaphore::divorceDone = false;
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void SignalSafeSemaphore::linkToInitialList()
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{
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if (divorceDone)
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{
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return;
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}
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unsigned int n = (U_IPTR) sem;
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if (n < NOFILE)
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{
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next = initialList;
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initialList = this;
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}
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else
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{
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next = 0;
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}
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}
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bool SignalSafeSemaphore::checkHandle(int n)
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{
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divorceDone = true;
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for (SignalSafeSemaphore* cur = initialList; cur; cur = cur->next)
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{
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if (((IPTR) (cur->sem)) == n)
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{
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return true;
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}
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}
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return false;
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}
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} // namespace Firebird
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#endif // MIXED_SEMAPHORE_AND_FILE_HANDLE
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