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Viewing changes to src/common/classes/locks.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Damyan Ivanov
  • Date: 2008-05-26 23:59:25 UTC
  • Revision ID: james.westby@ubuntu.com-20080526235925-2pnqj6nxpppoeaer
Tags: upstream-2.1.0.17798-0.ds2
Import upstream version 2.1.0.17798-0.ds2

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src/common/classes/locks.cpp
 
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/*
 
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 *      PROGRAM:                Client/Server Common Code
 
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 *      MODULE:                 locks.cpp
 
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 *      DESCRIPTION:    Win32 Mutex support compatible with 
 
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 *                                      old OS versions (like Windows 95)
 
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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) 2003 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 "../../include/firebird.h"
 
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#include "../../common/classes/locks.h"
 
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namespace Firebird {
 
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#ifdef WIN_NT
 
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#define MISS_SPIN_COUNT ((tSetCriticalSectionSpinCount *)(-1))
 
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#define INIT_SPIN_COUNT ((tSetCriticalSectionSpinCount *)(0))
 
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tSetCriticalSectionSpinCount* 
 
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        Spinlock::SetCriticalSectionSpinCount = INIT_SPIN_COUNT;
 
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Spinlock::Spinlock() {
 
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        if (SetCriticalSectionSpinCount == MISS_SPIN_COUNT)
 
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                return;
 
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        if (SetCriticalSectionSpinCount == INIT_SPIN_COUNT) {
 
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                HMODULE kernel32 = LoadLibrary("kernel32.dll");
 
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                if (! kernel32) {
 
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                        SetCriticalSectionSpinCount = MISS_SPIN_COUNT;
 
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                        return;
 
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                }
 
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                SetCriticalSectionSpinCount = 
 
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                        (tSetCriticalSectionSpinCount *) GetProcAddress(
 
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                                        kernel32, "SetCriticalSectionSpinCount");
 
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                if (! SetCriticalSectionSpinCount) {
 
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                        SetCriticalSectionSpinCount = MISS_SPIN_COUNT;
 
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                        return;
 
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                }
 
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        }
 
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        SetCriticalSectionSpinCount(&spinlock, 4000);
 
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}
 
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#endif  // WIN_NT
 
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}               // namespace Firebird