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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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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
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