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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: once.h,v $
* $Revision: 1.4 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef INCLUDED_SAL_INTERNAL_ONCE_H
#define INCLUDED_SAL_INTERNAL_ONCE_H
/** sal_once_type
* (platform dependent)
*/
#if defined(SAL_UNX) || defined(SAL_OS2)
#include <pthread.h>
typedef pthread_once_t sal_once_type;
#define SAL_ONCE_INIT PTHREAD_ONCE_INIT
#define SAL_ONCE(once, init) pthread_once((once), (init))
#elif defined(SAL_W32)
#define WIN32_LEAN_AND_MEAN
#pragma warning(push,1) /* disable warnings within system headers */
#include <windows.h>
#pragma warning(pop)
typedef struct sal_once_st sal_once_type;
struct sal_once_st
{
LONG volatile m_done;
LONG volatile m_lock;
};
#define SAL_ONCE_INIT { 0, 0 }
#define SAL_ONCE(once, init) \
{ \
sal_once_type * control = (once); \
if (!(control->m_done)) \
{ \
while (InterlockedExchange(&(control->m_lock), 1) == 1) Sleep(0); \
if (!(control->m_done)) \
{ \
void (*init_routine)(void) = (init); \
(*init_routine)(); \
control->m_done = 1; \
} \
InterlockedExchange(&(control->m_lock), 0); \
} \
}
#else
#error Unknown platform
#endif /* SAL_UNX | SAL_W32 */
#endif /* INCLUDED_SAL_INTERNAL_ONCE_H */
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