1 /************************************************************************* 2 * 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * Copyright 2000, 2010 Oracle and/or its affiliates. 6 * 7 * OpenOffice.org - a multi-platform office productivity suite 8 * 9 * This file is part of OpenOffice.org. 10 * 11 * OpenOffice.org is free software: you can redistribute it and/or modify 12 * it under the terms of the GNU Lesser General Public License version 3 13 * only, as published by the Free Software Foundation. 14 * 15 * OpenOffice.org is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU Lesser General Public License version 3 for more details 19 * (a copy is included in the LICENSE file that accompanied this code). 20 * 21 * You should have received a copy of the GNU Lesser General Public License 22 * version 3 along with OpenOffice.org. If not, see 23 * <http://www.openoffice.org/license.html> 24 * for a copy of the LGPLv3 License. 25 * 26 ************************************************************************/ 27 28 #ifndef INCLUDED_SAL_INTERNAL_ONCE_H 29 #define INCLUDED_SAL_INTERNAL_ONCE_H 30 31 /** sal_once_type 32 * (platform dependent) 33 */ 34 35 #if defined(SAL_UNX) || defined(SAL_OS2) 36 37 #include <pthread.h> 38 39 typedef pthread_once_t sal_once_type; 40 41 #define SAL_ONCE_INIT PTHREAD_ONCE_INIT 42 #define SAL_ONCE(once, init) pthread_once((once), (init)) 43 44 #elif defined(SAL_W32) 45 46 #define WIN32_LEAN_AND_MEAN 47 #pragma warning(push,1) /* disable warnings within system headers */ 48 #include <windows.h> 49 #pragma warning(pop) 50 51 typedef struct sal_once_st sal_once_type; 52 struct sal_once_st 53 { 54 LONG volatile m_done; 55 LONG volatile m_lock; 56 }; 57 58 #define SAL_ONCE_INIT { 0, 0 } 59 #define SAL_ONCE(once, init) \ 60 { \ 61 sal_once_type * control = (once); \ 62 if (!(control->m_done)) \ 63 { \ 64 while (InterlockedExchange(&(control->m_lock), 1) == 1) Sleep(0); \ 65 if (!(control->m_done)) \ 66 { \ 67 void (*init_routine)(void) = (init); \ 68 (*init_routine)(); \ 69 control->m_done = 1; \ 70 } \ 71 InterlockedExchange(&(control->m_lock), 0); \ 72 } \ 73 } 74 75 #else 76 #error Unknown platform 77 #endif /* SAL_UNX | SAL_W32 */ 78 79 #endif /* INCLUDED_SAL_INTERNAL_ONCE_H */ 80