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Diffstat (limited to 'sal/osl/w32/mutex.c')
| -rw-r--r-- | sal/osl/w32/mutex.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/sal/osl/w32/mutex.c b/sal/osl/w32/mutex.c new file mode 100644 index 000000000000..db16459d7fe7 --- /dev/null +++ b/sal/osl/w32/mutex.c @@ -0,0 +1,206 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * 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. + * + ************************************************************************/ + +#include "system.h" + +#include <osl/mutex.h> +#include <osl/diagnose.h> + +/* + Implementation notes: + The void* hidden by oslMutex points to a WIN32 + CRITICAL_SECTION structure. +*/ + +typedef struct _oslMutexImpl { + CRITICAL_SECTION m_Mutex; + int m_Locks; + DWORD m_Owner; + DWORD m_Requests; +} oslMutexImpl; + +static BOOL (WINAPI *lpfTryEnterCriticalSection)(LPCRITICAL_SECTION) + = (BOOL (WINAPI *)(LPCRITICAL_SECTION))0xFFFFFFFF; + +static CRITICAL_SECTION MutexLock; + +/*****************************************************************************/ +/* osl_createMutex */ +/*****************************************************************************/ +oslMutex SAL_CALL osl_createMutex(void) +{ + oslMutexImpl *pMutexImpl; + + /* Window 95 does not support "TryEnterCriticalSection" */ + + if (lpfTryEnterCriticalSection == + (BOOL (WINAPI *)(LPCRITICAL_SECTION))0xFFFFFFFF) + { + OSVERSIONINFO VersionInformation = + + { + sizeof(OSVERSIONINFO), + 0, + 0, + 0, + 0, + "", + }; + + /* ts: Window 98 does not support "TryEnterCriticalSection" but export the symbol !!! + calls to that symbol always returns FALSE */ + if ( + GetVersionEx(&VersionInformation) && + (VersionInformation.dwPlatformId == VER_PLATFORM_WIN32_NT) + ) + { + lpfTryEnterCriticalSection = (BOOL (WINAPI *)(LPCRITICAL_SECTION)) + GetProcAddress(GetModuleHandle("KERNEL32"), + "TryEnterCriticalSection"); + } + else + { + lpfTryEnterCriticalSection = (BOOL (WINAPI *)(LPCRITICAL_SECTION))NULL; + } + + + InitializeCriticalSection(&MutexLock); + } + + pMutexImpl= calloc(sizeof(oslMutexImpl), 1); + + OSL_ASSERT(pMutexImpl); /* alloc successful? */ + + InitializeCriticalSection(&pMutexImpl->m_Mutex); + + return (oslMutex)pMutexImpl; +} + +/*****************************************************************************/ +/* osl_destroyMutex */ +/*****************************************************************************/ +void SAL_CALL osl_destroyMutex(oslMutex Mutex) +{ + oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex; + + if (pMutexImpl) + { + DeleteCriticalSection(&pMutexImpl->m_Mutex); + free(pMutexImpl); + } +} + +/*****************************************************************************/ +/* osl_acquireMutex */ +/*****************************************************************************/ +sal_Bool SAL_CALL osl_acquireMutex(oslMutex Mutex) +{ + oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex; + + OSL_ASSERT(Mutex); + + if (lpfTryEnterCriticalSection == NULL) + { + EnterCriticalSection(&MutexLock); + pMutexImpl->m_Requests++; + LeaveCriticalSection(&MutexLock); + + EnterCriticalSection(&pMutexImpl->m_Mutex); + + EnterCriticalSection(&MutexLock); + pMutexImpl->m_Requests--; + if (pMutexImpl->m_Locks++ == 0) + pMutexImpl->m_Owner = GetCurrentThreadId(); + LeaveCriticalSection(&MutexLock); + } + else + EnterCriticalSection(&pMutexImpl->m_Mutex); + + return sal_True; +} + +/*****************************************************************************/ +/* osl_tryToAcquireMutex */ +/*****************************************************************************/ +sal_Bool SAL_CALL osl_tryToAcquireMutex(oslMutex Mutex) +{ + sal_Bool ret = sal_False; + oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex; + + OSL_ASSERT(Mutex); + + if (lpfTryEnterCriticalSection != NULL) + return (sal_Bool)(lpfTryEnterCriticalSection(&pMutexImpl->m_Mutex) != FALSE); + else + { + EnterCriticalSection(&MutexLock); + + if ( ((pMutexImpl->m_Requests == 0) && (pMutexImpl->m_Locks == 0)) || + (pMutexImpl->m_Owner == GetCurrentThreadId()) ) + ret = osl_acquireMutex(Mutex); + + LeaveCriticalSection(&MutexLock); + } + + return ret; +} + +/*****************************************************************************/ +/* osl_releaseMutex */ +/*****************************************************************************/ +sal_Bool SAL_CALL osl_releaseMutex(oslMutex Mutex) +{ + oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex; + + OSL_ASSERT(Mutex); + + if (lpfTryEnterCriticalSection == NULL) + { + EnterCriticalSection(&MutexLock); + + if (--(pMutexImpl->m_Locks) == 0) + pMutexImpl->m_Owner = 0; + + LeaveCriticalSection(&MutexLock); + } + + LeaveCriticalSection(&pMutexImpl->m_Mutex); + + return sal_True; +} + +/*****************************************************************************/ +/* osl_getGlobalMutex */ +/*****************************************************************************/ + +/* initialized in dllentry.c */ +oslMutex g_Mutex; + +oslMutex * SAL_CALL osl_getGlobalMutex(void) +{ + return &g_Mutex; +} |