114 lines
2.2 KiB
C++
114 lines
2.2 KiB
C++
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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syncobj.hxx
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Abstract:
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Contains CCritSec helper class for working with critical sections.
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For now, there are no cross-process locks needed in winhttp, so this
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file only contains a wrapper for critical sections. This object
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will provide exception handling and checking to help protect
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against low-memory conditions that can generate exceptions.
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Contents:
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CCritSec
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Revision History:
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Created 21-Mar-2001
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--*/
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#ifndef __SYNCOBJ_HXX__
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#define __SYNCOBJ_HXX__ 1
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struct CCritSec
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{
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private:
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CRITICAL_SECTION _cs;
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BOOL _fInitialized;
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public:
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CCritSec() : _fInitialized(FALSE)
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{
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// Initialized the critical section on demand
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// via the Init() method.
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}
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~CCritSec()
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{
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FreeLock();
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}
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BOOL Init()
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{
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__try
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{
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// protect against STATUS_NO_MEMORY exceptions
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// in low memory (paged pool) conditions.
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InitializeCriticalSection(&_cs);
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_fInitialized = TRUE;
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return TRUE;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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}
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return FALSE;
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}
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BOOL Lock()
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{
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if (!_fInitialized)
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{
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return FALSE;
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}
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__try
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{
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// Word on the street is that EnterCriticalSection
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// can also generate a STATUS_NO_MEMORY exception,
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// at least on NT, if the system is out of non-paged
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// pool memory.
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EnterCriticalSection(&_cs);
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return TRUE;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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}
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return FALSE;
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}
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void Unlock()
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{
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if (_fInitialized)
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{
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LeaveCriticalSection(&_cs);
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}
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}
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void FreeLock()
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{
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if (_fInitialized)
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{
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DeleteCriticalSection(&_cs);
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_fInitialized = FALSE;
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}
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}
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BOOL IsInitialized()
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{
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return _fInitialized;
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}
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};
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#endif // __SYNCOBJ_HXX__
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