73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
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class CTryableCriticalSection
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{
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public:
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CTryableCriticalSection();
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~CTryableCriticalSection();
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public:
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void Lock();
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void Unlock();
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BOOL TryLock();
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private:
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BOOL TryLockPrivate(BOOL fTakeAlways);
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private:
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CRITICAL_SECTION m_csInner;
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CRITICAL_SECTION m_csOuter;
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LONG m_cRefs;
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};
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inline CTryableCriticalSection::CTryableCriticalSection()
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{
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InitializeCriticalSection(&m_csInner);
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InitializeCriticalSection(&m_csOuter);
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m_cRefs = 0;
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}
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inline CTryableCriticalSection::~CTryableCriticalSection()
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{
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DeleteCriticalSection(&m_csOuter);
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DeleteCriticalSection(&m_csInner);
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}
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inline void CTryableCriticalSection::Lock()
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{
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TryLockPrivate(TRUE);
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}
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inline void CTryableCriticalSection::Unlock()
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{
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LeaveCriticalSection(&m_csInner);
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InterlockedDecrement(&m_cRefs);
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}
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inline BOOL CTryableCriticalSection::TryLock()
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{
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return TryLockPrivate(FALSE);
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}
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inline BOOL CTryableCriticalSection::TryLockPrivate(BOOL fTakeAlways)
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{
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BOOL fLocked = FALSE;
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EnterCriticalSection(&m_csOuter);
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if (fTakeAlways || !m_cRefs)
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{
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fLocked = TRUE;
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InterlockedIncrement(&m_cRefs);
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EnterCriticalSection(&m_csInner);
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}
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LeaveCriticalSection(&m_csOuter);
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return fLocked;
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}
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