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LeaveCriticalSection info  Overview  Group

The LeaveCriticalSection function releases ownership of the specified critical section object.

VOID LeaveCriticalSection(

    LPCRITICAL_SECTION lpCriticalSection 

// address of critical section object

   );

Parameters

lpCriticalSection
Points to the critical section object.

Return Values

This function does not return a value.

Remarks

The threads of a single process can use a critical-section object for mutual-exclusion synchronization. The process is responsible for allocating the memory used by a critical-section object, which it can do by declaring a variable of type CRITICAL_SECTION. Before using a critical section, some thread of the process must call the InitializeCriticalSection or InitializeCriticalSectionAndSpinCount function to initialize the object.

A thread uses the EnterCriticalSection or TryEnterCriticalSection function to acquire ownership of a critical section object. To release its ownership, the thread must call LeaveCriticalSection once for each time that it entered the critical section.

If a thread calls LeaveCriticalSection when it does not have ownership of the specified critical section object, an error occurs that may cause another thread using EnterCriticalSection to wait indefinitely.

Any thread of the process can use the DeleteCriticalSection function to release the system resources that were allocated when the critical section object was initialized. After this function has been called, the critical section object can no longer be used for synchronization.

See Also

DeleteCriticalSection, EnterCriticalSection, InitializeCriticalSection, InitializeCriticalSectionAndSpinCount, TryEnterCriticalSection


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