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Locks the critical section object.
void Lock( );
Return Values
No return value.
Remarks
This member function locks the critical section object. You can make multiple lock calls on the same thread, but the CCritSec::Unlockmember function must be called a corresponding number of times before the object is unlocked. If the object is locked by another thread, the CCritSec::Lockmember function blocks until either the object is released or a "possible deadlock" exception occurs.