CBaseFilter::m_pLock

CBaseFilter::m_pLock

Pointer to a critical section that is used to serialize state changes.

Syntax

  CCritSec *m_pLock;

Remarks

This variable is initialized in the class constructor; see CBaseFilter::CBaseFilter.

Hold this critical section during state transitions, or when a method accesses the state over several operations. The base class holds the critical section in the following methods:

• CBaseFilter::FindPin
• CBaseFilter::GetSyncSource
• CBaseFilter::JoinFilterGraph
• CBaseFilter::IsActive
• CBaseFilter::SetSyncSource
• CBaseFilter::Pause
• CBaseFilter::Run
• CBaseFilter::Stop

Do not hold this critical section during streaming operations (that is, when delivering samples to a downstream filter). Serialize streaming operations using a different critical section. Otherwise, it can cause deadlock.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also

• CBaseFilter Class
• Threads and Critical Sections