CMsgThread Class (Windows Embedded CE 6.0)

1/6/2010

This class is a worker thread class that queues requests to the queuing thread for completion asynchronously.

To use this class, derive your class from it and override the CMsgThread::ThreadMessageProc member function.

The ThreadMessageProc member function carries out each request. Your client functions and the ThreadMessageProc member function must share a common definition of the parameters in the CMsg object.

A negotiated mechanism tells the worker thread to exit. Typically, this is one value of the CMsg class's uMsg message code.

It is a good idea to send this message from the destructor of your derived class and call the CMsgThread::WaitForThreadExit member function before completing the destruction of the derived class.

Protected Data Members

Member	Description
m_hSem	Indicates a handle used for signaling.
m_Lock	Protects access to lists.
m_lWaiting	Indicates waiting for a free thread.
m_ThreadQueue	Overrides the CMsgThread::GetThreadMsg member function and blocks on things other than this queue.

Member Functions

Member function	Description
CMsgThread	Constructs a CMsgThread object.
CreateThread	Creates a thread.
GetThreadHandle	Returns the thread handle.
GetThreadID	Returns the identifier of the thread.
GetThreadPriority	Retrieves the current thread priority.
PutThreadMsg	Queues a request for execution by the worker thread.
ResumeThread	Continues the operation of the worker thread.
SetThreadPriority	Sets the priority of the thread to a new value.
SuspendThread	Suspends the operation of a running thread.
WaitForThreadExit	Blocks until the thread has exited after a call to the CMsgThread::SuspendThread member function.

Overrideable Member Functions

Member function	Description
GetThreadMsg	Retrieves a queued CMsg object containing a request.
OnThreadInit	Provides initialization on a thread.
ThreadMessageProc	Processes requests. This is a pure virtual member function.

Requirements

Windows Embedded CE	Windows CE 2.12 and later
Note	Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements For more information, see Setting Up the Build Environment

See Also

Reference

DirectShow Classes