121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
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//------------------------------------------------------------------------------
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// File: MsgThrd.h
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//
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// Desc: DirectShow base classes - provides support for a worker thread
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// class to which one can asynchronously post messages.
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//
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// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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// Message class - really just a structure.
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//
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class CMsg {
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public:
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UINT uMsg;
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DWORD dwFlags;
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LPVOID lpParam;
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CAMEvent *pEvent;
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CMsg(UINT u, DWORD dw, __inout_opt LPVOID lp, __in_opt CAMEvent *pEvnt)
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: uMsg(u), dwFlags(dw), lpParam(lp), pEvent(pEvnt) {}
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CMsg()
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: uMsg(0), dwFlags(0L), lpParam(NULL), pEvent(NULL) {}
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};
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// This is the actual thread class. It exports all the usual thread control
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// functions. The created thread is different from a normal WIN32 thread in
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// that it is prompted to perform particaular tasks by responding to messages
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// posted to its message queue.
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//
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class AM_NOVTABLE CMsgThread {
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private:
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static DWORD WINAPI DefaultThreadProc(__inout LPVOID lpParam);
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DWORD m_ThreadId;
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HANDLE m_hThread;
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protected:
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// if you want to override GetThreadMsg to block on other things
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// as well as this queue, you need access to this
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CGenericList<CMsg> m_ThreadQueue;
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CCritSec m_Lock;
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HANDLE m_hSem;
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LONG m_lWaiting;
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public:
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CMsgThread()
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: m_ThreadId(0),
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m_hThread(NULL),
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m_lWaiting(0),
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m_hSem(NULL),
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// make a list with a cache of 5 items
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m_ThreadQueue(NAME("MsgThread list"), 5)
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{
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}
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~CMsgThread();
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// override this if you want to block on other things as well
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// as the message loop
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void virtual GetThreadMsg(__out CMsg *msg);
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// override this if you want to do something on thread startup
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virtual void OnThreadInit() {
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};
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BOOL CreateThread();
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BOOL WaitForThreadExit(__out LPDWORD lpdwExitCode) {
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if (m_hThread != NULL) {
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WaitForSingleObject(m_hThread, INFINITE);
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return GetExitCodeThread(m_hThread, lpdwExitCode);
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}
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return FALSE;
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}
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DWORD ResumeThread() {
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return ::ResumeThread(m_hThread);
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}
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DWORD SuspendThread() {
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return ::SuspendThread(m_hThread);
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}
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int GetThreadPriority() {
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return ::GetThreadPriority(m_hThread);
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}
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BOOL SetThreadPriority(int nPriority) {
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return ::SetThreadPriority(m_hThread, nPriority);
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}
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HANDLE GetThreadHandle() {
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return m_hThread;
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}
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DWORD GetThreadId() {
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return m_ThreadId;
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}
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void PutThreadMsg(UINT uMsg, DWORD dwMsgFlags,
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__in_opt LPVOID lpMsgParam, __in_opt CAMEvent *pEvent = NULL) {
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CAutoLock lck(&m_Lock);
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CMsg* pMsg = new CMsg(uMsg, dwMsgFlags, lpMsgParam, pEvent);
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m_ThreadQueue.AddTail(pMsg);
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if (m_lWaiting != 0) {
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ReleaseSemaphore(m_hSem, m_lWaiting, 0);
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m_lWaiting = 0;
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}
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}
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// This is the function prototype of the function that the client
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// supplies. It is always called on the created thread, never on
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// the creator thread.
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//
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virtual LRESULT ThreadMessageProc(
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UINT uMsg, DWORD dwFlags, __inout_opt LPVOID lpParam, __in_opt CAMEvent *pEvent) = 0;
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};
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