Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | //------------------------------------------------------------------------------
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| 2 | // File: MsgThrd.h
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| 3 | //
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| 4 | // Desc: DirectShow base classes - provides support for a worker thread
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| 5 | // class to which one can asynchronously post messages.
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| 6 | //
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| 7 | // Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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| 8 | //------------------------------------------------------------------------------
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| 9 |
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| 10 |
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| 11 | // Message class - really just a structure.
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| 12 | //
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| 13 | class CMsg {
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| 14 | public:
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| 15 | UINT uMsg;
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| 16 | DWORD dwFlags;
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| 17 | LPVOID lpParam;
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| 18 | CAMEvent *pEvent;
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| 19 |
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| 20 | CMsg(UINT u, DWORD dw, __inout_opt LPVOID lp, __in_opt CAMEvent *pEvnt)
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| 21 | : uMsg(u), dwFlags(dw), lpParam(lp), pEvent(pEvnt) {}
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| 22 |
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| 23 | CMsg()
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| 24 | : uMsg(0), dwFlags(0L), lpParam(NULL), pEvent(NULL) {}
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| 25 | };
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| 26 |
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| 27 | // This is the actual thread class. It exports all the usual thread control
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| 28 | // functions. The created thread is different from a normal WIN32 thread in
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| 29 | // that it is prompted to perform particaular tasks by responding to messages
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| 30 | // posted to its message queue.
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| 31 | //
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| 32 | class AM_NOVTABLE CMsgThread {
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| 33 | private:
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| 34 | static DWORD WINAPI DefaultThreadProc(__inout LPVOID lpParam);
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| 35 | DWORD m_ThreadId;
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| 36 | HANDLE m_hThread;
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| 37 |
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| 38 | protected:
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| 39 |
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| 40 | // if you want to override GetThreadMsg to block on other things
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| 41 | // as well as this queue, you need access to this
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| 42 | CGenericList<CMsg> m_ThreadQueue;
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| 43 | CCritSec m_Lock;
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| 44 | HANDLE m_hSem;
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| 45 | LONG m_lWaiting;
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| 46 |
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| 47 | public:
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| 48 | CMsgThread()
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| 49 | : m_ThreadId(0),
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| 50 | m_hThread(NULL),
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| 51 | m_lWaiting(0),
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| 52 | m_hSem(NULL),
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| 53 | // make a list with a cache of 5 items
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| 54 | m_ThreadQueue(NAME("MsgThread list"), 5)
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| 55 | {
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| 56 | }
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| 57 |
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| 58 | ~CMsgThread();
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| 59 | // override this if you want to block on other things as well
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| 60 | // as the message loop
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| 61 | void virtual GetThreadMsg(__out CMsg *msg);
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| 62 |
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| 63 | // override this if you want to do something on thread startup
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| 64 | virtual void OnThreadInit() {
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| 65 | };
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| 66 |
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| 67 | BOOL CreateThread();
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| 68 |
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| 69 | BOOL WaitForThreadExit(__out LPDWORD lpdwExitCode) {
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| 70 | if (m_hThread != NULL) {
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| 71 | WaitForSingleObject(m_hThread, INFINITE);
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| 72 | return GetExitCodeThread(m_hThread, lpdwExitCode);
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| 73 | }
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| 74 | return FALSE;
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| 75 | }
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| 76 |
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| 77 | DWORD ResumeThread() {
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| 78 | return ::ResumeThread(m_hThread);
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| 79 | }
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| 80 |
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| 81 | DWORD SuspendThread() {
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| 82 | return ::SuspendThread(m_hThread);
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| 83 | }
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| 84 |
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| 85 | int GetThreadPriority() {
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| 86 | return ::GetThreadPriority(m_hThread);
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| 87 | }
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| 88 |
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| 89 | BOOL SetThreadPriority(int nPriority) {
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| 90 | return ::SetThreadPriority(m_hThread, nPriority);
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| 91 | }
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| 92 |
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| 93 | HANDLE GetThreadHandle() {
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| 94 | return m_hThread;
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| 95 | }
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| 96 |
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| 97 | DWORD GetThreadId() {
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| 98 | return m_ThreadId;
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| 99 | }
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| 100 |
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| 101 |
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| 102 | void PutThreadMsg(UINT uMsg, DWORD dwMsgFlags,
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| 103 | __in_opt LPVOID lpMsgParam, __in_opt CAMEvent *pEvent = NULL) {
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| 104 | CAutoLock lck(&m_Lock);
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| 105 | CMsg* pMsg = new CMsg(uMsg, dwMsgFlags, lpMsgParam, pEvent);
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| 106 | m_ThreadQueue.AddTail(pMsg);
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| 107 | if (m_lWaiting != 0) {
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| 108 | ReleaseSemaphore(m_hSem, m_lWaiting, 0);
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| 109 | m_lWaiting = 0;
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| 110 | }
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| 111 | }
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| 112 |
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| 113 | // This is the function prototype of the function that the client
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| 114 | // supplies. It is always called on the created thread, never on
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| 115 | // the creator thread.
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| 116 | //
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| 117 | virtual LRESULT ThreadMessageProc(
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| 118 | UINT uMsg, DWORD dwFlags, __inout_opt LPVOID lpParam, __in_opt CAMEvent *pEvent) = 0;
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| 119 | };
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| 120 |
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