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Diffstat (limited to 'thirdparties/win32/include/directshow/msgthrd.h')
-rw-r--r-- | thirdparties/win32/include/directshow/msgthrd.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/thirdparties/win32/include/directshow/msgthrd.h b/thirdparties/win32/include/directshow/msgthrd.h new file mode 100644 index 0000000..208f03c --- /dev/null +++ b/thirdparties/win32/include/directshow/msgthrd.h @@ -0,0 +1,120 @@ +//------------------------------------------------------------------------------ +// File: MsgThrd.h +// +// Desc: DirectShow base classes - provides support for a worker thread +// class to which one can asynchronously post messages. +// +// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved. +//------------------------------------------------------------------------------ + + +// Message class - really just a structure. +// +class CMsg { +public: + UINT uMsg; + DWORD dwFlags; + LPVOID lpParam; + CAMEvent *pEvent; + + CMsg(UINT u, DWORD dw, __inout_opt LPVOID lp, __in_opt CAMEvent *pEvnt) + : uMsg(u), dwFlags(dw), lpParam(lp), pEvent(pEvnt) {} + + CMsg() + : uMsg(0), dwFlags(0L), lpParam(NULL), pEvent(NULL) {} +}; + +// This is the actual thread class. It exports all the usual thread control +// functions. The created thread is different from a normal WIN32 thread in +// that it is prompted to perform particaular tasks by responding to messages +// posted to its message queue. +// +class AM_NOVTABLE CMsgThread { +private: + static DWORD WINAPI DefaultThreadProc(__inout LPVOID lpParam); + DWORD m_ThreadId; + HANDLE m_hThread; + +protected: + + // if you want to override GetThreadMsg to block on other things + // as well as this queue, you need access to this + CGenericList<CMsg> m_ThreadQueue; + CCritSec m_Lock; + HANDLE m_hSem; + LONG m_lWaiting; + +public: + CMsgThread() + : m_ThreadId(0), + m_hThread(NULL), + m_lWaiting(0), + m_hSem(NULL), + // make a list with a cache of 5 items + m_ThreadQueue(NAME("MsgThread list"), 5) + { + } + + ~CMsgThread(); + // override this if you want to block on other things as well + // as the message loop + void virtual GetThreadMsg(__out CMsg *msg); + + // override this if you want to do something on thread startup + virtual void OnThreadInit() { + }; + + BOOL CreateThread(); + + BOOL WaitForThreadExit(__out LPDWORD lpdwExitCode) { + if (m_hThread != NULL) { + WaitForSingleObject(m_hThread, INFINITE); + return GetExitCodeThread(m_hThread, lpdwExitCode); + } + return FALSE; + } + + DWORD ResumeThread() { + return ::ResumeThread(m_hThread); + } + + DWORD SuspendThread() { + return ::SuspendThread(m_hThread); + } + + int GetThreadPriority() { + return ::GetThreadPriority(m_hThread); + } + + BOOL SetThreadPriority(int nPriority) { + return ::SetThreadPriority(m_hThread, nPriority); + } + + HANDLE GetThreadHandle() { + return m_hThread; + } + + DWORD GetThreadId() { + return m_ThreadId; + } + + + void PutThreadMsg(UINT uMsg, DWORD dwMsgFlags, + __in_opt LPVOID lpMsgParam, __in_opt CAMEvent *pEvent = NULL) { + CAutoLock lck(&m_Lock); + CMsg* pMsg = new CMsg(uMsg, dwMsgFlags, lpMsgParam, pEvent); + m_ThreadQueue.AddTail(pMsg); + if (m_lWaiting != 0) { + ReleaseSemaphore(m_hSem, m_lWaiting, 0); + m_lWaiting = 0; + } + } + + // This is the function prototype of the function that the client + // supplies. It is always called on the created thread, never on + // the creator thread. + // + virtual LRESULT ThreadMessageProc( + UINT uMsg, DWORD dwFlags, __inout_opt LPVOID lpParam, __in_opt CAMEvent *pEvent) = 0; +}; + |