Initial community commit

Src/Plugins/Input/in_dshow/base/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;
+};
+