mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-26 10:10:32 +00:00
121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
|
//------------------------------------------------------------------------------
|
||
|
// 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;
|
||
|
};
|
||
|
|