142 lines
3 KiB
C++
142 lines
3 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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timer.cpp
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Abstract:
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Contains:
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Routines for timer operations
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Environment:
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User Mode - Win32
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History:
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1. 14-Feb-2000 -- File creation (based on Ilya Kleyman (ilyak)
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previous work by AjayCh)
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--*/
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#include "stdafx.h"
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Global Variables //
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// //
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///////////////////////////////////////////////////////////////////////////////
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// TIMER_PROCESSOR ------------------------------------------------------------------
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/*
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* This function is passed as the callback in the
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* CreateTimerQueueTimer() function
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*/
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// static
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void WINAPI TimeoutCallback (
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IN PVOID Context,
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IN BOOLEAN TimerFired)
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{
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TIMER_PROCESSOR *pTimerProcessor = (TIMER_PROCESSOR *) Context;
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pTimerProcessor->TimerCallback();
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// At this point the timer would have been canceled because
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// this is a one shot timer (no period)
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}
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/*++
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Routine Description:
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Create a timer.
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Arguments:
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Return Values:
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if Success the caller should increase the ref count.
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--*/
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DWORD TIMER_PROCESSOR::TimprocCreateTimer (
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IN DWORD TimeoutValue)
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{
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HRESULT Result;
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if (m_TimerHandle) {
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DebugF (_T("H323: timer is already pending, cannot create new timer.\n"));
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return E_FAIL;
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}
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IncrementLifetimeCounter ();
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if (CreateTimerQueueTimer(&m_TimerHandle,
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NATH323_TIMER_QUEUE,
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TimeoutCallback,
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this,
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TimeoutValue,
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0, // One shot timer
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WT_EXECUTEINIOTHREAD)) {
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assert (m_TimerHandle);
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Result = S_OK;
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}
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else {
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Result = GetLastResult();
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DecrementLifetimeCounter ();
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}
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return Result;
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}
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/*++
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Routine Description:
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Cancel the timer if there is one. Otherwise simply return.
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Arguments:
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Return Values:
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--*/
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// If Canceling the timer fails this means that the
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// timer callback could be pending. In this scenario,
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// the timer callback could execute later and so we
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// should not release the refcount on the TIMER_CALLBACK
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// The refcount will be released in the TimerCallback().
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// Release the ref count if callback is NOT pending.
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DWORD TIMER_PROCESSOR::TimprocCancelTimer (void) {
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HRESULT HResult = S_OK;
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if (m_TimerHandle != NULL) {
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if (DeleteTimerQueueTimer(NATH323_TIMER_QUEUE, m_TimerHandle, NULL)) {
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DecrementLifetimeCounter ();
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}
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else {
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HResult = GetLastError ();
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}
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m_TimerHandle = NULL;
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}
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return HResult;
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}
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