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195 lines
3.2 KiB
195 lines
3.2 KiB
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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timer.c
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Abstract:
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Work Items Timer
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Author:
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Stefan Solomon 07/20/1995
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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#define TimerHandle hWaitableObject[TIMER_HANDLE]
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LIST_ENTRY TimerQueue;
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/*++
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Function: StartWiTimer
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Descr: Inserts a work item in the timer queue for the specified time
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Remark: has to take and release the queues lock
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--*/
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VOID
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StartWiTimer(PWORK_ITEM reqwip,
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ULONG timeout) // milliseconds
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{
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PLIST_ENTRY lep;
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PWORK_ITEM timqwip;
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ULONG delay;
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LONGLONG to;
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BOOL rc;
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reqwip->DueTime = GetTickCount() + timeout;
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ACQUIRE_QUEUES_LOCK;
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lep = TimerQueue.Blink;
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while(lep != &TimerQueue)
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{
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timqwip = CONTAINING_RECORD(lep, WORK_ITEM, Linkage);
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if(IsLater(reqwip->DueTime, timqwip->DueTime)) {
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break;
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}
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lep = lep->Blink;
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}
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InsertHeadList(lep, &reqwip->Linkage);
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reqwip->WiState = WI_WAITING_TIMEOUT;
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if(lep == &TimerQueue) {
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delay = reqwip->DueTime - GetTickCount();
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if(delay > MAXULONG/2) {
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// already happened
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to = 0;
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}
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else
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{
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to = ((LONGLONG)delay) * (-10000);
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}
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rc = SetWaitableTimer(TimerHandle,
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(PLARGE_INTEGER)&to,
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0, // signal once
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NULL, // no completion routine
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NULL,
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FALSE);
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if(!rc) {
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Trace(TIMER_TRACE, "Cannot start waitable timer %d\n", GetLastError());
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}
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}
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RELEASE_QUEUES_LOCK;
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}
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/*++
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Function: ProcessTimerQueue
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Descr: called when the timer queue due time has come.
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Dequeues all wi with expired timeout and queues them in the
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workers work items queue
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Remark: has to take and release the queues lock
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--*/
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VOID
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ProcessTimerQueue(VOID)
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{
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ULONG currTime = GetTickCount();
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ULONG dueTime = currTime + MAXULONG/2;
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PWORK_ITEM wip;
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FILETIME filetime;
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LONGLONG to;
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DWORD rc;
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ACQUIRE_QUEUES_LOCK;
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while(!IsListEmpty(&TimerQueue))
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{
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// check the first in the list
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wip = CONTAINING_RECORD(TimerQueue.Flink, WORK_ITEM, Linkage);
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if(IsLater(currTime, wip->DueTime)) {
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RemoveEntryList(&wip->Linkage);
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wip->WiState = WI_TIMEOUT_COMPLETED;
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EnqueueWorkItemToWorker(wip);
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}
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else
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{
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dueTime = wip->DueTime;
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break;
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}
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}
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to = ((LONGLONG)(dueTime - currTime)) * (-10000);
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rc = SetWaitableTimer(
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TimerHandle,
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(PLARGE_INTEGER)&to,
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0, // signal once
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NULL, // no completion routine
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NULL,
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FALSE);
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if(!rc) {
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Trace(TIMER_TRACE, "Cannot start waitable timer %d\n", GetLastError());
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}
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RELEASE_QUEUES_LOCK;
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}
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/*++
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Function: StopWiTimer
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Descr: remove from the timer queue all the work items referencing this adapter
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and insert them in the workers queue
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Remark: takes the queues lock
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--*/
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VOID
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StopWiTimer(PACB acbp)
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{
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PWORK_ITEM wip;
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PLIST_ENTRY lep;
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ACQUIRE_QUEUES_LOCK;
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lep = TimerQueue.Flink;
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while(lep != &TimerQueue) {
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wip = CONTAINING_RECORD(lep, WORK_ITEM, Linkage);
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lep = lep->Flink;
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if(wip->acbp == acbp) {
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RemoveEntryList(&wip->Linkage);
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wip->WiState = WI_TIMEOUT_COMPLETED;
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EnqueueWorkItemToWorker(wip);
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}
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}
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RELEASE_QUEUES_LOCK;
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}
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