258 lines
5.1 KiB
C
258 lines
5.1 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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scavthrd.c
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Abstract:
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This module implements the scavenger thread and its dispatch.
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Author:
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Joe Linn [JoeLinn] 19-aug-1994
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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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#include "scavthrd.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (RDBSS_BUG_CHECK_SCAVTHRD)
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//
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// The local debug trace level
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//
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#define Dbg (DEBUG_TRACE_SCAVTHRD)
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//
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// This counter is used to control kicking the scavenger thread.
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//
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LONG RxTimerCounter;
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ULONG RxTimerCounterPeriod = RX_TIMER_COUNTER_PERIOD;
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//WORK_QUEUE_ITEM CancelWorkItem;
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WORK_QUEUE_ITEM TimerWorkItem;
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,RxTimer)
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#endif
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VOID
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RxTimer (
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IN PVOID Context
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)
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/*++
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Routine Description:
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This function implements the NT redirector's scavenger thread. It performs idle time operations
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such as closing out dormant connections etc. It is run on an executive worker thread from the
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delayed queue as can be seen below.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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PAGED_CODE();
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RxDbgTrace(0, (DEBUG_TRACE_SHUTDOWN), ("RxTimer\n", 0)); //joejoe shutdown may be a bad choice
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TimerWorkItem.List.Flink = NULL; // this is used to specifically signal a requeueable state
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/* this is larry's old code
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//
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// First scan for dormant connections to remove.
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//
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RxScanForDormantConnections(0, NULL);
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//RxScanForDormantSecurityEntries();
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//
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// Now check the list of open outstanding files and remove any that are
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// "too old" from the cache.
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//
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RxPurgeDormantCachedFiles();
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//
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// Request updated throughput, delay and reliability information from the
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// transport for each connection.
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//
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RxEvaluateTimeouts();
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//
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// Now "PING" remote servers for longterm requests that have been active
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// for more than the timeout period.
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//
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RxPingLongtermOperations();
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*/
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UNREFERENCED_PARAMETER(Context);
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}
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VOID
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RxIdleTimer (
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IN PDEVICE_OBJECT DeviceObject,
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IN PVOID Context
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)
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/*++
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Routine Description:
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This routine is the Timer DPC for the scavenger timer. What happens is that it down to the period value
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and then queues an executive work item to the delayed queue.
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Arguments:
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IN PDEVICE_OBJECT DeviceObject - Supplies the device object for the timer
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IN PVOID Context - Ignored in this routine.
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Return Value:
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None.
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--*/
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{
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RxElapsedSecondsSinceStart++; //keep running count of the elapsed time
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//
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// Check to see if it's time ttime to do anything
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//joejoe we should specifically have something to do before we trot off but not now
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if (--RxTimerCounter <= 0) {
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RxTimerCounter = RxTimerCounterPeriod;
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// / //
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// / // If there are any outstanding commands, check to see if they've
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// / // timed out.
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// / //
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// / if (RxStatistics.CurrentCommands != 0) {
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// / //
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// / // Please note that we use the kernel work queue routines directly for
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// / // this instead of going through the normal redirector work queue
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// / // routines. We do this because the redirector work queue routines will
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// / // only allow a limited number of requests through to the worker threads,
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// / // and it is critical that this request run (if it didn't, there could be
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// / // a worker thread that was blocked waiting on the request to be canceled
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// / // could never happen because the cancelation routine was behind it on
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// / // the work queue.
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// / //
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// / if (CancelWorkItem.List.Flink == NULL) {
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// / RxQueueWorkItem(&CancelWorkItem, CriticalWorkQueue);
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// / }
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// / }
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//
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// Queue up a scavenger request to a worker thread if the quy is not already enqueued.
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//
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if (TimerWorkItem.List.Flink == NULL) {
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// RxQueueWorkItem(&TimerWorkItem, DelayedWorkQueue);
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RxQueueWorkItem( &TimerWorkItem, DelayedWorkQueue );
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}
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}
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return;
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UNREFERENCED_PARAMETER(DeviceObject);
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UNREFERENCED_PARAMETER(Context);
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}
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VOID
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RxInitializeScavenger (
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VOID
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)
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/*++
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Routine Description:
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Initialize workitems, timers, counters to implement the dispatch to the RxTimer routine.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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RxInitializeWorkItem( &TimerWorkItem, RxTimer, NULL );
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// RxInitializeWorkItem( &CancelWorkItem, RxCancelOutstandingRequests, NULL );
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//
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// Set the timer up for the idle timer.
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//
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RxElapsedSecondsSinceStart = 0;
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RxTimerCounter = RxTimerCounterPeriod;
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IoInitializeTimer((PDEVICE_OBJECT)RxFileSystemDeviceObject, RxIdleTimer, NULL);
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IoStartTimer((PDEVICE_OBJECT)RxFileSystemDeviceObject);
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return;
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}
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VOID
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RxUninitializeScavenger (
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VOID
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)
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/*++
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Routine Description:
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Stops the timer used to dispatch to the RxTimer routine.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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IoStopTimer((PDEVICE_OBJECT)RxFileSystemDeviceObject);
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return;
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}
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