146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
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/*++
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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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Timer thread to monitor connection progress in the
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automatic connection driver (acd.sys).
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Author:
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Anthony Discolo (adiscolo) 25-Apr-1995
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Environment:
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Kernel Mode
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Revision History:
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--*/
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#include <ndis.h>
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#include <cxport.h>
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#include <tdi.h>
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#include <tdikrnl.h>
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#include <tdistat.h>
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#include <tdiinfo.h>
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#include <acd.h>
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#include "acdapi.h"
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#include "table.h"
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#include "acddefs.h"
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#include "debug.h"
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//
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// Imported routines.
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//
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VOID
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AcdSignalCompletionCommon(
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IN PACD_CONNECTION pConnection,
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IN BOOLEAN fSuccess
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);
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//
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// Keep track how long the user-space
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// process has been attempting a connection.
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//
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#define ACD_MAX_TIMER_CALLS 3*60 // 3 minutes
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//
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// We give the user-space process
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// some slack on missed pings.
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//
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#define ACD_MAX_MISSED_PINGS 40 // 20 seconds
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VOID
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AcdConnectionTimer(
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IN PDEVICE_OBJECT pDeviceObject,
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IN PVOID pContext
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)
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{
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PLIST_ENTRY pEntry;
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PACD_CONNECTION pConnection;
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BOOLEAN bCancel = FALSE;
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//
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// Acquire the spin lock.
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// We're guaranteed to be at DPC
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// since this is a timer routine.
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//
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KeAcquireSpinLockAtDpcLevel(&AcdSpinLockG);
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//
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// If the user-space process responsible
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// for creating the connection hasn't
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// pinged us in a while, or if it hasn't
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// created a connection in 3 minutes,
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// cancel all the pending requests.
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//
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for (pEntry = AcdConnectionQueueG.Flink;
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pEntry != &AcdConnectionQueueG;
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pEntry = pEntry->Flink)
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{
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pConnection = CONTAINING_RECORD(pEntry, ACD_CONNECTION, ListEntry);
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IF_ACDDBG(ACD_DEBUG_TIMER) {
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PACD_COMPLETION pCompletion;
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AcdPrint((
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"AcdConnectionTimer: pConnection=0x%x, fNotif=%d, szAddr=",
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pConnection,
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pConnection->fNotif));
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pCompletion = CONTAINING_RECORD(pConnection->CompletionList.Flink, ACD_COMPLETION, ListEntry);
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AcdPrintAddress(&pCompletion->notif.addr);
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AcdPrint((", nTimerCalls=%d, nMissedPings=%d\n",
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pConnection->ulTimerCalls,
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pConnection->ulMissedPings));
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}
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//
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// If we haven't reported the connection to
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// user space yet, or it is in the process of
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// being completed, then don't time it out.
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//
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if (!pConnection->fNotif || pConnection->fCompleting)
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continue;
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pConnection->ulTimerCalls++;
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if (pConnection->fProgressPing)
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pConnection->ulMissedPings = 0;
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else
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pConnection->ulMissedPings++;
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if (pConnection->ulTimerCalls >= ACD_MAX_TIMER_CALLS ||
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pConnection->ulMissedPings >= ACD_MAX_MISSED_PINGS)
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{
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IF_ACDDBG(ACD_DEBUG_TIMER) {
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AcdPrint((
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"AcdConnectionTimer: canceling pConnection=0x%x\n",
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pConnection));
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}
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//
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// Set the completion-in-progress flag so
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// this request cannot be completed after
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// we release the spin lock.
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//
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pConnection->fCompleting = TRUE;
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bCancel = TRUE;
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break;
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}
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}
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//
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// Release the spin lock.
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//
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KeReleaseSpinLockFromDpcLevel(&AcdSpinLockG);
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//
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// We now process all the canceled requests.
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//
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if (bCancel)
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AcdSignalCompletionCommon(pConnection, FALSE);
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} // AcdConnectionTimer
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