188 lines
3.3 KiB
C
188 lines
3.3 KiB
C
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/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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blkwork.c
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Abstract:
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This module implements routines for managing work context blocks.
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Author:
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Chuck Lenzmeier (chuckl) 9-Feb-1994
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Revision History:
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--*/
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#include "precomp.h"
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#include "blktimer.tmh"
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#pragma hdrstop
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#define BugCheckFileId SRV_FILE_BLKTIMER
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, SrvAllocateTimer )
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#pragma alloc_text( PAGE, SrvCancelTimer )
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#pragma alloc_text( PAGE, SrvSetTimer )
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#endif
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PSRV_TIMER
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SrvAllocateTimer (
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VOID
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)
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/*++
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Routine Description:
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This routine allocates a timer structure.
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Arguments:
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None.
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Return Value:
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PSRV_TIMER -- pointer to the allocated timer structure, or NULL.
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--*/
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{
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PSINGLE_LIST_ENTRY entry;
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PSRV_TIMER timer;
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PAGED_CODE( );
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entry = ExInterlockedPopEntrySList( &SrvTimerList, &GLOBAL_SPIN_LOCK(Timer) );
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if ( entry == NULL ) {
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timer = ALLOCATE_NONPAGED_POOL( sizeof(SRV_TIMER), BlockTypeTimer );
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if ( timer != NULL ) {
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KeInitializeEvent( &timer->Event, NotificationEvent, FALSE );
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KeInitializeTimer( &timer->Timer );
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}
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} else {
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timer = CONTAINING_RECORD( entry, SRV_TIMER, Next );
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}
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return timer;
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} // SrvAllocateTimer
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VOID
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SrvCancelTimer (
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PSRV_TIMER Timer
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)
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/*++
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Routine Description:
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This routine cancels a timer.
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Arguments:
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Timer -- pointer to the timer
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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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//
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// Cancel the timer.
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//
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if ( !KeCancelTimer( &Timer->Timer ) ) {
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//
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// We were unable to cancel the timer. This means that the
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// timer routine has either already run or is scheduled to run.
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// We need to wait for the timer routine to complete before we
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// continue.
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//
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// We expect that if we couldn't cancel the timer (which
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// shouldn't happen often), then the timer routine has probably
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// already completed, so we call KeReadStateEvent first to avoid
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// the overhead of KeWaitForSingleObject.
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//
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if ( !KeReadStateEvent( &Timer->Event ) ) {
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KeWaitForSingleObject(
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&Timer->Event,
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UserRequest,
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KernelMode, // don't let kernel stack be paged
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FALSE, // not alertable
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NULL // no timeout
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);
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}
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}
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return;
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} // SrvCancelTimer
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VOID
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SrvSetTimer (
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IN PSRV_TIMER Timer,
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IN PLARGE_INTEGER Timeout,
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IN PKDEFERRED_ROUTINE TimeoutHandler,
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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 starts a timer.
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Arguments:
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Timer -- pointer to the timer
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Timeout -- number of milliseconds to wait
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TimeoutHandler -- routine to call if the timer expires
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Context -- context value for the timer routine
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Return Value:
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None.
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--*/
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{
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PRKDPC Dpc = &Timer->Dpc;
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PAGED_CODE( );
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//
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// Initialize the DPC associated with the timer. Reset the event
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// that indicates that the timer routine has run. Set the timer.
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//
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KeInitializeDpc( Dpc, TimeoutHandler, Context );
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KeSetTargetProcessorDpc( Dpc, (CCHAR)KeGetCurrentProcessorNumber() );
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KeClearEvent( &Timer->Event );
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KeSetTimer( &Timer->Timer, *Timeout, Dpc );
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return;
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} // SrvSetTimer
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