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49f967d0ed
I double checked, but in case someone's recent commit is somehow overwritten -- please, don't be very frustrated :) -- I will fix it, just drop me a note. svn path=/trunk/; revision=7338
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* $Id: timer.c,v 1.11 2003/12/30 18:52:04 fireball Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/io/timer.c
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* PURPOSE: io timers
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* PROGRAMMER: David Welch (welch@mcmail.com)
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* UPDATE HISTORY:
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* Created 22/05/98
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*/
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/* INCLUDES *****************************************************************/
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#include <ddk/ntddk.h>
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#include <internal/pool.h>
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#define NDEBUG
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#include <internal/debug.h>
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/* GLBOALS *******************************************************************/
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#define TAG_IO_TIMER TAG('I', 'O', 'T', 'M')
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/* FUNCTIONS *****************************************************************/
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static VOID STDCALL
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IoTimerCallback(IN PKDPC Dpc,
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IN PVOID DeferredContext,
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IN PVOID SystemArgument1,
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IN PVOID SystemArgument2)
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{
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PIO_TIMER Timer = (PIO_TIMER) DeferredContext;
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Timer->TimerRoutine(Timer->DeviceObject, Timer->Context);
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}
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/*
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* @implemented
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*/
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NTSTATUS
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STDCALL
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IoInitializeTimer(PDEVICE_OBJECT DeviceObject,
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PIO_TIMER_ROUTINE TimerRoutine,
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PVOID Context)
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/*
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* FUNCTION: Sets up a driver-supplied IoTimer routine associated with a given
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* device object
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* ARGUMENTS:
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* DeviceObject = Device object whose timer is be initialized
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* TimerRoutine = Driver supplied routine which will be called once per
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* second if the timer is active
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* Context = Driver supplied context to be passed to the TimerRoutine
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* RETURNS: Status
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*/
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{
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DeviceObject->Timer = ExAllocatePoolWithTag(NonPagedPool, sizeof(IO_TIMER),
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TAG_IO_TIMER);
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DeviceObject->Timer->DeviceObject = DeviceObject;
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DeviceObject->Timer->TimerRoutine = TimerRoutine;
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DeviceObject->Timer->Context = Context;
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KeInitializeTimer(&(DeviceObject->Timer->timer));
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KeInitializeDpc(&(DeviceObject->Timer->dpc),
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IoTimerCallback, DeviceObject->Timer);
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return(STATUS_SUCCESS);
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}
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/*
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* @implemented
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*/
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VOID
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STDCALL
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IoStartTimer(PDEVICE_OBJECT DeviceObject)
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/*
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* FUNCTION: Starts a timer so the driver-supplied IoTimer routine will be
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* called once per second
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* ARGUMENTS:
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* DeviceObject = Device whose timer is to be started
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*/
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{
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LONGLONG lli;
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LARGE_INTEGER li;
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lli = -1000000;
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li = *(LARGE_INTEGER *)&lli;
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KeSetTimerEx(&DeviceObject->Timer->timer,
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li,
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1000,
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&(DeviceObject->Timer->dpc));
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}
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/*
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* @implemented
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*/
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VOID
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STDCALL
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IoStopTimer(PDEVICE_OBJECT DeviceObject)
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/*
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* FUNCTION: Disables for a specified device object so the driver-supplied
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* IoTimer is not called
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* ARGUMENTS:
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* DeviceObject = Device whose timer is to be stopped
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*/
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{
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KeCancelTimer(&(DeviceObject->Timer->timer));
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}
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/* EOF */
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