结束线程的问题

按照walter的方法,结束线程时发送事件,
我是这么运用的,在DriverEntry中startthread,在DriverUnload中stopthread,但是问题是DriverUnload的参数是没有设备扩展的,这么操作那个事件?
walter的例子:
typedef struct _DEVICE_EXTENSION {

  KEVENT evKill;
  PKTHREAD thread;
  };

NTSTATUS StartThread(PDEVICE_EXTENSION pdx)
  {
  NTSTATUS status;
  HANDLE hthread;
  OBJECT_ATTRIBUTES oa;
  InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE,
    NULL, NULL);
  status = PsCreateSystemThread(&hthread, THREAD_ALL_ACCESS,
    &oa, NULL, NULL, (PKSTART_ROUTINE) ThreadProc, pdx);
  if (!NT_SUCCESS(status))
    return status;
  ObReferenceObjectByHandle(hthread, THREAD_ALL_ACCESS, NULL,
    KernelMode, (PVOID*) &pdx->thread, NULL);
  ZwClose(hthread);
  return STATUS_SUCCESS;
  }

VOID StopThread(PDEVICE_EXTENSION pdx)
  {
  KeSetEvent(&pdx->evKill, 0, FALSE);
  KeWaitForSingleObject(pdx->thread, Executive,
    KernelMode, FALSE, NULL);
  ObDereferenceObject(pdx->thread);
  }

VOID ThreadProc(PDEVICE_EXTENSION pdx)
  {

  KeWaitForXxx(<at least pdx->evKill>);

  PsTerminateSystemThread(STATUS_SUCCESS);
  }


我的运用

NTSTATUS
DriverEntry(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
{
    PDEVICE_OBJECT DeviceObject = NULL;
    PDEVICE_EXTENSION DeviceExtension;
 ....
    ntStatus = IoCreateDevice(
DriverObject,
sizeof(DEVICE_EXTENSION), // DeviceExtensionSize
&ntDeviceName, // DeviceName
FILE_DEVICE, // DeviceType
0, // DeviceCharacteristics
TRUE, // Exclusive
&DeviceObject // [OUT]
);
DeviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;
.....
Startthread(DeviceExtension);
}

DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
//只有 DriverObject怎么操作那个DeviceExtension?
//是不是就是那个(DriverObject->DeviceObject)->DeviceExtension?
}




[编辑 -  11/27/04 by  pwpwpw123]

[编辑 -  11/27/04 by  pwpwpw123]

[编辑 -  11/27/04 by  pwpwpw123]

Could you try to StartThread in AddDevice and StopThread when IRP_MN_STOP_DEVICE as ananda recommented? StartThread in DriverEntry might cause re-entry problem if there are multiple devices installed. Certainly, if you want it to be global, being used by multiple device instances, your design is the only way.

在这个 IRP_MN_STOP_DEVICE irp时stopthread

VOID
Unload(
    IN PDRIVER_OBJECT DriverObject
    )
{
StopThread(DriverObject->DeviceObject)->DeviceExtension)
IoDeleteSymbolicLink(...)
IoDeleteDevice( DriverObject->DeviceObject);
...
}

全局变量不能用么.....

其他地方肯定可以阿

在unload的时候通常设备对象都已经删除了
所以(DriverObject->DeviceObject)->DeviceExtension应该不行。
为什么一定要在unload的时候停止线程呢，其它的地方不行吗

StopThread(DeviceObject->DeviceExtension）