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IoAcquireRemoveLock routine

The IoAcquireRemoveLock routine increments the count for a remove lock, indicating that the associated device object should not be detached from the device stack or deleted.


NTSTATUS IoAcquireRemoveLock(
  _In_      PIO_REMOVE_LOCK RemoveLock,
  _In_opt_  PVOID Tag


RemoveLock [in]

Pointer to an IO_REMOVE_LOCK structure that the caller initialized with a previous call to IoInitializeRemoveLock.

Tag [in, optional]

Optionally points to a caller-supplied tag that identifies this instance of acquiring the remove lock. For example, a driver Dispatch routine typically sets this parameter to a pointer to the IRP the routine is processing.

If a driver specifies a Tag on a call to IoAcquireRemoveLock, the driver must supply the same Tag in the corresponding call to IoReleaseRemoveLock.

The Tag does not have to be unique, but should be something meaningful during debugging.

The I/O system uses this parameter on checked builds only.

Return value

IoAcquireRemoveLock returns STATUS_SUCCESS if the call was successful. One possible error return value is the following:


The driver has received an IRP_MN_REMOVE_DEVICE for the device and has called IoReleaseRemoveLockandWait. That routine is waiting for all remove locks to clear before returning control to the driver.

If the routine returns any value besides STATUS_SUCCESS, do not start any new operations on the device.


A driver must initialize a remove lock with a call to IoInitializeRemoveLock before using the lock.

A driver must call IoReleaseRemoveLock to release the lock when it is no longer needed.

For more information, see Using Remove Locks.



Available starting with Windows 2000.


Wdm.h (include Wdm.h, Ntddk.h, or Ntifs.h)





DDI compliance rules

MarkDevicePower, MarkPower, MarkPowerDown, MarkQueryRelations, MarkStartDevice, MultRemoveLock, PowerDownAllocate, PowerDownFail, PowerUpFail, RemoveLock, RemoveLockCheck, RemoveLockForward, RemoveLockForward2, RemoveLockForwardDeviceControl, RemoveLockForwardDeviceControl2, RemoveLockForwardDeviceControlInternal, RemoveLockForwardDeviceControlInternal2, RemoveLockForwardRead, RemoveLockForwardRead2, RemoveLockForwardWrite, RemoveLockForwardWrite2, RemoveLockMnRemove, RemoveLockMnSurpriseRemove, RemoveLockQueryMnRemove, RemoveLockRelease2, RemoveLockReleaseCleanup, RemoveLockReleaseClose, RemoveLockReleaseCreate, RemoveLockReleaseDeviceControl, RemoveLockReleaseInternalDeviceControl, RemoveLockReleasePnp, RemoveLockReleasePower, RemoveLockReleaseRead, RemoveLockReleaseShutdown, RemoveLockReleaseSystemControl, RemoveLockReleaseWrite, WmiForward

See also




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