IoAcquireRemoveLock function

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.

Syntax

void IoAcquireRemoveLock(
   RemoveLock,
   Tag
);

Parameters

RemoveLock

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

Tag

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

None

Remarks

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.

Requirements

   
Windows version Available starting with Windows 2000.
Target Platform Desktop
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL "<= DISPATCH_LEVEL"
DDI compliance rules CompleteRequestStatusCheck, MarkDevicePower, MarkPower, MarkPowerDown, MarkQueryRelations, MarkStartDevice, MultRemoveLock, NsRemoveLockMnRemove, NsRemoveLockMnSurpriseRemove, NsRemoveLockQueryMnRemove, PowerDownAllocate, PowerDownFail, PowerUpFail, RemoveLock, RemoveLockCheck, RemoveLockForward, RemoveLockForward2, RemoveLockForwardDeviceControl, RemoveLockForwardDeviceControl2, RemoveLockForwardDeviceControlInternal, RemoveLockForwardDeviceControlInternal2, RemoveLockForwardRead, RemoveLockForwardRead2, RemoveLockForwardWrite, RemoveLockForwardWrite2, RemoveLockMnRemove, RemoveLockMnRemove2, RemoveLockMnSurpriseRemove, RemoveLockQueryMnRemove, RemoveLockRelease2, RemoveLockReleaseCleanup, RemoveLockReleaseClose, RemoveLockReleaseCreate, RemoveLockReleaseDeviceControl, RemoveLockReleaseInternalDeviceControl, RemoveLockReleasePnp, RemoveLockReleasePower, RemoveLockReleaseRead, RemoveLockReleaseShutdown, RemoveLockReleaseSystemControl, RemoveLockReleaseWrite, WmiForward

See Also

IoInitializeRemoveLock

IoReleaseRemoveLock

IoReleaseRemoveLockAndWait