NdisReleaseSpinLock macro (ndis.h)

Article
02/22/2024

The NdisReleaseSpinLock function releases a spin lock that was acquired in a preceding call to the NdisAcquireSpinLock function.

Syntax

void NdisReleaseSpinLock(
  [in]  _SpinLock
);

Parameters

[in] _SpinLock

Pointer to the acquired spin lock to be released.

Return value

None

Remarks

A driver must initialize its spin lock with NdisAllocateSpinLock before it calls any other Ndis..SpinLock function to access the resources protected by that spin lock.

A driver must call NdisAcquireSpinLock to acquire the spin lock before it can call NdisReleaseSpinLock. Each call to NdisAcquireSpinLock requires a reciprocal call to NdisReleaseSpinLock before the driver can call NdisAcquireSpinLock again.

NdisReleaseSpinLock restores the original IRQL at which its caller was running before the call to NdisAcquireSpinLock.

Any spin lock acquired with NdisAcquireSpinLock must be released with NdisReleaseSpinLock. Any spin lock acquired with NdisDprAcquireSpinLock must be released with NdisDprReleaseSpinLock.

For more information about acquiring and releasing NDIS spin locks, see Synchronization and Notification in Network Drivers.

Requirements

Requirement	Value
Minimum supported client	Supported for NDIS 6.0 and NDIS 5.1 drivers (see NdisReleaseSpinLock (NDIS 5.1)) in Windows Vista. Supported for NDIS 5.1 drivers (see NdisReleaseSpinLock (NDIS 5.1)) in Windows XP.
Target Platform	Universal
Header	ndis.h (include Ndis.h)
Library	Ndis.lib
IRQL	DISPATCH_LEVEL
DDI compliance rules	Irql_Synch_Function(ndis), SpinLock(ndis), SpinLockBalanced(ndis), SpinLockDpr(ndis), SpinLockDprRelease(ndis), SpinlockRelease(ndis)