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ExReleaseSpinLockExclusive function (wdm.h)

  • Article

The ExReleaseSpinLockExclusive routine releases a spin lock that the caller previously acquired for exclusive access, and restores the IRQL to its original value.

Syntax

void ExReleaseSpinLockExclusive(
  [in, out] PEX_SPIN_LOCK SpinLock,
  [in]      KIRQL         OldIrql
);

Parameters

[in, out] SpinLock

A pointer to the spin lock to release. The caller must own this spin lock for exclusive access.

[in] OldIrql

The interrupt request level (IRQL) to restore. Set this parameter to the KIRQL value that was returned by the ExAcquireSpinLockExclusive call that acquired the spin lock.

Return value

None

Remarks

This routine must be called only for a spin lock that is owned by the caller.

On entry to this routine, the caller must be running at IRQL = DISPATCH_LEVEL. Before exiting, ExReleaseSpinLockExclusive restores the IRQL to the value specified by the OldIrql parameter.

The caller should hold the spin lock only briefly before releasing it. For more information, see Introduction to Spin Locks.

Requirements

Requirement Value
Minimum supported client Available starting with Windows Vista with SP1.
Target Platform Universal
Header wdm.h
IRQL DISPATCH_LEVEL (See Remarks.)

See also

ExAcquireSpinLockExclusive