ExAcquireSpinLockExclusiveAtDpcLevel function (wdm.h)
The ExAcquireSpinLockExclusiveAtDpcLevel routine acquires a spin lock for exclusive access by a caller that is already running at IRQL >= DISPATCH_LEVEL.
Syntax
void ExAcquireSpinLockExclusiveAtDpcLevel(
[in, out] PEX_SPIN_LOCK SpinLock
);
Parameters
[in, out] SpinLock
A pointer to the spin lock to acquire. The caller must not already own this spin lock.
Return value
None
Remarks
On entry to this routine, the caller must be running at IRQL >= DISPATCH_LEVEL. This routine does not change the IRQL.
To release the spin lock, the driver calls the ExReleaseSpinLockExclusiveFromDpcLevel routine.
A spin lock is a 32-bit variable of type EX_SPIN_LOCK. The driver must allocate the storage for the spin lock and initialize the spin lock to zero. This storage must be located in nonpaged system-space memory.
The caller should hold the spin lock only briefly before releasing it. For more information, see Introduction to Spin Locks.
Recursive acquisition of a spin lock causes deadlock and is not allowed.
Requirements
| Requirement | Value |
|---|---|
| Header | wdm.h |
| IRQL | IRQL >= DISPATCH_LEVEL |