The ExAcquireSpinLockExclusiveAtDpcLevel routine acquires a spin lock for exclusive access by a caller that is already running at IRQL >= DISPATCH_LEVEL.
- SpinLock [in, out]
A pointer to the spin lock to acquire. The caller must not already own this spin lock.
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.
Note Recursive acquisition of a spin lock causes deadlock and is not allowed.
|Available starting with Windows Vista with SP1.|
|>= DISPATCH_LEVEL (See Remarks.)|