• Drivers Hand Held Products Port Devices Used
• Drivers Hand Held Products Port Devices Available

The StorPortAcquireSpinLock routine acquires the specified spin lock.

Syntax

Parameters

DeviceExtension

[in]A pointer to the miniport driver per-adapter device extension.

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SpinLock

Download green hills software driver. [in]Contains an enumerator value of type STOR_SPINLOCK that specifies the spin lock to acquire.

LockContext

[in]A pointer to the DPC object for which the lock is held if SpinLock indicates a type of DpcLock. This member should be NULL if SpinLock indicates a type of either InterruptLock or StartIoLock.

LockHandle

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[in, out]A pointer to a buffer that, on return, will contain a lock handle. To release the lock, the caller must pass this handle to the StorPortReleaseSpinLock routine.

Return value

None

Remarks

Miniport drivers must ensure that they do not attempt to acquire a lock that is already held or acquire locks in an incorrect order. Either of these mistakes will result in system deadlock.

Certain locks are held automatically by the port driver before it calls the miniport driver callback routines. For each miniport driver callback routine, the following table indicates which locks the port driver acquires automatically before calling the callback routine.

Drivers Hand Held Products Port Devices Used

The locks held by the port driver influence which locks the callback routines are allowed to acquire, because spin locks must be acquired in the following order:

• DPC or StartIo
• Interrupt

For instance, if the port driver acquires the Interrupt spin lock before calling a callback routine, that callback routine can no longer acquire the DPC or StartIo spin lock because the DPC and StartIo spin locks are of a lower order than the Interrupt spin lock. On the other hand, if the port driver acquires the StartIo spin lock before calling a callback routine, that callback routine, when executed, could still acquire an Interrupt or a DPC spin lock.

The following table indicates which spin locks each miniport driver routine can acquire. In those cases where the miniport driver routine must obtain both the StartIo spin lock and the Interrupt spin lock, the routine must always acquire the StartIo spin lock first.

Requirements

Drivers Hand Held Products Port Devices Available

See also