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This function acquires a spin lock so that the caller gains exclusive access to the resources, shared among driver functions, that the spin lock protects.
VOID NdisAcquireSpinLock( IN PNDIS_SPIN_LOCK SpinLock );
In Windows CE, NDIS spin locks are implemented using critical sections.
The driver must initialize a variable of type NDIS_SPIN_LOCK with the NdisAllocateSpinLockfunction before it calls any other NDIS SpinLockfunction. The driver must provide resident storage for the spin lock(s) it uses.
After acquiring a spin lock with this function, the caller releases that lock with a call to the NdisReleaseSpinLockfunction. A driver must call NdisReleaseSpinLockfollowing each call to this function. Otherwise, a deadlock occurs, hanging the driver.
A spin lock acquired with the NdisDprAcquireSpinLockfunction must be released with the NdisDprReleaseSpinLockfunction.
A driver should never hold a spin lock for an extended period — more than a few instructions. Holding a spin lock for longer than 25 microseconds degrades both system and driver performance.
A miniport driver cannot use a spin lock to protect resources that its other functions share with the MiniportISRand/or the MiniportDisableInterruptfunctions. Instead, a miniport must call the NdisMSynchronizeWithInterruptfunction so that its MiniportSynchronizeISRfunction accesses such shared resources at the same DIRQL at which its MiniportISRand/or MiniportDisableInterruptfunctions do.
A driver that calls this function runs at IRQL <=DISPATCH_LEVEL.
|Runs on||Versions||Defined in||Include||Link to|
|Windows CE OS||2.0 and later||Ndis.h|
Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.
Last updated on Tuesday, July 13, 2004