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Writing SynchCritSection Routines

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Drivers use their SynchCritSection routines for either of two basic purposes:

Programming a device for an I/O operation

Accessing shared state information

Like an ISR, a SynchCritSection routine must execute as quickly as possible, doing only what is necessary to set up device registers or update context data, before returning.

Because KeSynchronizeExecution holds a device driver's interrupt spin lock while its SynchCritSection routine runs, the driver's ISR cannot execute until the SynchCritSection routine returns control.

For any received IRP, a device driver should do as much I/O processing as possible either at IRQL PASSIVE_LEVEL in its dispatch routines (or possibly device-dedicated threads), or at IRQL DISPATCH_LEVEL in its StartIo routine and DPC routines.

For additional information about how critical sections are synchronized, see Using Spin Locks: An Example.