ScsiPortStallExecution

VOID
ScsiPortStallExecution(
IN ULONG Delay
);

ScsiPortStallExecution stalls in the miniport driver.

Parameters

Delay: Specifies the delay interval in microseconds. The given value must be less than a full millisecond.

Comments

ScsiPortStallExecution should be called as seldom as possible and the total stall time in a miniport driver routine must be less than one millisecond. This call ties up a processor, doing no useful work while stalling in the driver.

In general, a miniport should call ScsiPortStallExecution only if the driver must wait for a state change on the HBA that cannot cause an interrupt, or if the driver must delay for a very short interval between accesses to the HBA.

If a miniport’s HwScsiInterrupt routine must stall between accesses to the HBA and the total delay time in the ISR might be more than one millisecond, HwScsiInterrupt should call ScsiPortNotification with the NotificationType CallEnableInterrupts instead of calling ScsiPortStallExecution. Such a miniport has a pair of HwScsi..InterruptsCallback routines to manage its interrupt-driven I/O processing without tying up a processor and degrading the I/O performance of other HBAs that miniport driver might support in the same machine.

A miniport-supplied HwScsiTimer routine also can be passed in calls to ScsiPortNotification with a specified interval that is not limited to one millisecond.