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INTR_BARRIER(9) Kernel Developer's Manual INTR_BARRIER(9)

intr_barrier —
interrupt barrier

#include <machine/intr.h>

void
intr_barrier(void *ih);

This function guarantees that any interrupt handler invocations for the interrupt handler specified by ih has finished before it returns. The cookie passed to intr_barrier() should be the value returned when the interrupt handler was established, for example the return value of pci_intr_establish(9).

intr_barrier() can be called from process context.

pci_intr_establish(9), spl(9)
September 13, 2015 OpenBSD-current