InterruptUnlock()

Release a critical section in an interrupt handler

Synopsis:

#include <sys/neutrino.h>

void InterruptUnlock( intrspin_t* spinlock );

Arguments:

spinlock

The spinlock (a variable shared between the interrupt handler and a thread) used in a call to InterruptLock() to lock the handler.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The InterruptUnlock() function releases a critical section by unlocking the specified spinlock, reenabling interrupts. You can call this function from a thread or from an interrupt handler.

Before calling this function, the thread must request I/O privileges by calling:

ThreadCtl( _NTO_TCTL_IO, 0 );

If the thread doesn't do this, it might SIGSEGV when it calls InterruptUnlock().

Classification:

QNX Neutrino

See also:

InterruptDisable(), InterruptEnable(), InterruptLock(), InterruptMask(), InterruptUnmask(), ThreadCtl()

Writing an Interrupt Handler chapter of the Neutrino Programmer's Guide

Interrupts chapter of Getting Started with QNX Neutrino