How to achieve interrupt

getasif · 07-30-2011, 08:59 AM

how to achieve interrupts

any sources available apart from kernel code which show the usage of

void enable_irq(int irq);
void disable_irq(int irq);
void disable_irq_nosync(int irq);

thanks and regards

smallpond · 08-01-2011, 12:53 PM

Quote:

Originally Posted by getasif

how to achieve interrupts

any sources available apart from kernel code which show the usage of

void enable_irq(int irq);
void disable_irq(int irq);
void disable_irq_nosync(int irq);

thanks and regards

Most of the kernel is written for SMP systems.
If you have multiple CPUs, disable_irq doesn't protect you from another CPU running.
Most driver code uses spin_lock_irqsave and spin_lock_irq_restore instead.
Tutorial is here:
http://www.kernel.org/pub/linux/kern...ing/index.html

sundialsvcs · 08-01-2011, 08:18 PM

Obviously, there is no "code, apart from kernel code," that would ever use (or, could ever use...) these programming constructs.