Interface for asynchronous ISR handlers.

This interface has just two (main) functions. More...

Collaboration diagram for Interface for asynchronous ISR handlers.:

Topics
	Interface for asynchronous ISR handlers with a given IRQ capability.
	This group is just an enhanced version to l4irq_request() which takes a capability object instead of a plain number.

Functions
l4irq_t *	l4irq_request (int irqnum, void(*isr_handler)(void *), void *isr_data, int irq_thread_prio, unsigned mode)
	Attach asychronous ISR handler to IRQ.
long	l4irq_release (l4irq_t *irq)
	Release asynchronous ISR handler and free resources.

Detailed Description

This interface has just two (main) functions.

l4irq_request to install a handler for an interrupt and l4irq_release to uninstall the handler again and release all resources associated with it.

Function Documentation

l4irq_release()

long l4irq_release

(

l4irq_t *

irq

)

Release asynchronous ISR handler and free resources.

Parameters

irq	IRQ data structure

Returns

0 sucess, != 0 failure

Examples

examples/libs/libirq/async_isr.c.

References L4_CV.

l4irq_request()

l4irq_t * l4irq_request	(	int	irqnum,
		void(*	isr_handler )(void *),
		void *	isr_data,
		int	irq_thread_prio,
		unsigned	mode )

Attach asychronous ISR handler to IRQ.

Parameters

irqnum	IRQ number to request
isr_handler	Handler routine that is called when an interrupt triggers
isr_data	Pointer given as argument to isr_handler
irq_thread_prio	L4 thread priority of the ISR handler. Give -1 for same priority as creator.
mode	Interrupt type,

See also

L4_irq_mode

Returns

Pointer to l4irq_t structure, 0 on error

Examples

examples/libs/libirq/async_isr.c.

References L4_CV.