gp_timer.h File Reference

Timers and timer queue implementation. More...

#include <stdint.h>
#include <utils/gp_types.h>
#include <input/gp_types.h>

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Data Structures
struct	gp_timer
	A timer. More...

Macros
#define	GP_TIMER_STOP   UINT32_MAX
	Return this value from the callback to stop a timer.

Functions
static int	gp_timer_running (gp_timer *timer)
	Returns if timer is running.
void	gp_timer_queue_dump (gp_timer *queue)
	Prints the structrue of binary heap into stdout, only for debugging.
void	gp_timer_queue_ins (gp_timer **queue, uint64_t now, gp_timer *timer)
	Inserts timer into the timer priority queue.
void	gp_timer_queue_rem (gp_timer **queue, gp_timer *timer)
	Removes timer from timer queue.
int	gp_timer_queue_process (gp_timer **queue, uint64_t now)
	Processes queue, all timers with expires <= now are processed.
static unsigned int	gp_timer_queue_size (gp_timer *queue)
	Returns size of the queue, i.e. number of timers.

Detailed Description

Timers and timer queue implementation.

Definition in file gp_timer.h.

Function Documentation

gp_timer_queue_dump()

void gp_timer_queue_dump

(

gp_timer *

queue

)

Prints the structrue of binary heap into stdout, only for debugging.

Parameters

queue

A timer queue.

gp_timer_queue_ins()

void gp_timer_queue_ins	(	gp_timer **	queue,
		uint64_t	now,
		gp_timer *	timer
	)

Inserts timer into the timer priority queue.

If timer is already running nothing is done. In order to reschedulle a timer it has to be removed from the queue first.

It's safe to call insert from the timer callback.

If timer was removed then inserted from the timer callback the timer is reschedulled at now + timer->expired time and the return value from the callback is discarded.

Parameters

queue	A timer queue.
now	A timestamp, usually obtained by calling gp_time_stamp().
timer	A timer to insert.

gp_timer_queue_process()

int gp_timer_queue_process	(	gp_timer **	queue,
		uint64_t	now
	)

Processes queue, all timers with expires <= now are processed.

It's possible to reschedulle a timer with expires set to 0, which will process the timer on the next process call.

Parameters

queue	A timer queue.
now	A timestamp, usually obtained by calling gp_time_stamp().

Returns

Number of timers processed.

gp_timer_queue_rem()

void gp_timer_queue_rem	(	gp_timer **	queue,
		gp_timer *	timer
	)

Removes timer from timer queue.

It's safe to call remove from the timer callback.

If called from the timer callback the timer is stopped and the return value from the callback is discarded.

Parameters

queue	A timer queue.
timer	A timer to insert.

gp_timer_queue_size()

static unsigned int gp_timer_queue_size ( gp_timer *  queue )

inlinestatic

Returns size of the queue, i.e. number of timers.

Parameters

queue

A timer queue.

Returns

A Number of timers in the queue.

Definition at line 139 of file gp_timer.h.

Referenced by gp_backend_timers_queued().

gp_timer_running()

static int gp_timer_running ( gp_timer *  timer )

inlinestatic

Returns if timer is running.

A timer is running if it's inserted into a timer queue.

Parameters

timer

A timer.

Returns

Non-zero if timer is running, zero otherwise.

Definition at line 78 of file gp_timer.h.

References gp_timer::running.