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qbloop.h(3) libqb qbloop.h(3)

NAME

qbloop.h -

Main loop manages timers, jobs and polling sockets.

SYNOPSIS

#include <signal.h>
#include <stdint.h>
#include <poll.h>

Typedefs


typedef struct qb_loop qb_loop_t
An opaque data type representing the main loop. typedef uint64_t qb_loop_timer_handle
typedef void * qb_loop_signal_handle
typedef int32_t(* qb_loop_poll_dispatch_fn )(int32_t fd, int32_t revents, void *data)
typedef void(* qb_loop_job_dispatch_fn )(void *data)
typedef void(* qb_loop_timer_dispatch_fn )(void *data)
typedef int32_t(* qb_loop_signal_dispatch_fn )(int32_t rsignal, void *data)
typedef void(* qb_loop_poll_low_fds_event_fn )(int32_t not_enough, int32_t fds_available)

Enumerations


enum qb_loop_priority { QB_LOOP_LOW = 0, QB_LOOP_MED = 1, QB_LOOP_HIGH = 2 }
Priorites for jobs, timers & poll.

Functions


qb_loop_t * qb_loop_create (void)
Create a new main loop. void qb_loop_destroy (struct qb_loop *l)
void qb_loop_stop (qb_loop_t *l)
Stop the main loop. void qb_loop_run (qb_loop_t *l)
Run the main loop. int32_t qb_loop_job_add (qb_loop_t *l, enum qb_loop_priority p, void *data, qb_loop_job_dispatch_fn dispatch_fn)
Add a job to the mainloop. int32_t qb_loop_job_del (struct qb_loop *l, enum qb_loop_priority p, void *data, qb_loop_job_dispatch_fn dispatch_fn)
Delete a job from the mainloop. int32_t qb_loop_timer_add (qb_loop_t *l, enum qb_loop_priority p, uint64_t nsec_duration, void *data, qb_loop_timer_dispatch_fn dispatch_fn, qb_loop_timer_handle *timer_handle_out)
Add a timer to the mainloop. int32_t qb_loop_timer_del (qb_loop_t *l, qb_loop_timer_handle th)
Delete a timer that is still outstanding. int32_t qb_loop_timer_is_running (qb_loop_t *l, qb_loop_timer_handle th)
Check to see if a timer that is still outstanding. uint64_t qb_loop_timer_expire_time_get (struct qb_loop *l, qb_loop_timer_handle th)
Get the time remaining before it expires. int32_t qb_loop_poll_low_fds_event_set (qb_loop_t *l, qb_loop_poll_low_fds_event_fn fn)
Set a callback to receive events on file descriptors getting low. int32_t qb_loop_poll_add (qb_loop_t *l, enum qb_loop_priority p, int32_t fd, int32_t events, void *data, qb_loop_poll_dispatch_fn dispatch_fn)
Add a poll job to the mainloop. int32_t qb_loop_poll_mod (qb_loop_t *l, enum qb_loop_priority p, int32_t fd, int32_t events, void *data, qb_loop_poll_dispatch_fn dispatch_fn)
Modify a poll job. int32_t qb_loop_poll_del (qb_loop_t *l, int32_t fd)
Delete a poll job. int32_t qb_loop_signal_add (qb_loop_t *l, enum qb_loop_priority p, int32_t sig, void *data, qb_loop_signal_dispatch_fn dispatch_fn, qb_loop_signal_handle *handle)
Add a signal job. int32_t qb_loop_signal_mod (qb_loop_t *l, enum qb_loop_priority p, int32_t sig, void *data, qb_loop_signal_dispatch_fn dispatch_fn, qb_loop_signal_handle handle)
Modify the signal job. int32_t qb_loop_signal_del (qb_loop_t *l, qb_loop_signal_handle handle)
Delete the signal job.

Detailed Description

Main loop manages timers, jobs and polling sockets.

Typedef Documentation

typedef void(* qb_loop_job_dispatch_fn)(void *data)

typedef int32_t(* qb_loop_poll_dispatch_fn)(int32_t fd, int32_t revents, void *data)

typedef void(* qb_loop_poll_low_fds_event_fn)(int32_t not_enough, int32_t fds_available)

typedef int32_t(* qb_loop_signal_dispatch_fn)(int32_t rsignal, void *data)

typedef void* qb_loop_signal_handle

typedef struct qb_loop qb_loop_t

An opaque data type representing the main loop.

typedef void(* qb_loop_timer_dispatch_fn)(void *data)

typedef uint64_t qb_loop_timer_handle

Enumeration Type Documentation

enum qb_loop_priority

Priorites for jobs, timers & poll.

Enumerator

Function Documentation

qb_loop_t* qb_loop_create (void)

Create a new main loop.

Returns:

loop instance.

void qb_loop_destroy (struct qb_loop *l)

int32_t qb_loop_job_add (qb_loop_t *l, enum qb_loop_priorityp, void *data, qb_loop_job_dispatch_fndispatch_fn)

Add a job to the mainloop. This is run in the next cycle of the loop.

Note:

it is a one-shot job.

Parameters:

l pointer to the loop instance
p the priority
data user data passed into the dispatch function
dispatch_fn callback function

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_job_del (struct qb_loop *l, enum qb_loop_priorityp, void *data, qb_loop_job_dispatch_fndispatch_fn)

Delete a job from the mainloop. This will try to delete the job if it hasn't run yet.

Note:

this will remove the first job that matches the paramaters (priority, data, dispatch_fn).

Parameters:

l pointer to the loop instance
p the priority
data user data passed into the dispatch function
dispatch_fn callback function

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_poll_add (qb_loop_t *l, enum qb_loop_priorityp, int32_tfd, int32_tevents, void *data, qb_loop_poll_dispatch_fndispatch_fn)

Add a poll job to the mainloop.

Note:

it is a re-occuring job.

Parameters:

l pointer to the loop instance
p the priority
fd file descriptor.
events (POLLIN|POLLOUT) etc ....
data user data passed into the dispatch function
dispatch_fn callback function

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_poll_del (qb_loop_t *l, int32_tfd)

Delete a poll job.

Parameters:

l pointer to the loop instance
fd file descriptor.

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_poll_low_fds_event_set (qb_loop_t *l, qb_loop_poll_low_fds_event_fnfn)

Set a callback to receive events on file descriptors getting low.

Parameters:

l pointer to the loop instance
fn callback function.

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_poll_mod (qb_loop_t *l, enum qb_loop_priorityp, int32_tfd, int32_tevents, void *data, qb_loop_poll_dispatch_fndispatch_fn)

Modify a poll job.

Parameters:

l pointer to the loop instance
p the priority
fd file descriptor.
events (POLLIN|POLLOUT) etc ....
data user data passed into the dispatch function
dispatch_fn callback function

Returns:

status (0 == ok, -errno == failure)

void qb_loop_run (qb_loop_t *l)

Run the main loop.

Parameters:

l pointer to the loop instance

int32_t qb_loop_signal_add (qb_loop_t *l, enum qb_loop_priorityp, int32_tsig, void *data, qb_loop_signal_dispatch_fndispatch_fn, qb_loop_signal_handle *handle)

Add a signal job. Get a callback on this signal (not in the context of the signal).

Parameters:

l pointer to the loop instance
p the priority
sig (SIGHUP or SIGINT) etc ....
data user data passed into the dispatch function
dispatch_fn callback function
handle (out) a reference to the signal job

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_signal_del (qb_loop_t *l, qb_loop_signal_handlehandle)

Delete the signal job.

Parameters:

l pointer to the loop instance
handle (in) a reference to the signal job

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_signal_mod (qb_loop_t *l, enum qb_loop_priorityp, int32_tsig, void *data, qb_loop_signal_dispatch_fndispatch_fn, qb_loop_signal_handlehandle)

Modify the signal job.

Parameters:

l pointer to the loop instance
p the priority
sig (SIGHUP or SIGINT) etc ....
data user data passed into the dispatch function
dispatch_fn callback function
handle (in) a reference to the signal job

Returns:

status (0 == ok, -errno == failure)

void qb_loop_stop (qb_loop_t *l)

Stop the main loop.

Parameters:

l pointer to the loop instance

int32_t qb_loop_timer_add (qb_loop_t *l, enum qb_loop_priorityp, uint64_tnsec_duration, void *data, qb_loop_timer_dispatch_fndispatch_fn, qb_loop_timer_handle *timer_handle_out)

Add a timer to the mainloop.

Note:

it is a one-shot job.

Parameters:

l pointer to the loop instance
p the priority
nsec_duration nano-secs in the future to run the dispatch.
data user data passed into the dispatch function
dispatch_fn callback function
timer_handle_out handle to delete the timer if needed.

Returns:

status (0 == ok, -errno == failure)

int32_t qb_loop_timer_del (qb_loop_t *l, qb_loop_timer_handleth)

Delete a timer that is still outstanding.

Parameters:

l pointer to the loop instance
th handle to delete the timer if needed.

Returns:

status (0 == ok, -errno == failure)

uint64_t qb_loop_timer_expire_time_get (struct qb_loop *l, qb_loop_timer_handleth)

Get the time remaining before it expires.

Note:

if the timer has already expired it will return 0

Parameters:

l pointer to the loop instance
th timer handle.

Returns:

nano seconds left

int32_t qb_loop_timer_is_running (qb_loop_t *l, qb_loop_timer_handleth)

Check to see if a timer that is still outstanding.

Parameters:

l pointer to the loop instance
th handle to delete the timer if needed.

Return values:

QB_TRUE yes this timer is outstanding
QB_FALSE this timer does not exist or has expired

Author

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Wed Apr 1 2020 Version 1.0.1