.TH "qbloop.h" 3 "Thu Dec 21 2017" "Version 1.0.3" "libqb" \" -*- nroff -*-
.ad l
.nh
.SH NAME
qbloop.h \- 
.PP
Main loop manages timers, jobs and polling sockets\&.  

.SH SYNOPSIS
.br
.PP
\fC#include <signal\&.h>\fP
.br
\fC#include <stdint\&.h>\fP
.br
\fC#include <poll\&.h>\fP
.br

.SS "Typedefs"

.in +1c
.ti -1c
.RI "typedef struct qb_loop \fBqb_loop_t\fP"
.br
.RI "\fIAn opaque data type representing the main loop\&. \fP"
.ti -1c
.RI "typedef uint64_t \fBqb_loop_timer_handle\fP"
.br
.ti -1c
.RI "typedef void * \fBqb_loop_signal_handle\fP"
.br
.ti -1c
.RI "typedef int32_t(* \fBqb_loop_poll_dispatch_fn\fP )(int32_t fd, int32_t revents, void *data)"
.br
.ti -1c
.RI "typedef void(* \fBqb_loop_job_dispatch_fn\fP )(void *data)"
.br
.ti -1c
.RI "typedef void(* \fBqb_loop_timer_dispatch_fn\fP )(void *data)"
.br
.ti -1c
.RI "typedef int32_t(* \fBqb_loop_signal_dispatch_fn\fP )(int32_t rsignal, void *data)"
.br
.ti -1c
.RI "typedef void(* \fBqb_loop_poll_low_fds_event_fn\fP )(int32_t not_enough, int32_t fds_available)"
.br
.in -1c
.SS "Enumerations"

.in +1c
.ti -1c
.RI "enum \fBqb_loop_priority\fP { \fBQB_LOOP_LOW\fP = 0, \fBQB_LOOP_MED\fP = 1, \fBQB_LOOP_HIGH\fP = 2 }"
.br
.RI "\fIPriorites for jobs, timers & poll\&. \fP"
.in -1c
.SS "Functions"

.in +1c
.ti -1c
.RI "\fBqb_loop_t\fP * \fBqb_loop_create\fP (void)"
.br
.RI "\fICreate a new main loop\&. \fP"
.ti -1c
.RI "void \fBqb_loop_destroy\fP (struct qb_loop *l)"
.br
.ti -1c
.RI "void \fBqb_loop_stop\fP (\fBqb_loop_t\fP *l)"
.br
.RI "\fIStop the main loop\&. \fP"
.ti -1c
.RI "void \fBqb_loop_run\fP (\fBqb_loop_t\fP *l)"
.br
.RI "\fIRun the main loop\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_job_add\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, void *data, \fBqb_loop_job_dispatch_fn\fP dispatch_fn)"
.br
.RI "\fIAdd a job to the mainloop\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_job_del\fP (struct qb_loop *l, enum \fBqb_loop_priority\fP p, void *data, \fBqb_loop_job_dispatch_fn\fP dispatch_fn)"
.br
.RI "\fIDelete a job from the mainloop\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_timer_add\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, uint64_t nsec_duration, void *data, \fBqb_loop_timer_dispatch_fn\fP dispatch_fn, \fBqb_loop_timer_handle\fP *timer_handle_out)"
.br
.RI "\fIAdd a timer to the mainloop\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_timer_del\fP (\fBqb_loop_t\fP *l, \fBqb_loop_timer_handle\fP th)"
.br
.RI "\fIDelete a timer that is still outstanding\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_timer_is_running\fP (\fBqb_loop_t\fP *l, \fBqb_loop_timer_handle\fP th)"
.br
.RI "\fICheck to see if a timer that is still outstanding\&. \fP"
.ti -1c
.RI "uint64_t \fBqb_loop_timer_expire_time_get\fP (struct qb_loop *l, \fBqb_loop_timer_handle\fP th)"
.br
.RI "\fIGet the time remaining before it expires\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_poll_low_fds_event_set\fP (\fBqb_loop_t\fP *l, \fBqb_loop_poll_low_fds_event_fn\fP fn)"
.br
.RI "\fISet a callback to receive events on file descriptors getting low\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_poll_add\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, int32_t fd, int32_t events, void *data, \fBqb_loop_poll_dispatch_fn\fP dispatch_fn)"
.br
.RI "\fIAdd a poll job to the mainloop\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_poll_mod\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, int32_t fd, int32_t events, void *data, \fBqb_loop_poll_dispatch_fn\fP dispatch_fn)"
.br
.RI "\fIModify a poll job\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_poll_del\fP (\fBqb_loop_t\fP *l, int32_t fd)"
.br
.RI "\fIDelete a poll job\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_signal_add\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, int32_t sig, void *data, \fBqb_loop_signal_dispatch_fn\fP dispatch_fn, \fBqb_loop_signal_handle\fP *handle)"
.br
.RI "\fIAdd a signal job\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_signal_mod\fP (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fP p, int32_t sig, void *data, \fBqb_loop_signal_dispatch_fn\fP dispatch_fn, \fBqb_loop_signal_handle\fP handle)"
.br
.RI "\fIModify the signal job\&. \fP"
.ti -1c
.RI "int32_t \fBqb_loop_signal_del\fP (\fBqb_loop_t\fP *l, \fBqb_loop_signal_handle\fP handle)"
.br
.RI "\fIDelete the signal job\&. \fP"
.in -1c
.SH "Detailed Description"
.PP 
Main loop manages timers, jobs and polling sockets\&. 


.SH "Typedef Documentation"
.PP 
.SS "typedef void(* qb_loop_job_dispatch_fn)(void *data)"

.SS "typedef int32_t(* qb_loop_poll_dispatch_fn)(int32_t fd, int32_t revents, void *data)"

.SS "typedef void(* qb_loop_poll_low_fds_event_fn)(int32_t not_enough, int32_t fds_available)"

.SS "typedef int32_t(* qb_loop_signal_dispatch_fn)(int32_t rsignal, void *data)"

.SS "typedef void* \fBqb_loop_signal_handle\fP"

.SS "typedef struct qb_loop \fBqb_loop_t\fP"

.PP
An opaque data type representing the main loop\&. 
.SS "typedef void(* qb_loop_timer_dispatch_fn)(void *data)"

.SS "typedef uint64_t \fBqb_loop_timer_handle\fP"

.SH "Enumeration Type Documentation"
.PP 
.SS "enum \fBqb_loop_priority\fP"

.PP
Priorites for jobs, timers & poll\&. 
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIQB_LOOP_LOW \fP\fP
.TP
\fB\fIQB_LOOP_MED \fP\fP
.TP
\fB\fIQB_LOOP_HIGH \fP\fP
.SH "Function Documentation"
.PP 
.SS "\fBqb_loop_t\fP* qb_loop_create (void)"

.PP
Create a new main loop\&. 
.PP
\fBReturns:\fP
.RS 4
loop instance\&. 
.RE
.PP

.SS "void qb_loop_destroy (struct qb_loop *l)"

.SS "int32_t qb_loop_job_add (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, void *data, \fBqb_loop_job_dispatch_fn\fPdispatch_fn)"

.PP
Add a job to the mainloop\&. This is run in the next cycle of the loop\&. 
.PP
\fBNote:\fP
.RS 4
it is a one-shot job\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_job_del (struct qb_loop *l, enum \fBqb_loop_priority\fPp, void *data, \fBqb_loop_job_dispatch_fn\fPdispatch_fn)"

.PP
Delete a job from the mainloop\&. This will try to delete the job if it hasn't run yet\&.
.PP
\fBNote:\fP
.RS 4
this will remove the first job that matches the parameters (priority, data, dispatch_fn)\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_poll_add (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, int32_tfd, int32_tevents, void *data, \fBqb_loop_poll_dispatch_fn\fPdispatch_fn)"

.PP
Add a poll job to the mainloop\&. 
.PP
\fBNote:\fP
.RS 4
it is a re-occurring job\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIfd\fP file descriptor\&. 
.br
\fIevents\fP (POLLIN|POLLOUT) etc \&.\&.\&.\&. 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_poll_del (\fBqb_loop_t\fP *l, int32_tfd)"

.PP
Delete a poll job\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIfd\fP file descriptor\&. 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_poll_low_fds_event_set (\fBqb_loop_t\fP *l, \fBqb_loop_poll_low_fds_event_fn\fPfn)"

.PP
Set a callback to receive events on file descriptors getting low\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIfn\fP callback function\&. 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_poll_mod (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, int32_tfd, int32_tevents, void *data, \fBqb_loop_poll_dispatch_fn\fPdispatch_fn)"

.PP
Modify a poll job\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIfd\fP file descriptor\&. 
.br
\fIevents\fP (POLLIN|POLLOUT) etc \&.\&.\&.\&. 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "void qb_loop_run (\fBqb_loop_t\fP *l)"

.PP
Run the main loop\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.RE
.PP

.SS "int32_t qb_loop_signal_add (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, int32_tsig, void *data, \fBqb_loop_signal_dispatch_fn\fPdispatch_fn, \fBqb_loop_signal_handle\fP *handle)"

.PP
Add a signal job\&. Get a callback on this signal (not in the context of the signal)\&.
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIsig\fP (SIGHUP or SIGINT) etc \&.\&.\&.\&. 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.br
\fIhandle\fP (out) a reference to the signal job 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_signal_del (\fBqb_loop_t\fP *l, \fBqb_loop_signal_handle\fPhandle)"

.PP
Delete the signal job\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIhandle\fP (in) a reference to the signal job 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_signal_mod (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, int32_tsig, void *data, \fBqb_loop_signal_dispatch_fn\fPdispatch_fn, \fBqb_loop_signal_handle\fPhandle)"

.PP
Modify the signal job\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fIsig\fP (SIGHUP or SIGINT) etc \&.\&.\&.\&. 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.br
\fIhandle\fP (in) a reference to the signal job 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "void qb_loop_stop (\fBqb_loop_t\fP *l)"

.PP
Stop the main loop\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.RE
.PP

.SS "int32_t qb_loop_timer_add (\fBqb_loop_t\fP *l, enum \fBqb_loop_priority\fPp, uint64_tnsec_duration, void *data, \fBqb_loop_timer_dispatch_fn\fPdispatch_fn, \fBqb_loop_timer_handle\fP *timer_handle_out)"

.PP
Add a timer to the mainloop\&. 
.PP
\fBNote:\fP
.RS 4
it is a one-shot job\&.
.RE
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIp\fP the priority 
.br
\fInsec_duration\fP nano-secs in the future to run the dispatch\&. 
.br
\fIdata\fP user data passed into the dispatch function 
.br
\fIdispatch_fn\fP callback function 
.br
\fItimer_handle_out\fP handle to delete the timer if needed\&. 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "int32_t qb_loop_timer_del (\fBqb_loop_t\fP *l, \fBqb_loop_timer_handle\fPth)"

.PP
Delete a timer that is still outstanding\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIth\fP handle to delete the timer if needed\&. 
.RE
.PP
\fBReturns:\fP
.RS 4
status (0 == ok, -errno == failure) 
.RE
.PP

.SS "uint64_t qb_loop_timer_expire_time_get (struct qb_loop *l, \fBqb_loop_timer_handle\fPth)"

.PP
Get the time remaining before it expires\&. 
.PP
\fBNote:\fP
.RS 4
if the timer has already expired it will return 0
.RE
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIth\fP timer handle\&. 
.RE
.PP
\fBReturns:\fP
.RS 4
nano seconds left 
.RE
.PP

.SS "int32_t qb_loop_timer_is_running (\fBqb_loop_t\fP *l, \fBqb_loop_timer_handle\fPth)"

.PP
Check to see if a timer that is still outstanding\&. 
.PP
\fBParameters:\fP
.RS 4
\fIl\fP pointer to the loop instance 
.br
\fIth\fP handle to delete the timer if needed\&. 
.RE
.PP
\fBReturn values:\fP
.RS 4
\fIQB_TRUE\fP yes this timer is outstanding 
.br
\fIQB_FALSE\fP this timer does not exist or has expired 
.RE
.PP

.SH "Author"
.PP 
Generated automatically by Doxygen for libqb from the source code\&.