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selloop.c
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selloop.c
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/*
* loop.c - the select main loop for servers functions
*
* include LICENSE
*/
#define _GNU_SOURCE /* sys/time.h */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <selloop.h>
#include <timer.h>
#include <msglog.h>
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
/*
* local prototypes
*/
int loop_iter_channel_func( AppClass *channel, void *user_data );
/*
*** \brief Allocates memory for a new Loop object.
*/
Loop *loop_new( int max_cnx, void *user_data )
{
Loop *loop;
loop = app_new0(Loop, 1);
loop_construct( loop, max_cnx, user_data);
app_class_overload_destroy( (AppClass *) loop, loop_destroy );
return loop;
}
/** \brief Constructor for the Loop object. */
void loop_construct( Loop *loop, int max_cnx, void *user_data )
{
app_class_construct( (AppClass *) loop );
loop->max_width = max_cnx;
loop->user_data = user_data;
/* default values */
loop->loop_timeout.tv_sec = 0;
loop->loop_timeout.tv_usec = 250000;
loop->timer_interval.tv_sec = 0;
loop->timer_interval.tv_usec = 500000;
}
/** \brief Destructor for the Loop object. */
void loop_destroy(void *loop)
{
Loop *this = (Loop *) loop;
if (loop == NULL) {
return;
}
if ( this->channels ){
dlist_delete_all( this->channels );
}
if ( this->timers ){
dlist_delete_all( this->timers );
}
app_class_destroy( loop );
}
void loop_set_loop_timeout(Loop *loop, int ms )
{
loop->loop_timeout.tv_sec = ms / 1000;
loop->loop_timeout.tv_usec = (ms % 1000) * 1000;
}
void loop_set_timer_interval(Loop *loop, int ms )
{
loop->timer_interval.tv_sec = ms / 1000;
loop->timer_interval.tv_usec = (ms % 1000) * 1000;
}
void loop_set_fds(Loop *loop, int s )
{
loop->width = MAX(loop->width, s + 1);
if ( loop->width >= loop->max_width ){
msg_error( "number of fds exhausted %d >= %d", loop->width,
loop->max_width ) ;
}
FD_SET( s, &loop->fdsmsk ) ;
}
void loop_clr_fds(Loop *loop, int s )
{
FD_CLR( s, &loop->fdsmsk ) ;
}
void loop_channel_add(Loop *loop, Channel *cha )
{
loop->channels = dlist_add_tail ( loop->channels, (AppClass *) cha );
loop_set_fds(loop, cha->fd );
}
/*
* remove the desc only
* the list will be updated in dlist_iterator with appropriate ret code
*/
void loop_channel_remove_fd(Loop *loop, Channel *cha )
{
if ( ! cha || cha->fd < 0 ) {
return;
}
FD_CLR( cha->fd, &loop->fdsmsk ) ;
cha->fd = -1; /* mark fd as removed */
}
void loop_channel_remove(Loop *loop, Channel *cha )
{
if ( ! cha ) {
return;
}
loop_channel_remove_fd(loop, cha );
loop->channels = dlist_delete ( loop->channels, (AppClass *) cha, dlist_iterator_cmp );
}
void loop_timer_add(Loop *loop, Timer *timer )
{
loop->timers = dlist_add_tail ( loop->timers, (AppClass *) timer );
}
void loop_timer_remove(Loop *loop, Timer *timer )
{
loop->timers = dlist_delete ( loop->timers, (AppClass *) timer, dlist_iterator_cmp );
}
int loop_iter_channel_func( AppClass *channel, void *user_data )
{
Channel *cha = (Channel *) channel ;
Loop *loop = (Loop *) user_data ;
int ret = 0;
if ( FD_ISSET( cha->fd, &loop->fdscopy) ){
/* client ready for write to , loop ready for read from */
ret = cha->rdfunc( cha, user_data) ;
}
return ret; /* return 0 to avoid deleting the channel node */
}
void loop_quit(Loop *loop )
{
loop->endRequest = 1;
}
void loop_run(Loop *loop )
{
int do_timers = 0;
int j;
int ret = 0;
struct timeval sel_timeout ;
struct timeval run_timers ;
struct timeval time_now ;
timerclear(&run_timers);
for ( ; ! loop->endRequest ; ) {
msg_infol( 6, "Main loop - %d active connections\n", ret) ;
loop->fdscopy = loop->fdsmsk;
sel_timeout.tv_sec = loop->loop_timeout.tv_sec;
sel_timeout.tv_usec = loop->loop_timeout.tv_usec ;
j = select(loop->width, &loop->fdscopy, NULL, NULL, &sel_timeout );
if ( j <= 0 ){
if ( j < 0 ) {
msg_error( "select readfds - err %s", strerror(errno)) ;
continue ;
}
/* j == 0 , timeout */
gettimeofday(&time_now, NULL );
if ( timercmp(&time_now, &run_timers, >= ) ){
do_timers = 1;
}
}
if ( do_timers ){
do_timers = 0;
// fprintf(stderr, "doing timers\n");
dlist_iterator( loop->timers, timer_iter_timer_func, loop );
timeradd(&time_now, &loop->timer_interval, &run_timers);
}
if ( j == 0 ) {
continue ;
}
dlist_iterator( loop->channels, loop_iter_channel_func, loop );
}
}