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/** event.c
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*
* Report bugs/suggestions to me ( mannol ) at either #tox-dev @ freenode.net:6667 or
* my email: eniz_vukovic@hotmail.com
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include "event.h"
#include "util.h"
#define _GNU_SOURCE
#include <assert.h>
#include <unistd.h>
#include <stddef.h>
#include <inttypes.h>
#include <pthread.h>
#define RUN_IN_THREAD(func, args) { pthread_t _tid; \
pthread_create(&_tid, NULL, func, args); assert( pthread_detach(_tid) == 0 ); }
#define LOCK(event_handler) pthread_mutex_lock (&event_handler->mutex)
#define UNLOCK(event_handler) pthread_mutex_unlock(&event_handler->mutex)
#define FREQUENCY 10000
#define inline__ inline __attribute__((always_inline))
typedef struct _EventContainer {
void* (*func)(void*);
void* func_args;
unsigned timeout;
long long id;
} EventContainer;
typedef struct _EventHandler {
EventContainer* timed_events;
size_t timed_events_count;
int running;
pthread_mutex_t mutex;
} EventHandler;
int throw_event( void* (func)(void*), void* arg );
int reset_timer_event ( int id, uint32_t timeout );
int throw_timer_event ( void* (func)(void*), void* arg, unsigned timeout);
int cancel_timer_event ( int id );
int execute_timer_event ( int id );
struct _Event event =
{
throw_event,
/* reset_timer_event */ NULL,
throw_timer_event,
cancel_timer_event,
/*execute_timer_event*/ NULL
};
/*
* Random functions used by this file
*/
void clear_events (EventContainer** event_container, size_t* counter)
{
free(*event_container );
*event_container = NULL;
*counter = 0;
}
int pop_id ( EventContainer** event_container, size_t* counter, int id )
{
if ( !*event_container || !*counter || !id )
return -1;
EventContainer* _it = *event_container;
int i;
for ( i = *counter; i; -- i ){
if ( _it->id == id ) { /* Hit! */
break;
}
++_it;
}
if ( i ) {
for ( ; i; -- i ){ *_it = *(_it + 1); ++_it; }
-- (*counter );
*event_container = realloc(*event_container, sizeof(EventContainer) * (*counter )); /* resize */
return 0;
}
/* not found here */
return -1;
}
void push_event ( EventContainer** container, size_t* counter, void* (func)(void*), void* arg )
{
(*container ) = realloc((*container ), sizeof(EventContainer) * ((*counter ) + 1));
assert((*container ) != NULL);
(*container )[*counter].func = func;
(*container )[*counter].func_args = arg;
(*container )[*counter].timeout = 0;
(*container )[*counter].id = 0;
(*counter )++;
}
void reorder_events ( size_t counter, EventContainer* container, unsigned timeout )
{
if ( counter > 1 ) {
int i = counter - 1;
/* start from behind excluding last added member */
EventContainer* _it = &container[i - 1];
EventContainer _last_added = container[i];
for ( ; i; --i ) {
if ( _it->timeout > timeout ){
*(_it + 1) = *_it;
*_it = _last_added; -- _it;
}
}
}
}
/* ============================================= */
/* main poll for event execution */
void* event_poll( void* arg )
{
EventHandler* _event_handler = arg;
while ( _event_handler->running )
{
LOCK( _event_handler );
if ( _event_handler->timed_events ){
uint32_t _time = ((uint32_t)(current_time() / 1000));
if ( _event_handler->timed_events[0].timeout < _time ) {
RUN_IN_THREAD ( _event_handler->timed_events[0].func,
_event_handler->timed_events[0].func_args );
pop_id(&_event_handler->timed_events,
&_event_handler->timed_events_count,
_event_handler->timed_events[0].id);
}
}
UNLOCK( _event_handler );
usleep(FREQUENCY);
}
LOCK( _event_handler );
clear_events(&_event_handler->timed_events, &_event_handler->timed_events_count);
UNLOCK( _event_handler );
_event_handler->running = -1;
pthread_exit(NULL);
}
int throw_event( void* (func)(void*), void* arg )
{
pthread_t _tid;
int _rc =
pthread_create(&_tid, NULL, func, arg );
return (0 != _rc ) ? _rc : pthread_detach(_tid);
}
EventHandler event_handler;
/* Place and order array of timers */
int throw_timer_event ( void* (func)(void*), void* arg, unsigned timeout)
{
static int _unique_id = 1;
push_event(&event_handler.timed_events, &(event_handler.timed_events_count), func, arg );
size_t _counter = event_handler.timed_events_count;
event_handler.timed_events[_counter - 1].timeout = timeout + ((uint32_t)(current_time() / 1000));
event_handler.timed_events[_counter - 1].id = _unique_id; ++_unique_id;
/* reorder */
reorder_events(_counter, event_handler.timed_events, timeout );
return _unique_id - 1;
}
int execute_timer_event ( int id )
{
int _status;
LOCK((&event_handler));
EventContainer* _it = event_handler.timed_events;
int _i = event_handler.timed_events_count;
/* Find it and execute */
for ( ; _i; _i-- ) {
if ( _it->id == id ) {
RUN_IN_THREAD ( _it->func, _it->func_args );
break;
}
++_it;
}
/* Now remove it from the queue */
if ( _i ) {
for ( ; _i; -- _i ){ *_it = *(_it + 1); ++_it; }
-- event_handler.timed_events_count;
event_handler.timed_events = realloc
(event_handler.timed_events, sizeof(EventContainer) * event_handler.timed_events_count); /* resize */
_status = 0;
}
else _status = -1;
UNLOCK((&event_handler));
return _status;
}
int reset_timer_event ( int id, uint32_t timeout )
{
int _status;
LOCK((&event_handler));
EventContainer* _it = event_handler.timed_events;
int _i = event_handler.timed_events_count;
/* Find it and change */
for ( ; _i; _i-- ) {
if ( _it->id == id ) {
_it->timeout = timeout + ((uint32_t)(current_time() / 1000));
break;
}
++_it;
}
_status = _i ? -1 : 0;
UNLOCK((&event_handler));
return _status;
}
/* Remove timer from array */
inline__ int cancel_timer_event ( int id )
{
return pop_id (&event_handler.timed_events, &event_handler.timed_events_count, id );
}
/* Initialization and termination of event polls
* This will be run at the beginning and the end of the program execution.
* I think that's the best way to do it.
*/
void __attribute__((constructor)) init_event_poll ()
{
event_handler.timed_events = NULL;
event_handler.timed_events_count = 0;
event_handler.running = 1;
pthread_mutex_init(&event_handler.mutex, NULL);
RUN_IN_THREAD(event_poll, &event_handler);
}
void __attribute__((destructor)) terminate_event_poll()
{
/* Exit thread */
event_handler.running = 0;
/* Keep the global until thread exits */
while (event_handler.running > -1) {
event_handler.running;
usleep(FREQUENCY*2);
}
pthread_mutex_destroy( &event_handler.mutex );
}
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