blob: 0e550c262cd37c893d691d3a187e0da6fddd1d56 [file] [log] [blame]
/*
* Functions managing applets
*
* Copyright 2000-2015 Willy Tarreau <w@1wt.eu>
*
* This program 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
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <common/config.h>
#include <common/mini-clist.h>
#include <proto/applet.h>
#include <proto/channel.h>
#include <proto/stream.h>
#include <proto/stream_interface.h>
unsigned int nb_applets = 0;
unsigned int applets_active_queue = 0;
#ifdef USE_THREAD
HA_SPINLOCK_T applet_active_lock; /* spin lock related to applet active queue */
#endif
struct list applet_active_queue = LIST_HEAD_INIT(applet_active_queue);
void applet_run_active()
{
struct appctx *curr, *next;
struct stream_interface *si;
struct list applet_cur_queue = LIST_HEAD_INIT(applet_cur_queue);
if (!applets_active_queue)
return;
HA_SPIN_LOCK(APPLETS_LOCK, &applet_active_lock);
curr = LIST_NEXT(&applet_active_queue, typeof(curr), runq);
while (&curr->runq != &applet_active_queue) {
next = LIST_NEXT(&curr->runq, typeof(next), runq);
if (curr->thread_mask & tid_bit) {
LIST_DEL(&curr->runq);
curr->state = APPLET_RUNNING;
LIST_ADDQ(&applet_cur_queue, &curr->runq);
applets_active_queue--;
}
curr = next;
}
HA_SPIN_UNLOCK(APPLETS_LOCK, &applet_active_lock);
/* The list is only scanned from the head. This guarantees that if any
* applet removes another one, there is no side effect while walking
* through the list.
*/
while (!LIST_ISEMPTY(&applet_cur_queue)) {
curr = LIST_ELEM(applet_cur_queue.n, typeof(curr), runq);
si = curr->owner;
/* Now we'll try to allocate the input buffer. We wake up the
* applet in all cases. So this is the applet responsibility to
* check if this buffer was allocated or not. This let a chance
* for applets to do some other processing if needed. */
if (!channel_alloc_buffer(si_ic(si), &curr->buffer_wait))
si_applet_cant_put(si);
/* We always pretend the applet can't get and doesn't want to
* put, it's up to it to change this if needed. This ensures
* that one applet which ignores any event will not spin.
*/
si_applet_cant_get(si);
si_applet_stop_put(si);
curr->applet->fct(curr);
si_applet_wake_cb(si);
channel_release_buffer(si_ic(si), &curr->buffer_wait);
if (applet_cur_queue.n == &curr->runq) {
/* curr was left in the list, move it back to the active list */
LIST_DEL(&curr->runq);
LIST_INIT(&curr->runq);
HA_SPIN_LOCK(APPLETS_LOCK, &applet_active_lock);
if (curr->state & APPLET_WANT_DIE) {
curr->state = APPLET_SLEEPING;
__appctx_free(curr);
}
else {
if (curr->state & APPLET_WOKEN_UP) {
curr->state = APPLET_SLEEPING;
__appctx_wakeup(curr);
}
else {
curr->state = APPLET_SLEEPING;
}
}
HA_SPIN_UNLOCK(APPLETS_LOCK, &applet_active_lock);
}
}
}
__attribute__((constructor))
static void __applet_init(void)
{
HA_SPIN_INIT(&applet_active_lock);
}