mirror of
https://git.haproxy.org/git/haproxy.git/
synced 2025-08-16 03:56:56 +02:00
8280ea97a0
A long time ago, applets were seen as an alternative to connections, and since their respective sizes were roughly equal it appeared wise to share the same pool. Nowadays, connections got significantly larger but applets are not that often used, except for the cache. However applets are mostly complementary and not alternatives anymore, as it's very possible not to have a back connection or to share one with other streams. The connections will soon lose their addresses and their size will shrink so much that appctx won't fit anymore. Given that the old benefits of sharing these pools have long disappeared, let's stop doing this and have a dedicated pool for appctx.
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
|
|
* 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>
|
|
#include <proto/task.h>
|
|
|
|
unsigned int nb_applets = 0;
|
|
|
|
DECLARE_POOL(pool_head_appctx, "appctx", sizeof(struct appctx));
|
|
|
|
/* Callback used to wake up an applet when a buffer is available. The applet
|
|
* <appctx> is woken up if an input buffer was requested for the associated
|
|
* stream interface. In this case the buffer is immediately allocated and the
|
|
* function returns 1. Otherwise it returns 0. Note that this automatically
|
|
* covers multiple wake-up attempts by ensuring that the same buffer will not
|
|
* be accounted for multiple times.
|
|
*/
|
|
int appctx_buf_available(void *arg)
|
|
{
|
|
struct appctx *appctx = arg;
|
|
struct stream_interface *si = appctx->owner;
|
|
|
|
/* allocation requested ? */
|
|
if (!(si->flags & SI_FL_RXBLK_BUFF))
|
|
return 0;
|
|
|
|
si_rx_buff_rdy(si);
|
|
|
|
/* was already allocated another way ? if so, don't take this one */
|
|
if (c_size(si_ic(si)) || si_ic(si)->pipe)
|
|
return 0;
|
|
|
|
/* allocation possible now ? */
|
|
if (!b_alloc_margin(&si_ic(si)->buf, global.tune.reserved_bufs)) {
|
|
si_rx_buff_blk(si);
|
|
return 0;
|
|
}
|
|
|
|
task_wakeup(appctx->t, TASK_WOKEN_RES);
|
|
return 1;
|
|
}
|
|
|
|
/* Default applet handler */
|
|
struct task *task_run_applet(struct task *t, void *context, unsigned short state)
|
|
{
|
|
struct appctx *app = context;
|
|
struct stream_interface *si = app->owner;
|
|
unsigned int rate;
|
|
|
|
if (app->state & APPLET_WANT_DIE) {
|
|
__appctx_free(app);
|
|
return NULL;
|
|
}
|
|
|
|
/* 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_cant_get(si);
|
|
si_rx_endp_done(si);
|
|
|
|
/* measure the call rate */
|
|
rate = update_freq_ctr(&app->call_rate, 1);
|
|
if (rate >= 100000 && app->call_rate.prev_ctr) { // make sure to wait at least a full second
|
|
stream_dump_and_crash(&app->obj_type, read_freq_ctr(&app->call_rate));
|
|
}
|
|
|
|
/* Now we'll try to allocate the input buffer. We wake up the applet in
|
|
* all cases. So this is the applet's responsibility to check if this
|
|
* buffer was allocated or not. This leaves a chance for applets to do
|
|
* some other processing if needed. The applet doesn't have anything to
|
|
* do if it needs the buffer, it will be called again upon readiness.
|
|
*/
|
|
if (!si_alloc_ibuf(si, &app->buffer_wait))
|
|
si_rx_endp_more(si);
|
|
|
|
app->applet->fct(app);
|
|
si_applet_wake_cb(si);
|
|
channel_release_buffer(si_ic(si), &app->buffer_wait);
|
|
return t;
|
|
}
|
|
|