You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
3.9 KiB
120 lines
3.9 KiB
/*
|
|
* include/haproxy/queue.h
|
|
* This file defines everything related to queues.
|
|
*
|
|
* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation, version 2.1
|
|
* exclusively.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef _HAPROXY_QUEUE_H
|
|
#define _HAPROXY_QUEUE_H
|
|
|
|
#include <haproxy/api.h>
|
|
#include <haproxy/backend.h>
|
|
#include <haproxy/pool.h>
|
|
#include <haproxy/proxy-t.h>
|
|
#include <haproxy/queue-t.h>
|
|
#include <haproxy/server-t.h>
|
|
#include <haproxy/stream-t.h>
|
|
|
|
extern struct pool_head *pool_head_pendconn;
|
|
|
|
struct pendconn *pendconn_add(struct stream *strm);
|
|
int pendconn_dequeue(struct stream *strm);
|
|
void process_srv_queue(struct server *s);
|
|
unsigned int srv_dynamic_maxconn(const struct server *s);
|
|
int pendconn_redistribute(struct server *s);
|
|
int pendconn_grab_from_px(struct server *s);
|
|
void pendconn_unlink(struct pendconn *p);
|
|
|
|
/* Removes the pendconn from the server/proxy queue. It supports being called
|
|
* with NULL for pendconn and with a pendconn not in the list. It is the
|
|
* function to be used by default when unsure. Do not call it with server
|
|
* or proxy locks held however. Warning: this is called from stream_free()
|
|
* which may run concurrently with pendconn_process_next_strm() which can be
|
|
* dequeing the entry. The function must not return until the pendconn is
|
|
* guaranteed not to be known, which means that we must check its presence
|
|
* in the tree under the queue's lock so that penconn_process_next_strm()
|
|
* finishes before we return in case it would have grabbed this pendconn. See
|
|
* github bugs #880 and #908, and the commit log for this fix for more details.
|
|
*/
|
|
static inline void pendconn_cond_unlink(struct pendconn *p)
|
|
{
|
|
if (p)
|
|
pendconn_unlink(p);
|
|
}
|
|
|
|
/* Releases the pendconn associated to stream <s> if it has any, and decreases
|
|
* the pending count if needed. The connection might have been queued to a
|
|
* specific server as well as to the proxy. The stream also gets marked
|
|
* unqueued.
|
|
*
|
|
* This function must be called by the stream itself, so in the context of
|
|
* process_stream, without any lock held among the pendconn, the server's queue
|
|
* nor the proxy's queue.
|
|
*/
|
|
static inline void pendconn_free(struct stream *s)
|
|
{
|
|
struct pendconn *p = s->pend_pos;
|
|
|
|
if (p) {
|
|
pendconn_cond_unlink(p);
|
|
s->pend_pos = NULL;
|
|
pool_free(pool_head_pendconn, p);
|
|
}
|
|
}
|
|
|
|
/* Returns 0 if all slots are full on a server, or 1 if there are slots available. */
|
|
static inline int server_has_room(const struct server *s) {
|
|
return !s->maxconn || s->cur_sess < srv_dynamic_maxconn(s);
|
|
}
|
|
|
|
/* returns 0 if nothing has to be done for server <s> regarding queued connections,
|
|
* and non-zero otherwise. If the server is down, we only check its own queue. Suited
|
|
* for and if/else usage.
|
|
*/
|
|
static inline int may_dequeue_tasks(const struct server *s, const struct proxy *p) {
|
|
return (s && (s->nbpend || (p->nbpend && srv_currently_usable(s))) &&
|
|
(!s->maxconn || s->cur_sess < srv_dynamic_maxconn(s)));
|
|
}
|
|
|
|
static inline int queue_limit_class(int class)
|
|
{
|
|
if (class < -0x7ff)
|
|
return -0x7ff;
|
|
if (class > 0x7ff)
|
|
return 0x7ff;
|
|
return class;
|
|
}
|
|
|
|
static inline int queue_limit_offset(int offset)
|
|
{
|
|
if (offset < -0x7ffff)
|
|
return -0x7ffff;
|
|
if (offset > 0x7ffff)
|
|
return 0x7ffff;
|
|
return offset;
|
|
}
|
|
|
|
|
|
#endif /* _HAPROXY_QUEUE_H */
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-indent-level: 8
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|
|
|