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/*
* 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
* dequeuing 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->queue.length || (p->queue.length && 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;
}
/* initialize the queue <queue> for proxy <px> and server <sv>. A server's
* always has both a valid proxy and a valid server. A proxy's queue only
* has a valid proxy and NULL for the server queue. This is how they're
* distinguished during operations.
*/
static inline void queue_init(struct queue *queue, struct proxy *px, struct server *sv)
{
queue->head = EB_ROOT;
queue->length = 0;
queue->idx = 0;
queue->px = px;
queue->sv = sv;
HA_SPIN_INIT(&queue->lock);
}
#endif /* _HAPROXY_QUEUE_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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