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/*
Unix SMB/Netbios implementation.
Prefork Helpers
Copyright (C) Simo Sorce <idra@samba.org> 2011
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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/server_prefork.h"
#include "lib/server_prefork_util.h"
void pfh_daemon_config(const char *daemon_name,
struct pf_daemon_config *cfg,
struct pf_daemon_config *default_cfg)
{
int min, max, rate, allow, life;
min = lp_parm_int(GLOBAL_SECTION_SNUM,
daemon_name,
"prefork_min_children",
default_cfg->min_children);
max = lp_parm_int(GLOBAL_SECTION_SNUM,
daemon_name,
"prefork_max_children",
default_cfg->max_children);
rate = lp_parm_int(GLOBAL_SECTION_SNUM,
daemon_name,
"prefork_spawn_rate",
default_cfg->spawn_rate);
allow = lp_parm_int(GLOBAL_SECTION_SNUM,
daemon_name,
"prefork_max_allowed_clients",
default_cfg->max_allowed_clients);
life = lp_parm_int(GLOBAL_SECTION_SNUM,
daemon_name,
"prefork_child_min_life",
default_cfg->child_min_life);
if (max > cfg->max_children && cfg->max_children != 0) {
cfg->prefork_status |= PFH_NEW_MAX;
}
cfg->min_children = min;
cfg->max_children = max;
cfg->spawn_rate = rate;
cfg->max_allowed_clients = allow;
cfg->child_min_life = life;
}
void pfh_manage_pool(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct pf_daemon_config *cfg,
struct prefork_pool *pool)
{
time_t now = time(NULL);
int total, avail;
int ret, n;
bool msg = false;
if ((cfg->prefork_status & PFH_NEW_MAX) &&
!(cfg->prefork_status & PFH_ENOSPC)) {
ret = prefork_expand_pool(pool, cfg->max_children);
if (ret == ENOSPC) {
cfg->prefork_status |= PFH_ENOSPC;
}
cfg->prefork_status &= ~PFH_NEW_MAX;
}
total = prefork_count_children(pool, NULL);
avail = prefork_count_allowed_connections(pool);
DEBUG(10, ("(Pre)Stats: children: %d, allowed connections: %d\n",
total, avail));
if ((total < cfg->max_children) && (avail < cfg->spawn_rate)) {
n = prefork_add_children(ev_ctx, msg_ctx,
pool, cfg->spawn_rate);
if (n < cfg->spawn_rate) {
DEBUG(10, ("Attempted to add %d children but only "
"%d were actually added!\n",
cfg->spawn_rate, n));
}
} else if ((avail - cfg->min_children) >= cfg->spawn_rate) {
/* be a little slower in retiring children, to allow for
* double spikes of traffic to be handled more gracefully */
n = (cfg->spawn_rate / 2) + 1;
if (n > cfg->spawn_rate) {
n = cfg->spawn_rate;
}
if ((total - n) < cfg->min_children) {
n = total - cfg->min_children;
}
if (n >= 0) {
prefork_retire_children(msg_ctx, pool, n,
now - cfg->child_min_life);
}
}
/* total/avail may have just been changed in the above if/else */
total = prefork_count_children(pool, NULL);
avail = prefork_count_allowed_connections(pool);
if ((total == cfg->max_children) && (avail < cfg->spawn_rate)) {
n = avail;
while (avail < cfg->spawn_rate) {
prefork_increase_allowed_clients(pool,
cfg->max_allowed_clients);
avail = prefork_count_allowed_connections(pool);
/* if avail didn't change do not loop forever */
if (n == avail) break;
n = avail;
}
msg = true;
} else if (avail > total + cfg->spawn_rate) {
n = avail;
while (avail > total + cfg->spawn_rate) {
prefork_decrease_allowed_clients(pool);
avail = prefork_count_allowed_connections(pool);
/* if avail didn't change do not loop forever */
if (n == avail) break;
n = avail;
}
}
/* send message to all children when we change maximum allowed
* connections, so that they can decide to start again to listen to
* sockets if they were already topping the number of allowed
* clients. Useful only when we increase allowed clients */
if (msg) {
prefork_warn_active_children(msg_ctx, pool);
}
DEBUG(10, ("Stats: children: %d, allowed connections: %d\n",
prefork_count_children(pool, NULL),
prefork_count_allowed_connections(pool)));
}
void pfh_client_terminated(struct pf_worker_data *pf)
{
if (pf->num_clients >= 0) {
pf->num_clients--;
} else {
if (pf->status != PF_WORKER_EXITING) {
DEBUG(1, ("Invalid num clients, stopping!\n"));
}
pf->status = PF_WORKER_EXITING;
pf->num_clients = -1;
}
}
bool pfh_child_allowed_to_accept(struct pf_worker_data *pf)
{
if (pf->status == PF_WORKER_EXITING ||
pf->status == PF_WORKER_ACCEPTING) {
return false;
}
return (pf->num_clients < pf->allowed_clients);
}
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