static void *sel_thread_handler(void *vp)
{
sel_thread_t p = (sel_thread_t) vp;
while (1)
{
struct work_item *work_this = 0;
/* wait for some work */
yaz_mutex_enter(p->mutex);
while (!p->stop_flag && !p->input_queue)
yaz_cond_wait(p->input_data, p->mutex, 0);
/* see if we were waken up because we're shutting down */
if (p->stop_flag)
break;
/* got something. Take the last one out of input_queue */
assert(p->input_queue);
work_this = queue_remove_last(&p->input_queue);
input_queue_length--;
#if 0
yaz_log(YLOG_DEBUG, "input queue length after pop: %d", input_queue_length);
#endif
assert(work_this);
yaz_mutex_leave(p->mutex);
/* work on this item */
p->work_handler(work_this->data);
/* put it back into output queue */
yaz_mutex_enter(p->mutex);
work_this->next = p->output_queue;
p->output_queue = work_this;
yaz_mutex_leave(p->mutex);
/* wake up select/poll with a single byte */
#ifdef WIN32
(void) send(p->write_fd, "", 1, 0);
#else
(void) write(p->write_fd, "", 1);
#endif
}
yaz_mutex_leave(p->mutex);
return 0;
}
// Ensure that client has a connection associated
int client_prep_connection(struct client *cl,
int operation_timeout, int session_timeout,
iochan_man_t iochan_man,
const struct timeval *abstime)
{
struct connection *co;
struct session_database *sdb = client_get_database(cl);
const char *zproxy = session_setting_oneval(sdb, PZ_ZPROXY);
const char *url = session_setting_oneval(sdb, PZ_URL);
const char *sru = session_setting_oneval(sdb, PZ_SRU);
struct host *host = 0;
int default_port = *sru ? 80 : 210;
if (zproxy && zproxy[0] == '\0')
zproxy = 0;
if (!url || !*url)
url = sdb->database->id;
host = find_host(client_get_session(cl)->service->server->database_hosts,
url, zproxy, default_port, iochan_man);
yaz_log(YLOG_DEBUG, "client_prep_connection: target=%s url=%s",
client_get_id(cl), url);
if (!host)
return 0;
co = client_get_connection(cl);
if (co)
{
assert(co->host);
if (co->host == host && client_get_state(cl) == Client_Idle)
{
return 2;
}
client_incref(cl);
connection_release(co);
co = 0;
}
if (!co)
{
int max_connections = 0;
int reuse_connections = 1;
const char *v = session_setting_oneval(client_get_database(cl),
PZ_MAX_CONNECTIONS);
if (v && *v)
max_connections = atoi(v);
v = session_setting_oneval(client_get_database(cl),
PZ_REUSE_CONNECTIONS);
if (v && *v)
reuse_connections = atoi(v);
// See if someone else has an idle connection
// We should look at timestamps here to select the longest-idle connection
yaz_mutex_enter(host->mutex);
while (1)
{
int num_connections = 0;
for (co = host->connections; co; co = co->next)
num_connections++;
if (reuse_connections)
{
for (co = host->connections; co; co = co->next)
{
if (connection_is_idle(co) &&
(!co->client || client_get_state(co->client) == Client_Idle) &&
!strcmp(ZOOM_connection_option_get(co->link, "user"),
session_setting_oneval(client_get_database(cl),
PZ_AUTHENTICATION)))
{
if (zproxy == 0 && co->zproxy == 0)
break;
if (zproxy && co->zproxy && !strcmp(zproxy, co->zproxy))
break;
}
}
if (co)
{
yaz_log(YLOG_LOG, "num_connections = %d (reusing)", num_connections);
break;
}
}
if (max_connections <= 0 || num_connections < max_connections)
{
yaz_log(YLOG_LOG, "num_connections = %d (new); max = %d",
num_connections, max_connections);
break;
}
yaz_log(YLOG_LOG, "num_connections = %d (waiting) max = %d",
num_connections, max_connections);
if (yaz_cond_wait(host->cond_ready, host->mutex, abstime))
{
yaz_log(YLOG_LOG, "out of connections %s", client_get_id(cl));
client_set_state(cl, Client_Error);
yaz_mutex_leave(host->mutex);
return 0;
}
}
if (co)
{
yaz_log(YLOG_LOG, "%p Connection reuse. state: %d", co, co->state);
connection_release(co);
client_set_connection(cl, co);
co->client = cl;
/* ensure that connection is only assigned to this client
by marking the client non Idle */
client_set_state(cl, Client_Working);
yaz_mutex_leave(host->mutex);
co->operation_timeout = operation_timeout;
co->session_timeout = session_timeout;
/* tells ZOOM to reconnect if necessary. Disabled becuase
the ZOOM_connection_connect flushes the task queue */
ZOOM_connection_connect(co->link, 0, 0);
}
else
{
yaz_mutex_leave(host->mutex);
co = connection_create(cl, host, operation_timeout, session_timeout,
iochan_man);
}
assert(co->host);
}
if (co && co->link)
return 1;
else
return 0;
}
