Commit d72f436b authored by Ondřej Surý's avatar Ondřej Surý

Replace atomic operations in bin/named/client.c with isc_refcount reference counting

(cherry picked from commit ef49780d)
parent a3a6947a
Pipeline #13943 passed with stages
in 17 minutes and 22 seconds
......@@ -428,12 +428,10 @@ tcpconn_detach(ns_client_t *client) {
static void
mark_tcp_active(ns_client_t *client, bool active) {
if (active && !client->tcpactive) {
isc_atomic_xadd(&client->interface->ntcpactive, 1);
isc_refcount_increment0(&client->interface->ntcpactive, NULL);
client->tcpactive = active;
} else if (!active && client->tcpactive) {
uint32_t old =
isc_atomic_xadd(&client->interface->ntcpactive, -1);
INSIST(old > 0);
isc_refcount_decrement(&client->interface->ntcpactive, NULL);
client->tcpactive = active;
}
}
......@@ -580,7 +578,7 @@ exit_check(ns_client_t *client) {
if (client->mortal && TCP_CLIENT(client) &&
client->newstate != NS_CLIENTSTATE_FREED &&
(client->sctx->options & NS_SERVER_CLIENTTEST) == 0 &&
isc_atomic_xadd(&client->interface->ntcpaccepting, 0) == 0)
isc_refcount_current(&client->interface->ntcpaccepting) == 0)
{
/* Nobody else is accepting */
client->mortal = false;
......@@ -3306,7 +3304,6 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
ns_client_t *client = event->ev_arg;
isc_socket_newconnev_t *nevent = (isc_socket_newconnev_t *)event;
dns_aclenv_t *env = ns_interfacemgr_getaclenv(client->interface->mgr);
uint32_t old;
REQUIRE(event->ev_type == ISC_SOCKEVENT_NEWCONN);
REQUIRE(NS_CLIENT_VALID(client));
......@@ -3326,8 +3323,7 @@ client_newconn(isc_task_t *task, isc_event_t *event) {
INSIST(client->naccepts == 1);
client->naccepts--;
old = isc_atomic_xadd(&client->interface->ntcpaccepting, -1);
INSIST(old > 0);
isc_refcount_decrement(&client->interface->ntcpaccepting, NULL);
/*
* We must take ownership of the new socket before the exit
......@@ -3457,8 +3453,8 @@ client_accept(ns_client_t *client) {
* quota is tcp-clients plus the number of listening
* interfaces plus 1.)
*/
exit = (isc_atomic_xadd(&client->interface->ntcpactive, 0) >
(client->tcpactive ? 1 : 0));
exit = (isc_refcount_current(&client->interface->ntcpactive) >
(client->tcpactive ? 1U : 0U));
if (exit) {
client->newstate = NS_CLIENTSTATE_INACTIVE;
(void)exit_check(client);
......@@ -3516,7 +3512,7 @@ client_accept(ns_client_t *client) {
* listening for connections itself to prevent the interface
* going dead.
*/
isc_atomic_xadd(&client->interface->ntcpaccepting, 1);
isc_refcount_increment0(&client->interface->ntcpaccepting, NULL);
}
static void
......
......@@ -45,6 +45,7 @@
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/socket.h>
#include <isc/refcount.h>
#include <dns/geoip.h>
#include <dns/result.h>
......@@ -76,11 +77,11 @@ struct ns_interface {
/*%< UDP dispatchers. */
isc_socket_t * tcpsocket; /*%< TCP socket. */
isc_dscp_t dscp; /*%< "listen-on" DSCP value */
int32_t ntcpaccepting; /*%< Number of clients
isc_refcount_t ntcpaccepting; /*%< Number of clients
ready to accept new
TCP connections on this
interface */
int32_t ntcpactive; /*%< Number of clients
isc_refcount_t ntcpactive; /*%< Number of clients
servicing TCP queries
(whether accepting or
connected) */
......
......@@ -429,8 +429,8 @@ ns_interface_create(ns_interfacemgr_t *mgr, isc_sockaddr_t *addr,
* connections will be handled in parallel even though there is
* only one client initially.
*/
ifp->ntcpaccepting = 0;
ifp->ntcpactive = 0;
isc_refcount_init(&ifp->ntcpaccepting, 0);
isc_refcount_init(&ifp->ntcpactive, 0);
ifp->nudpdispatch = 0;
......@@ -663,6 +663,9 @@ ns_interface_destroy(ns_interface_t *ifp) {
ns_interfacemgr_detach(&ifp->mgr);
isc_refcount_destroy(&ifp->ntcpactive);
isc_refcount_destroy(&ifp->ntcpaccepting);
ifp->magic = 0;
isc_mem_put(mctx, ifp, sizeof(*ifp));
}
......
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