Add facility to track total connections in use

[pazpar2-moved-to-github.git] / src / connection.c

diff --git a/src/connection.c b/src/connection.c
index 1526938..8170590 100644 (file)
--- a/src/connection.c
+++ b/src/connection.c
@@ -47,6 +47,25 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "client.h"
 #include "settings.h"
 
+/* connection counting (1) , disable connection counting (0) */
+#if 0
+static YAZ_MUTEX g_mutex = 0;
+static int no_connections = 0;
+
+static void connection_use(int delta)
+{
+    if (!g_mutex)
+        yaz_mutex_create(&g_mutex);
+    yaz_mutex_enter(g_mutex);
+    no_connections += delta;
+    yaz_mutex_leave(g_mutex);
+    yaz_log(YLOG_LOG, "%s connections=%d", delta > 0 ? "INC" : "DEC",
+            no_connections);
+}
+#else
+#define connection_use(x)
+#endif
+
 
 /** \brief Represents a physical, reusable  connection to a remote Z39.50 host
  */
@@ -123,6 +142,7 @@ static void connection_destroy(struct connection *co)
     remove_connection_from_host(co);
     xfree(co->zproxy);
     xfree(co);
+    connection_use(-1);
 }
 
 // Creates a new connection for client, associated with the host of 
@@ -132,28 +152,29 @@ static struct connection *connection_create(struct client *cl,
                                             int session_timeout,
                                             iochan_man_t iochan_man)
 {
-    struct connection *new;
+    struct connection *co;
     struct host *host = client_get_host(cl);
 
-    new = xmalloc(sizeof(*new));
-    new->host = host;
+    co = xmalloc(sizeof(*co));
+    co->host = host;
 
-    new->client = cl;
-    new->zproxy = 0;
-    client_set_connection(cl, new);
-    new->link = 0;
-    new->state = Conn_Resolving;
-    new->operation_timeout = operation_timeout;
-    new->session_timeout = session_timeout;
+    co->client = cl;
+    co->zproxy = 0;
+    client_set_connection(cl, co);
+    co->link = 0;
+    co->state = Conn_Resolving;
+    co->operation_timeout = operation_timeout;
+    co->session_timeout = session_timeout;
     if (host->ipport)
-        connection_connect(new, iochan_man);
+        connection_connect(co, iochan_man);
 
     yaz_mutex_enter(host->mutex);
-    new->next = new->host->connections;
-    new->host->connections = new;
+    co->next = co->host->connections;
+    co->host->connections = co;
     yaz_mutex_leave(host->mutex);
 
-    return new;
+    connection_use(1);
+    return co;
 }
 
 static void non_block_events(struct connection *co)
@@ -239,10 +260,11 @@ void connection_continue(struct connection *co)
 static void connection_handler(IOCHAN iochan, int event)
 {
     struct connection *co = iochan_getdata(iochan);
-    struct client *cl = co->client;
+    struct client *cl;
     struct host *host = co->host;
 
     yaz_mutex_enter(host->mutex);
+    cl = co->client;
     if (!cl) 
     {
         /* no client associated with it.. We are probably getting
@@ -258,8 +280,8 @@ static void connection_handler(IOCHAN iochan, int event)
         {
             yaz_log(YLOG_WARN,  "connect timeout %s", client_get_url(cl));
 
-            connection_destroy(co);
             client_set_state(cl, Client_Error);
+            connection_destroy(co);
         }
         else if (client_get_state(co->client) == Client_Idle)
         {
@@ -288,7 +310,7 @@ static void connection_handler(IOCHAN iochan, int event)
 
 
 // Disassociate connection from client
-void connection_release(struct connection *co)
+static void connection_release(struct connection *co)
 {
     struct client *cl = co->client;
 
@@ -439,11 +461,6 @@ static int connection_connect(struct connection *con, iochan_man_t iochan_man)
     return 0;
 }
 
-const char *connection_get_url(struct connection *co)
-{
-    return client_get_url(co->client);
-}
-
 // Ensure that client has a connection associated
 int client_prep_connection(struct client *cl,
                            int operation_timeout, int session_timeout,