From: Adam Dickmeiss <adam@indexdata.dk>
Date: Tue, 20 Apr 2010 10:52:36 +0000 (+0200)
Subject: Lock connection host->mutex in connection_handler
X-Git-Tag: v1.4.0~35
X-Git-Url: http://sru.miketaylor.org.uk/?a=commitdiff_plain;h=f69f282f792a3a4d66257e83ac5d400b87a2a268;p=pazpar2-moved-to-github.git

Lock connection host->mutex in connection_handler

If a timeout occurs when a client exists and is non-Idle, the timeout
is ignored. This ensures that if a timeout happens after a connection
is picked up in client_prep_connection, then it is not destroyed
(soon after).

In connection_create, move code that adds connection to host list to
the end of the creation phase.
---

diff --git a/src/connection.c b/src/connection.c
index e765435..f17e5da 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -94,7 +94,6 @@ static void remove_connection_from_host(struct connection *con)
 {
     struct connection **conp = &con->host->connections;
     assert(con);
-    yaz_mutex_enter(con->host->mutex);
     while (*conp)
     {
         if (*conp == con)
@@ -104,7 +103,6 @@ static void remove_connection_from_host(struct connection *con)
         }
         conp = &(*conp)->next;
     }
-    yaz_mutex_leave(con->host->mutex);
 }
 
 // Close connection and recycle structure
@@ -140,11 +138,6 @@ static struct connection *connection_create(struct client *cl,
     new = xmalloc(sizeof(*new));
     new->host = host;
 
-    yaz_mutex_enter(host->mutex);
-    new->next = new->host->connections;
-    new->host->connections = new;
-    yaz_mutex_leave(host->mutex);
-
     new->client = cl;
     new->zproxy = 0;
     client_set_connection(cl, new);
@@ -154,6 +147,12 @@ static struct connection *connection_create(struct client *cl,
     new->session_timeout = session_timeout;
     if (host->ipport)
         connection_connect(new, iochan_man);
+
+    yaz_mutex_enter(host->mutex);
+    new->next = new->host->connections;
+    new->host->connections = new;
+    yaz_mutex_leave(host->mutex);
+
     return new;
 }
 
@@ -241,7 +240,9 @@ static void connection_handler(IOCHAN iochan, int event)
 {
     struct connection *co = iochan_getdata(iochan);
     struct client *cl = co->client;
+    struct host *host = co->host;
 
+    yaz_mutex_enter(host->mutex);
     if (!cl) 
     {
         /* no client associated with it.. We are probably getting
@@ -249,20 +250,23 @@ static void connection_handler(IOCHAN iochan, int event)
            package.. We will just close the connection */
         yaz_log(YLOG_LOG, "timeout connection %p event=%d", co, event);
         connection_destroy(co);
-        return;
     }
-    if (event & EVENT_TIMEOUT)
+    else if (event & EVENT_TIMEOUT)
     {
         if (co->state == Conn_Connecting)
         {
             yaz_log(YLOG_WARN,  "connect timeout %s", client_get_url(cl));
             client_fatal(cl);
         }
-        else
+        else if (client_get_state(co->client) == Client_Idle)
         {
             yaz_log(YLOG_LOG,  "idle timeout %s", client_get_url(cl));
             connection_destroy(co);
         }
+        else
+        {
+            yaz_log(YLOG_LOG,  "ignore timeout %s", client_get_url(cl));
+        }
     }
     else
     {
@@ -272,6 +276,7 @@ static void connection_handler(IOCHAN iochan, int event)
         
         non_block_events(co);
     }
+    yaz_mutex_leave(host->mutex);
 }