qio: Factor out helpers qio_net_listener_[un]watch

The code had three similar repetitions of an iteration over one or all
of nsiocs to set up a GSource, and likewise for teardown.  Since an
upcoming patch wants to tweak whether GSource or AioContext is used,
it's better to consolidate that into one helper function for fewer
places to edit later.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20251113011625.878876-22-eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

diff --git a/io/net-listener.c b/io/net-listener.c
index 93100a2d25358d8d780ec2134e4d0efaf7790a61..9a94b153279eb37053befcd7fcbb2a48c06742a9 100644 (file)
--- a/io/net-listener.c
+++ b/io/net-listener.c
@@ -120,13 +120,54 @@ int qio_net_listener_open_sync(QIONetListener *listener,
     }
 }
 
+/*
+ * i == 0 to set watch on entire array, non-zero to only set watch on
+ * recent additions when earlier entries are already watched.
+ *
+ * listener->lock must be held by caller.
+ */
+static void
+qio_net_listener_watch(QIONetListener *listener, size_t i, const char *caller)
+{
+    if (!listener->io_func) {
+        return;
+    }
+
+    trace_qio_net_listener_watch(listener, listener->io_func,
+                                 listener->context, caller);
+    for ( ; i < listener->nsioc; i++) {
+        object_ref(OBJECT(listener));
+        listener->io_source[i] = qio_channel_add_watch_source(
+            QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
+            qio_net_listener_channel_func,
+            listener, (GDestroyNotify)object_unref, listener->context);
+    }
+}
+
+/* listener->lock must be held by caller. */
+static void
+qio_net_listener_unwatch(QIONetListener *listener, const char *caller)
+{
+    size_t i;
+
+    if (!listener->io_func) {
+        return;
+    }
+
+    trace_qio_net_listener_unwatch(listener, listener->io_func,
+                                   listener->context, caller);
+    for (i = 0; i < listener->nsioc; i++) {
+        if (listener->io_source[i]) {
+            g_source_destroy(listener->io_source[i]);
+            g_source_unref(listener->io_source[i]);
+            listener->io_source[i] = NULL;
+        }
+    }
+}
 
 void qio_net_listener_add(QIONetListener *listener,
                           QIOChannelSocket *sioc)
 {
-    QIONetListenerClientFunc io_func;
-    GMainContext *context;
-
     if (listener->name) {
         qio_channel_set_name(QIO_CHANNEL(sioc), listener->name);
     }
@@ -142,21 +183,9 @@ void qio_net_listener_add(QIONetListener *listener,
     object_ref(OBJECT(sioc));
     listener->connected = true;
 
-    WITH_QEMU_LOCK_GUARD(&listener->lock) {
-        io_func = listener->io_func;
-        context = listener->context;
-    }
-
-    trace_qio_net_listener_watch(listener, io_func, context, "add");
-    if (io_func) {
-        object_ref(OBJECT(listener));
-        listener->io_source[listener->nsioc] = qio_channel_add_watch_source(
-            QIO_CHANNEL(listener->sioc[listener->nsioc]), G_IO_IN,
-            qio_net_listener_channel_func,
-            listener, (GDestroyNotify)object_unref, context);
-    }
-
+    QEMU_LOCK_GUARD(&listener->lock);
     listener->nsioc++;
+    qio_net_listener_watch(listener, listener->nsioc - 1, "add");
 }
 
 
@@ -166,25 +195,13 @@ void qio_net_listener_set_client_func_full(QIONetListener *listener,
                                            GDestroyNotify notify,
                                            GMainContext *context)
 {
-    size_t i;
-
     QEMU_LOCK_GUARD(&listener->lock);
     if (listener->io_func == func && listener->io_data == data &&
         listener->io_notify == notify && listener->context == context) {
         return;
     }
 
-    trace_qio_net_listener_unwatch(listener, listener->io_func,
-                                   listener->context, "set_client_func");
-
-    for (i = 0; i < listener->nsioc; i++) {
-        if (listener->io_source[i]) {
-            g_source_destroy(listener->io_source[i]);
-            g_source_unref(listener->io_source[i]);
-            listener->io_source[i] = NULL;
-        }
-    }
-
+    qio_net_listener_unwatch(listener, "set_client_func");
     if (listener->io_notify) {
         listener->io_notify(listener->io_data);
     }
@@ -193,17 +210,7 @@ void qio_net_listener_set_client_func_full(QIONetListener *listener,
     listener->io_notify = notify;
     listener->context = context;
 
-    trace_qio_net_listener_watch(listener, listener->io_func,
-                                 listener->context, "set_client_func");
-    if (listener->io_func != NULL) {
-        for (i = 0; i < listener->nsioc; i++) {
-            object_ref(OBJECT(listener));
-            listener->io_source[i] = qio_channel_add_watch_source(
-                QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
-                qio_net_listener_channel_func,
-                listener, (GDestroyNotify)object_unref, context);
-        }
-    }
+    qio_net_listener_watch(listener, 0, "set_client_func");
 }
 
 void qio_net_listener_set_client_func(QIONetListener *listener,
@@ -254,21 +261,9 @@ QIOChannelSocket *qio_net_listener_wait_client(QIONetListener *listener)
         .loop = loop
     };
     size_t i;
-    QIONetListenerClientFunc io_func;
-    GMainContext *context;
 
     WITH_QEMU_LOCK_GUARD(&listener->lock) {
-        io_func = listener->io_func;
-        context = listener->context;
-    }
-
-    trace_qio_net_listener_unwatch(listener, io_func, context, "wait_client");
-    for (i = 0; i < listener->nsioc; i++) {
-        if (listener->io_source[i]) {
-            g_source_destroy(listener->io_source[i]);
-            g_source_unref(listener->io_source[i]);
-            listener->io_source[i] = NULL;
-        }
+        qio_net_listener_unwatch(listener, "wait_client");
     }
 
     sources = g_new0(GSource *, listener->nsioc);
@@ -292,15 +287,8 @@ QIOChannelSocket *qio_net_listener_wait_client(QIONetListener *listener)
     g_main_loop_unref(loop);
     g_main_context_unref(ctxt);
 
-    trace_qio_net_listener_watch(listener, io_func, context, "wait_client");
-    if (io_func != NULL) {
-        for (i = 0; i < listener->nsioc; i++) {
-            object_ref(OBJECT(listener));
-            listener->io_source[i] = qio_channel_add_watch_source(
-                QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
-                qio_net_listener_channel_func,
-                listener, (GDestroyNotify)object_unref, context);
-        }
+    WITH_QEMU_LOCK_GUARD(&listener->lock) {
+        qio_net_listener_watch(listener, 0, "wait_client");
     }
 
     return data.sioc;
@@ -315,14 +303,8 @@ void qio_net_listener_disconnect(QIONetListener *listener)
     }
 
     QEMU_LOCK_GUARD(&listener->lock);
-    trace_qio_net_listener_unwatch(listener, listener->io_func,
-                                   listener->context, "disconnect");
+    qio_net_listener_unwatch(listener, "disconnect");
     for (i = 0; i < listener->nsioc; i++) {
-        if (listener->io_source[i]) {
-            g_source_destroy(listener->io_source[i]);
-            g_source_unref(listener->io_source[i]);
-            listener->io_source[i] = NULL;
-        }
         qio_channel_close(QIO_CHANNEL(listener->sioc[i]), NULL);
     }
     listener->connected = false;