From a90ebccc072efa17313fe68c737b3507247c37dd Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 8 Apr 2010 03:01:05 +0200
Subject: [PATCH] unit: shortcut unit_notify() early, if possible

---
 device.c  | 3 +++
 service.c | 3 +++
 socket.c  | 3 +++
 target.c  | 3 +++
 4 files changed, 12 insertions(+)

diff --git a/device.c b/device.c
index 25661e05..d99038f7 100644
--- a/device.c
+++ b/device.c
@@ -49,6 +49,9 @@ static void device_set_state(Device *d, DeviceState state) {
         DeviceState old_state;
         assert(d);
 
+        if (state == d->state)
+                return;
+
         old_state = d->state;
         d->state = state;
 
diff --git a/service.c b/service.c
index 7ed9783f..74d03dbe 100644
--- a/service.c
+++ b/service.c
@@ -968,6 +968,9 @@ static void service_set_state(Service *s, ServiceState state) {
             state == SERVICE_AUTO_RESTART)
                 service_notify_sockets(s);
 
+        if (old_state == state)
+                return;
+
         log_debug("%s changed %s → %s", unit_id(UNIT(s)), service_state_to_string(old_state), service_state_to_string(state));
 
         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
diff --git a/socket.c b/socket.c
index 4e352250..617a49a0 100644
--- a/socket.c
+++ b/socket.c
@@ -391,6 +391,9 @@ static void socket_set_state(Socket *s, SocketState state) {
         if (state != SOCKET_LISTENING)
                 socket_unwatch_fds(s);
 
+        if (state == old_state)
+                return;
+
         log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 
         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
diff --git a/target.c b/target.c
index b8a7442f..c80c09d5 100644
--- a/target.c
+++ b/target.c
@@ -52,6 +52,9 @@ static void target_set_state(Target *t, TargetState state) {
         TargetState old_state;
         assert(t);
 
+        if (state == t->state)
+                return;
+
         old_state = t->state;
         t->state = state;
 
-- 
2.39.5