[clutter] Use a static mutex for the default Clutter lock

[Emmanuele Bassi <ebassi src gnome org>]

commit 32b8217027a1bafa2b9ff1780253b2f849d708ea
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Fri Oct 7 15:08:27 2011 +0100

    Use a static mutex for the default Clutter lock
    
    The Big Clutter Lockâ can now be a static GMutex, since GLib supports
    them. We can also drop a bunch of checks given the recent changes in
    GLib threading API.

 clutter/clutter-main.c |   20 +++++---------------
 1 files changed, 5 insertions(+), 15 deletions(-)
---
diff --git a/clutter/clutter-main.c b/clutter/clutter-main.c
index 461c87d..9fe9acd 100644
--- a/clutter/clutter-main.c
+++ b/clutter/clutter-main.c
@@ -119,7 +119,7 @@ static ClutterMainContext *ClutterCntx       = NULL;
 G_LOCK_DEFINE_STATIC (ClutterCntx);
 
 /* main lock and locking/unlocking functions */
-static GMutex *clutter_threads_mutex         = NULL;
+static GMutex clutter_threads_mutex;
 static GCallback clutter_threads_lock        = NULL;
 static GCallback clutter_threads_unlock      = NULL;
 
@@ -694,15 +694,13 @@ clutter_main (void)
 static void
 clutter_threads_impl_lock (void)
 {
-  if (G_LIKELY (clutter_threads_mutex != NULL))
-    g_mutex_lock (clutter_threads_mutex);
+  g_mutex_lock (&clutter_threads_mutex);
 }
 
 static void
 clutter_threads_impl_unlock (void)
 {
-  if (G_LIKELY (clutter_threads_mutex != NULL))
-    g_mutex_unlock (clutter_threads_mutex);
+  g_mutex_unlock (&clutter_threads_mutex);
 }
 
 /**
@@ -723,18 +721,10 @@ clutter_threads_impl_unlock (void)
 void
 clutter_threads_init (void)
 {
-  if (!g_thread_supported ())
-    g_error ("g_thread_init() must be called before clutter_threads_init()");
-
-  if (clutter_threads_mutex != NULL)
-    return;
-
-  clutter_threads_mutex = g_mutex_new ();
-
-  if (!clutter_threads_lock)
+  if (clutter_threads_lock == NULL)
     clutter_threads_lock = clutter_threads_impl_lock;
 
-  if (!clutter_threads_unlock)
+  if (clutter_threads_unlock == NULL)
     clutter_threads_unlock = clutter_threads_impl_unlock;
 }