[glib] thread: Remove the zero_thread

[Ryan Lortie <ryanl src gnome org>]

commit ed35d2719ba60fe36032db6eae5e07cd45b4fe1c
Author: Ryan Lortie <desrt desrt ca>
Date:   Wed Oct 12 18:22:31 2011 -0400

    thread: Remove the zero_thread
    
    This was only used for redundant assertion checks.

 glib/deprecated/gthread-deprecated.c |    2 --
 glib/gthread.c                       |    8 +-------
 glib/gthreadprivate.h                |    1 -
 3 files changed, 1 insertions(+), 10 deletions(-)
---
diff --git a/glib/deprecated/gthread-deprecated.c b/glib/deprecated/gthread-deprecated.c
index 0a53fe2..46d8b85 100644
--- a/glib/deprecated/gthread-deprecated.c
+++ b/glib/deprecated/gthread-deprecated.c
@@ -148,8 +148,6 @@ guint64 (*g_thread_gettime) (void) = gettime;
 
 /* Initialisation {{{1 ---------------------------------------------------- */
 gboolean         g_threads_got_initialized = TRUE;
-GSystemThread    zero_thread; /* This is initialized to all zero */
-
 
 /**
  * g_thread_init:
diff --git a/glib/gthread.c b/glib/gthread.c
index 9e6f31e..4704227 100644
--- a/glib/gthread.c
+++ b/glib/gthread.c
@@ -677,11 +677,7 @@ g_thread_cleanup (gpointer data)
        * If it is, the structure is freed in g_thread_join()
        */
       if (!thread->thread.joinable)
-        {
-          /* Just to make sure, this isn't used any more */
-          g_system_thread_assign (thread->system_thread, zero_thread);
-          g_free (thread);
-        }
+        g_free (thread);
     }
 }
 
@@ -891,7 +887,6 @@ g_thread_join (GThread *thread)
 
   g_return_val_if_fail (thread, NULL);
   g_return_val_if_fail (thread->joinable, NULL);
-  g_return_val_if_fail (!g_system_thread_equal (&real->system_thread, &zero_thread), NULL);
 
   g_system_thread_join (&real->system_thread);
 
@@ -899,7 +894,6 @@ g_thread_join (GThread *thread)
 
   /* Just to make sure, this isn't used any more */
   thread->joinable = 0;
-  g_system_thread_assign (real->system_thread, zero_thread);
 
   /* the thread structure for non-joinable threads is freed upon
    * thread end. We free the memory here. This will leave a loose end,
diff --git a/glib/gthreadprivate.h b/glib/gthreadprivate.h
index 2b42620..2d6bc4f 100644
--- a/glib/gthreadprivate.h
+++ b/glib/gthreadprivate.h
@@ -72,7 +72,6 @@ struct  _GRealThread
   GSystemThread system_thread;
 };
 
-G_GNUC_INTERNAL extern GSystemThread zero_thread;
 G_GNUC_INTERNAL extern GMutex g_once_mutex;
 
 /* initializers that may also use g_private_new() */