re PR libgomp/27254 (FAIL: libgomp.fortran/reduction6.f90)

	PR libgomp/27254
	* io/unit.c (get_internal_unit): Initialize and lock thread mutex
	for internal units.

From-SVN: r114765

libgfortran/ChangeLog

+2006-06-18  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR libgomp/27254
+	* io/unit.c (get_internal_unit): Initialize and lock thread mutex
+	for internal units.
+
 2006-06-06  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	* m4/in_pack.m4: Add TODO comment about detecting temporaries,

libgfortran/io/unit.c

@@ -376,6 +376,15 @@ get_internal_unit (st_parameter_dt *dtp)
     }
 
   memset (iunit, '\0', sizeof (gfc_unit));
+#ifdef __GTHREAD_MUTEX_INIT
+  {
+    __gthread_mutex_t tmp = __GTHREAD_MUTEX_INIT;
+    iunit->lock = tmp;
+  }
+#else
+  __GTHREAD_MUTEX_INIT_FUNCTION (&iunit->lock);
+#endif
+  __gthread_mutex_lock (&iunit->lock);
 
   iunit->recl = dtp->internal_unit_len;