Clean up __exit_thread.

sysdeps/unix/sysv/linux/exit-thread.h

@@ -0,0 +1,38 @@
+/* Call to terminate the current thread.  Linux version.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* This causes the current thread to exit, without affecting other
+   threads in the process if there are any.  If there are no other
+   threads left, then this has the effect of _exit (0).  */
+
+static inline void __attribute__ ((noreturn, always_inline, unused))
+__exit_thread (void)
+{
+  /* Doing this in a loop is mostly just to satisfy the compiler that the
+     function really qualifies as noreturn.  It also means that in some
+     pathological situation where the system call does not get made or does
+     not work, the thread will simply spin rather than running off the end
+     of the caller and doing unexpectedly strange things.  */
+  while (1)
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      INTERNAL_SYSCALL (exit, err, 1, 0);
+    }
+}