From: Roland McGrath <roland@hack.frob.com>
Date: Mon, 7 Jul 2014 16:29:34 +0000 (-0700)
Subject: Remove old stub lowlevellock.h file.  It is not even useful as documentation.
X-Git-Tag: glibc-2.20~136
X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=f4c4021bc0fc5c3aaff8418ecfe0c1c8bbb49859;p=glibc.git

Remove old stub lowlevellock.h file.  It is not even useful as documentation.
---

diff --git a/ChangeLog b/ChangeLog
index ac35437275..5b31532e4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2014-07-07  Roland McGrath  <roland@hack.frob.com>
 
+	* sysdeps/nptl/lowlevellock.h: File removed.
+
 	* NEWS: NPTL is no longer an add-on!
 	* nptl/internaltypes.h: Moved ...
 	* sysdeps/nptl/internaltypes.h: ... here.
diff --git a/sysdeps/nptl/lowlevellock.h b/sysdeps/nptl/lowlevellock.h
deleted file mode 100644
index 7d1913a58d..0000000000
--- a/sysdeps/nptl/lowlevellock.h
+++ /dev/null
@@ -1,83 +0,0 @@
-/* Low level locking macros used in NPTL implementation.  Stub version.
-   Copyright (C) 2002-2014 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
-
-   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 <atomic.h>
-
-
-/* Mutex lock counter:
-   bit 31 clear means unlocked;
-   bit 31 set means locked.
-
-   All code that looks at bit 31 first increases the 'number of
-   interested threads' usage counter, which is in bits 0-30.
-
-   All negative mutex values indicate that the mutex is still locked.  */
-
-
-static inline void
-__generic_mutex_lock (int *mutex)
-{
-  unsigned int v;
-
-  /* Bit 31 was clear, we got the mutex.  (this is the fastpath).  */
-  if (atomic_bit_test_set (mutex, 31) == 0)
-    return;
-
-  atomic_increment (mutex);
-
-  while (1)
-    {
-      if (atomic_bit_test_set (mutex, 31) == 0)
-	{
-	  atomic_decrement (mutex);
-	  return;
-	}
-
-      /* We have to wait now. First make sure the futex value we are
-	 monitoring is truly negative (i.e. locked). */
-      v = *mutex;
-      if (v >= 0)
-	continue;
-
-      lll_futex_wait (mutex, v,
-		      // XYZ check mutex flag
-		      LLL_SHARED);
-    }
-}
-
-
-static inline void
-__generic_mutex_unlock (int *mutex)
-{
-  /* Adding 0x80000000 to the counter results in 0 if and only if
-     there are not other interested threads - we can return (this is
-     the fastpath).  */
-  if (atomic_add_zero (mutex, 0x80000000))
-    return;
-
-  /* There are other threads waiting for this mutex, wake one of them
-     up.  */
-  lll_futex_wake (mutex, 1,
-		  // XYZ check mutex flag
-		  LLL_SHARED);
-}
-
-
-#define lll_mutex_lock(futex) __generic_mutex_lock (&(futex))
-#define lll_mutex_unlock(futex) __generic_mutex_unlock (&(futex))