nptl/sysdeps/unix/sysv/linux/x86/elision-unlock.c

   1 /* elision-unlock.c: Commit an elided pthread lock.
   2    Copyright (C) 2013-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include "pthreadP.h"
  20 #include "lowlevellock.h"
  21 #include "hle.h"
  22
  23 int
  24 __lll_unlock_elision(int *lock, int private)
  25 {
  26   /* When the lock was free we're in a transaction.
  27      When you crash here you unlocked a free lock.  */
  28   if (*lock == 0)
  29     _xend();
  30   else
  31     lll_unlock ((*lock), private);
  32   return 0;
  33 }