ports/sysdeps/tile/nptl/pthread_spin_trylock.c

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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 <errno.h>
  21
  22 #ifdef __tilegx__
  23 #define TNS(p) __insn_exch4((p), 1)
  24 #else
  25 #define TNS(p) __insn_tns(p)
  26 #endif
  27
  28 int
  29 pthread_spin_trylock (pthread_spinlock_t *lock)
  30 {
  31   return (TNS (lock) == 0) ? 0 : EBUSY;
  32 }