sysdeps/sparc/sparc32/pthread_spin_trylock.S

   1 /* Copyright (C) 2012-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <pthread-errnos.h>
  20
  21         .text
  22 ENTRY(pthread_spin_trylock)
  23         ldstub          [%o0], %o0
  24         cmp             %o0, 0
  25         bne,a           1f
  26          mov            EBUSY, %o0
  27 1:      retl
  28          nop
  29 END(pthread_spin_trylock)