diff options
Diffstat (limited to 'sysdeps/i386/pthread_spin_trylock.S')
| -rw-r--r-- | sysdeps/i386/pthread_spin_trylock.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/i386/pthread_spin_trylock.S b/sysdeps/i386/pthread_spin_trylock.S new file mode 100644 index 0000000000..36979bdd1d --- /dev/null +++ b/sysdeps/i386/pthread_spin_trylock.S @@ -0,0 +1,46 @@ +/* Copyright (C) 2002-2016 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 <pthread-errnos.h> + + +#ifdef UP +# define LOCK +#else +# define LOCK lock +#endif + + .globl pthread_spin_trylock + .type pthread_spin_trylock,@function + .align 16 +pthread_spin_trylock: + movl 4(%esp), %edx + movl $1, %eax + xorl %ecx, %ecx + LOCK + cmpxchgl %ecx, (%edx) + movl $EBUSY, %eax +#ifdef HAVE_CMOV + cmovel %ecx, %eax +#else + jne 0f + movl %ecx, %eax +0: +#endif + ret + .size pthread_spin_trylock,.-pthread_spin_trylock |