diff options
Diffstat (limited to 'nptl/sysdeps/i386/i486/pthread_spin_trylock.S')
-rw-r--r-- | nptl/sysdeps/i386/i486/pthread_spin_trylock.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/nptl/sysdeps/i386/i486/pthread_spin_trylock.S b/nptl/sysdeps/i386/i486/pthread_spin_trylock.S new file mode 100644 index 0000000000..abda929c81 --- /dev/null +++ b/nptl/sysdeps/i386/i486/pthread_spin_trylock.S @@ -0,0 +1,48 @@ +/* Copyright (C) 2002 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define EBUSY 16 + + +#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, %edx + movl %ecx, %eax +#ifdef HAVE_CMOV + cmovnel %edx, %eax +#else + je 0f + movl %edx, %eax +0: +#endif + ret + .size pthread_spin_trylock,.-pthread_spin_trylock |