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| author | Austin Foxley <austinf@cetoncorp.com> | 2009-10-17 12:26:24 -0700 |
|---|---|---|
| committer | Austin Foxley <austinf@cetoncorp.com> | 2009-10-17 12:26:24 -0700 |
| commit | c68d0fa2d88fc2134a38d99e7e944828384a7671 (patch) | |
| tree | 6596943bd1c77f18d6e49d4153ddd3f3d67b49f5 /libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S | |
| parent | 9a03e98a3b418f33c347a6023e9320f3a42cb9e4 (diff) | |
| download | uClibc-alpine-c68d0fa2d88fc2134a38d99e7e944828384a7671.tar.bz2 uClibc-alpine-c68d0fa2d88fc2134a38d99e7e944828384a7671.tar.xz | |
libpthread/nptl: core of the "Native Posix Threading Library" for uClibc
targetting arm,sh,i386,mips,sparc for now
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S b/libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S new file mode 100644 index 000000000..9b5133583 --- /dev/null +++ b/libpthread/nptl/sysdeps/x86_64/pthread_spin_trylock.S @@ -0,0 +1,40 @@ +/* Copyright (C) 2002, 2003 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. */ + +#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 $1, %eax + xorl %ecx, %ecx + LOCK + cmpxchgl %ecx, (%rdi) + movl $EBUSY, %eax + cmovel %ecx, %eax + retq + .size pthread_spin_trylock,.-pthread_spin_trylock |