From 7b19da60f63fc060d90e1bd62b128ca10b1c6628 Mon Sep 17 00:00:00 2001 From: "Neal H. Walfield" Date: Thu, 11 Dec 2008 16:52:50 +0100 Subject: Create a generic spin-lock-inline.h using gcc's __sync primitives. 2008-12-11 Neal H. Walfield * sysdeps/generic/bits/spin-lock-inline.h: New file. --- libpthread/ChangeLog | 4 + libpthread/sysdeps/generic/bits/spin-lock-inline.h | 99 ++++++++++++++++++++++ 2 files changed, 103 insertions(+) create mode 100644 libpthread/sysdeps/generic/bits/spin-lock-inline.h diff --git a/libpthread/ChangeLog b/libpthread/ChangeLog index 8942404..0c7540c 100644 --- a/libpthread/ChangeLog +++ b/libpthread/ChangeLog @@ -1,3 +1,7 @@ +2008-12-11 Neal H. Walfield + + * sysdeps/generic/bits/spin-lock-inline.h: New file. + 2008-12-11 Neal H. Walfield * pthread/pt-alloc.c (__pthread_alloc): Use calloc, not malloc, to diff --git a/libpthread/sysdeps/generic/bits/spin-lock-inline.h b/libpthread/sysdeps/generic/bits/spin-lock-inline.h new file mode 100644 index 0000000..6c3e06e --- /dev/null +++ b/libpthread/sysdeps/generic/bits/spin-lock-inline.h @@ -0,0 +1,99 @@ +/* Machine-specific definitions for spin locks. Generic version. + Copyright (C) 2000, 2005, 2008 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* + * Never include this file directly; use or instead. + */ + +#ifndef _BITS_SPIN_LOCK_INLINE_H +#define _BITS_SPIN_LOCK_INLINE_H 1 + +#include +#include + +__BEGIN_DECLS + +#if defined __USE_EXTERN_INLINES || defined _FORCE_INLINES + +# if !defined (__EBUSY) || !defined (__EINVAL) +# include +# ifndef __EBUSY +# define __EBUSY EBUSY +# endif +# ifndef __EINVAL +# define __EINVAL EINVAL +# endif +# endif + +# ifndef __PT_SPIN_INLINE +# define __PT_SPIN_INLINE __extern_inline +# endif + +__PT_SPIN_INLINE int __pthread_spin_destroy (__pthread_spinlock_t *__lock); + +__PT_SPIN_INLINE int +__pthread_spin_destroy (__pthread_spinlock_t *__lock) +{ + return 0; +} + +__PT_SPIN_INLINE int __pthread_spin_init (__pthread_spinlock_t *__lock, + int __pshared); + +__PT_SPIN_INLINE int +__pthread_spin_init (__pthread_spinlock_t *__lock, int __pshared) +{ + *__lock = __SPIN_LOCK_INITIALIZER; + return 0; +} + +__PT_SPIN_INLINE int __pthread_spin_trylock (__pthread_spinlock_t *__lock); + +__PT_SPIN_INLINE int +__pthread_spin_trylock (__pthread_spinlock_t *__lock) +{ + int __locked = __sync_val_compare_and_swap (__lock, 0, 1); + return __locked ? __EBUSY : 0; +} + +__extern_inline int __pthread_spin_lock (__pthread_spinlock_t *__lock); +extern int _pthread_spin_lock (__pthread_spinlock_t *__lock); + +__extern_inline int +__pthread_spin_lock (__pthread_spinlock_t *__lock) +{ + if (__pthread_spin_trylock (__lock)) + return _pthread_spin_lock (__lock); + return 0; +} + +__PT_SPIN_INLINE int __pthread_spin_unlock (__pthread_spinlock_t *__lock); + +__PT_SPIN_INLINE int +__pthread_spin_unlock (__pthread_spinlock_t *__lock) +{ + int __locked = __sync_val_compare_and_swap (__lock, 1, 0); + return __locked ? 0 : __EINVAL; +} + +#endif /* Use extern inlines or force inlines. */ + +__END_DECLS + +#endif /* bits/spin-lock.h */ -- cgit v1.2.3