diff options
| author | "Steven J. Hill" <sjhill@realitydiluted.com> | 2005-05-12 03:27:36 +0000 |
|---|---|---|
| committer | "Steven J. Hill" <sjhill@realitydiluted.com> | 2005-05-12 03:27:36 +0000 |
| commit | f122662e19bfb4d529d0b3d8f812bef44fb2d2f6 (patch) | |
| tree | 10fc9933b640ea05e237b3afc57d492d8c6c72fa /libc/sysdeps/linux/common | |
| parent | 03196f15d10064639691c25fb7ed0d2924ec8d5b (diff) | |
Added new 'bits/atomic.h' for most of the architectures and the top-level 'include/atomic.h' to add in new atomic operations for use by NPTL. There are multiple files for PowerPC and Sparc for 'atomic.h'. I will let those architecture maintainers choose the correct file. The files come from glibc in 'sysdeps/ARCH/bits'.
Diffstat (limited to 'libc/sysdeps/linux/common')
| -rw-r--r-- | libc/sysdeps/linux/common/bits/atomic.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/bits/atomic.h b/libc/sysdeps/linux/common/bits/atomic.h new file mode 100644 index 000000000..6245130a9 --- /dev/null +++ b/libc/sysdeps/linux/common/bits/atomic.h @@ -0,0 +1,43 @@ +/* Copyright (C) 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. + + 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. */ + +#ifndef _BITS_ATOMIC_H +#define _BITS_ATOMIC_H 1 + +/* We have by default no support for atomic operations. So define + them non-atomic. If this is a problem somebody will have to come + up with real definitions. */ + +/* The only basic operation needed is compare and exchange. */ +#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ __typeof (mem) __gmemp = (mem); \ + __typeof (*mem) __gret = *__gmemp; \ + __typeof (*mem) __gnewval = (newval); \ + \ + if (__gret == (oldval)) \ + *__gmemp = __gnewval; \ + __gret; }) + +#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ __typeof (mem) __gmemp = (mem); \ + __typeof (*mem) __gnewval = (newval); \ + \ + *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; }) + +#endif /* bits/atomic.h */ |