Messages in this thread Patch in this message |  | | From | Hitoshi Mitake <> | | Subject | [PATCH 1/3] perf bench: Add wrappers for atomic operation of GCC | | Date | Tue, 24 Nov 2009 23:39:13 +0900 |
| |
This patch adds new file util/include/asm/atomic.h. It contains wrappers for atomic operation of GCC, I think this is useful not only for 'perf bench', but also for entire of perf command.
This patch adds new typedefed struct 'atomic_t'. I know new typedef is not a thing to welcome, but I believe that atomic_t is worth to typedef because it is much general.
I borrowed this file from Darren Hart's futextest. http://git.kernel.org/?p=linux/kernel/git/dvhart/futextest.git
Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> Cc: Michel Lespinasse <walken@google.com> Cc: Darren Hart <dvhltc@us.ibm.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> --- tools/perf/util/include/asm/atomic.h | 91 ++++++++++++++++++++++++++++++++++ 1 files changed, 91 insertions(+), 0 deletions(-) create mode 100644 tools/perf/util/include/asm/atomic.h
diff --git a/tools/perf/util/include/asm/atomic.h b/tools/perf/util/include/asm/atomic.h new file mode 100644 index 0000000..1cef451 --- /dev/null +++ b/tools/perf/util/include/asm/atomic.h @@ -0,0 +1,91 @@ +/****************************************************************************** + * + * Copyright © International Business Machines Corp., 2009 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * NAME + * atomic.h + * + * DESCRIPTION + * GCC atomic builtin wrappers + * http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html + * + * AUTHOR + * Darren Hart <dvhltc@us.ibm.com> + * + * HISTORY + * 2009-Nov-17: Initial version by Darren Hart <dvhltc@us.ibm.com> + * + *****************************************************************************/ + +#ifndef _PERF_ASM_ATOMIC_H +#define _PERF_ASM_ATOMIC_H + +typedef struct { + volatile int val; +} atomic_t; + +#define ATOMIC_INITIALIZER { 0 } + +/** + * atomic_cmpxchg() - Atomic compare and exchange + * @uaddr: The address of the futex to be modified + * @oldval: The expected value of the futex + * @newval: The new value to try and assign the futex + * + * Return the old value of addr->val. + */ +static inline int atomic_cmpxchg(atomic_t *addr, int oldval, int newval) +{ + return __sync_val_compare_and_swap(&addr->val, oldval, newval); +} + +/** + * atomic_inc() - Atomic incrememnt + * @addr: Address of the variable to increment + * + * Return the new value of addr->val. + */ +static inline int atomic_inc(atomic_t *addr) +{ + return __sync_add_and_fetch(&addr->val, 1); +} + +/** + * atomic_dec() - Atomic decrement + * @addr: Address of the variable to decrement + * + * Return the new value of addr-val. + */ +static inline int atomic_dec(atomic_t *addr) +{ + return __sync_sub_and_fetch(&addr->val, 1); +} + +/** + * atomic_set() - Atomic set + * @addr: Address of the variable to set + * @newval: New value for the atomic_t + * + * Return the new value of addr->val. + */ +static inline int atomic_set(atomic_t *addr, int newval) +{ + addr->val = newval; + return newval; +} + +#endif /* _PERF_ASM_ATOMIC_H */ -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |