From 9c9741004e1bf2a35d46ebf1e66bfbb5ec0e938d Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 18 Jun 2010 12:05:12 -0400 Subject: [PATCH] Add header files supporting gcc __sync_ primitives Add a urcu/arch_gcc.h and urcu/uatomic_arch_gcc.h whose primitives are based on the gcc __sync_ primitives. This should be usable for all systems that have correctly implemented __sync_ primitives, which sadly does not include all combinations of systems and compilers. In addition, specific systems may gain higher performance with hand-coded primitives. Nevertheless, this is nice for getting a new architecture up and running quickly. As suggested by Paolo Bonzini, defer the definition of mb() to the common arch_generic.h file, and also defer the uatomic*() primitives to uatomic_generic.h. [Mathieu : fixed arch_gcc.h header which contained incorrect arch_unknown.h in header.] Signed-off-by: Paul E. McKenney Signed-off-by: Mathieu Desnoyers --- urcu/arch_gcc.h | 54 +++++++++++++++++++++++++++++++++++++++++ urcu/uatomic_arch_gcc.h | 46 +++++++++++++++++++++++++++++++++++ 2 files changed, 100 insertions(+) create mode 100644 urcu/arch_gcc.h create mode 100644 urcu/uatomic_arch_gcc.h diff --git a/urcu/arch_gcc.h b/urcu/arch_gcc.h new file mode 100644 index 0000000..8e1a500 --- /dev/null +++ b/urcu/arch_gcc.h @@ -0,0 +1,54 @@ +#ifndef _URCU_ARCH_GCC_H +#define _URCU_ARCH_GCC_H + +/* + * arch_gcc.h: trivial definitions for architectures using gcc __sync_ + * + * Copyright (c) 2010 Paul E. McKenney, IBM Corporation. + * Copyright (c) 2009 Mathieu Desnoyers + * + * This 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. + * + * This 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +#include +#include + +typedef unsigned long long cycles_t; + +static inline cycles_t get_cycles (void) +{ + cycles_t thetime; + struct timeval tv; + + if (gettimeofday(&tv, NULL) != 0) + return 0; + thetime = ((cycles_t)tv.tv_sec) * 1000000ULL + ((cycles_t)tv.tv_usec); + return (cycles_t)thetime; +} + +#ifdef __cplusplus +} +#endif + +#include + +#endif /* _URCU_ARCH_GCC_H */ diff --git a/urcu/uatomic_arch_gcc.h b/urcu/uatomic_arch_gcc.h new file mode 100644 index 0000000..4aa32fd --- /dev/null +++ b/urcu/uatomic_arch_gcc.h @@ -0,0 +1,46 @@ +#ifndef _URCU_ARCH_UATOMIC_GCC_H +#define _URCU_ARCH_UATOMIC_GCC_H + +/* + * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. + * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. + * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P. + * Copyright (c) 2009 Mathieu Desnoyers + * Copyright (c) 2010 Paul E. McKenney, IBM Corporation + * (Adapted from uatomic_arch_ppc.h) + * + * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED + * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. + * + * Permission is hereby granted to use or copy this program + * for any purpose, provided the above notices are retained on all copies. + * Permission to modify the code and to distribute modified code is granted, + * provided the above notices are retained, and a notice that the code was + * modified is included with the above copyright notice. + * + * Code inspired from libuatomic_ops-1.2, inherited in part from the + * Boehm-Demers-Weiser conservative garbage collector. + */ + +#include +#include + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * If your platform doesn't have a full set of atomics, you will need + * a separate uatomic_arch_*.h file for your architecture. Otherwise, + * just rely on the definitions in uatomic_generic.h. + */ +#define UATOMIC_HAS_ATOMIC_BYTE +#define UATOMIC_HAS_ATOMIC_SHORT + +#ifdef __cplusplus +} +#endif + +#include + +#endif /* _URCU_ARCH_UATOMIC_GCC_H */ -- 2.34.1