Create urcu/arch_unknown.h and urcu/uatomic_arch_unknown.h, which contain only #error statements and explanatory comments. This forces build failures on unrecognized architectures in preference to trying to guess at what operations might be safe on such architectures.
One other semi-feasible alternative is to use hashed arrays of locks that are acquired with signals disabled. However, this seems a bit too ornate, especially for architectures for which the gcc __sync_ primitives work correctly. Signed-off-by: Paul E. McKenney <[email protected]> --- arch_unknown.h | 32 ++++++++++++++++++++++++++++++++ uatomic_arch_unknown.h | 29 +++++++++++++++++++++++++++++ 2 files changed, 61 insertions(+) diff --git a/urcu/arch_unknown.h b/urcu/arch_unknown.h new file mode 100644 index 0000000..91395ff --- /dev/null +++ b/urcu/arch_unknown.h @@ -0,0 +1,32 @@ +#ifndef _URCU_ARCH_UNKNOWN_H +#define _URCU_ARCH_UNKNOWN_H + +/* + * arch_unknown.h: #error to prevent build on unknown architectures. + * + * Copyright (c) 2010 Paul E. McKenney, IBM Corporation. + * Copyright (c) 2009 Mathieu Desnoyers <[email protected]> + * + * 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 + */ + +/* + * See configure.ac for the list of recognized architectures. + * Alternatively, "ls arch_*.h" in this directory, ignoring + * this "arch_unknown.h" file. + */ +#error "Cannot build: unrecognized architecture detected." + +#endif /* _URCU_ARCH_UNKNOWN_H */ diff --git a/urcu/uatomic_arch_unknown.h b/urcu/uatomic_arch_unknown.h new file mode 100644 index 0000000..d104fe1 --- /dev/null +++ b/urcu/uatomic_arch_unknown.h @@ -0,0 +1,29 @@ +#ifndef _URCU_ARCH_UATOMIC_UNKNOWN_H +#define _URCU_ARCH_UATOMIC_UNKNOWN_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. + */ + +/* + * See configure.ac for the list of recognized architectures. + * Alternatively, "ls uatomic_arch_*.h" in this directory, ignoring + * this "uatomic_arch_unknown.h" file. + */ +#error "Cannot build: unrecognized architecture detected." + +#endif /* _URCU_ARCH_UATOMIC_UNKNOWN_H */ _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
