Import and compile code for article 6.5

1 files changed, 41 insertions, 0 deletions

diff --git a/sos-code-article6.5/sos/macros.h b/sos-code-article6.5/sos/macros.h
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+++ b/sos-code-article6.5/sos/macros.h
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+/* Copyright (C) 2004  The KOS Team
+
+   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. 
+*/
+#ifndef _SOS_MACROS_H_
+#define _SOS_MACROS_H_
+
+/** Align on a boundary (MUST be a power of 2), so that return value <= val */
+#define SOS_ALIGN_INF(val,boundary) \
+  (((unsigned)(val)) & (~((boundary)-1)))
+ 
+/** Align on a boundary (MUST be a power of 2), so that return value >= val */
+#define SOS_ALIGN_SUP(val,boundary) \
+  ({ unsigned int __bnd=(boundary); \
+     (((((unsigned)(val))-1) & (~(__bnd - 1))) + __bnd); })
+
+/** Check whether val is aligned on a boundary (MUST be a power of 2) */
+#define SOS_IS_ALIGNED(val,boundary) \
+  ( 0 == (((unsigned)(val)) & ((boundary)-1)) )
+
+/**
+ * @return TRUE if val is a power of 2.
+ * @note val is evaluated multiple times
+ */
+#define SOS_IS_POWER_OF_2(val) \
+  ((((val) - 1) & (val)) == 0)
+
+#endif /* _SOS_MACROS_H_ */