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bitmap: Make bitmap_scan() able to scan for 0-bits or 1-bits.

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Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2014-03-23 23:00:17 -07:00
parent 9c4dbc1caa
commit b71273f60d
5 changed files with 17 additions and 14 deletions
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9
lib/bitmap.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -100,11 +100,12 @@ bitmap_set(unsigned long *bitmap, size_t offset, bool value)
void bitmap_set_multiple(unsigned long *, size_t start, size_t count,
bool value);
bool bitmap_equal(const unsigned long *, const unsigned long *, size_t n);
size_t bitmap_scan(const unsigned long int *, size_t start, size_t end);
size_t bitmap_scan(const unsigned long int *, bool target,
size_t start, size_t end);
size_t bitmap_count1(const unsigned long *, size_t n);
#define BITMAP_FOR_EACH_1(IDX, SIZE, BITMAP) \
for ((IDX) = bitmap_scan(BITMAP, 0, SIZE); (IDX) < (SIZE); \
(IDX) = bitmap_scan(BITMAP, (IDX) + 1, SIZE))
for ((IDX) = bitmap_scan(BITMAP, 1, 0, SIZE); (IDX) < (SIZE); \
(IDX) = bitmap_scan(BITMAP, 1, (IDX) + 1, SIZE))
#endif /* bitmap.h */