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| author | Ryan Libby <rlibby@FreeBSD.org> | 2020-12-31 21:02:45 +0000 |
|---|---|---|
| committer | Ryan Libby <rlibby@FreeBSD.org> | 2020-12-31 21:02:45 +0000 |
| commit | ae4a8e52072a87bfd49d553b9b14450c626269f8 (patch) | |
| tree | baf46a9e617360c2047603595802d8655bf2b7f8 /sys | |
| parent | 1e54857bd9f5791ec1edfc5c21edb374519e9061 (diff) | |
| download | src-ae4a8e52072a87bfd49d553b9b14450c626269f8.tar.gz src-ae4a8e52072a87bfd49d553b9b14450c626269f8.zip | |
bitset: implement BIT_TEST_CLR_ATOMIC & BIT_TEST_SET_ATOMIC
That is, provide wrappers around the atomic_testandclear and
atomic_testandset primitives.
Submitted by: jeff
Reviewed by: cem, kib, markj
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D22702
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/sys/bitset.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sys/sys/bitset.h b/sys/sys/bitset.h index 97f18def7236..2b5df78a8193 100644 --- a/sys/sys/bitset.h +++ b/sys/sys/bitset.h @@ -173,6 +173,12 @@ (d)->__bits[__i] = (s1)->__bits[__i] ^ (s2)->__bits[__i];\ } while (0) +/* + * Note, the atomic(9) API is not consistent between clear/set and + * testandclear/testandset in whether the value argument is a mask + * or a bit index. + */ + #define BIT_CLR_ATOMIC(_s, n, p) \ atomic_clear_long(&(p)->__bits[__bitset_word(_s, n)], \ __bitset_mask((_s), n)) @@ -185,6 +191,14 @@ atomic_set_acq_long(&(p)->__bits[__bitset_word(_s, n)], \ __bitset_mask((_s), n)) +#define BIT_TEST_CLR_ATOMIC(_s, n, p) \ + (atomic_testandclear_long( \ + &(p)->__bits[__bitset_word((_s), (n))], (n)) != 0) + +#define BIT_TEST_SET_ATOMIC(_s, n, p) \ + (atomic_testandset_long( \ + &(p)->__bits[__bitset_word((_s), (n))], (n)) != 0) + /* Convenience functions catering special cases. */ #define BIT_AND_ATOMIC(_s, d, s) do { \ __size_t __i; \ |