bitset: introduce helpers to allocate a bitset at runtime
Introduce some new helpers to declare and allocate a dynamic bitset, whose size is not a constant. Sponsored by: Citrix Systems R&D Reviewed by: kib jhb Differential revision: https://reviews.freebsd.org/D6226
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=299184
@ -47,4 +47,12 @@ struct t { \
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long __bits[__bitset_words((_s))]; \
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}
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/*
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* Helper to declare a bitset without it's size being a constant.
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*
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* Sadly we cannot declare a bitset struct with '__bits[]', because it's
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* the only member of the struct and the compiler complains.
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*/
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#define BITSET_DEFINE_VAR(t) BITSET_DEFINE(t, 1)
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#endif /* !_SYS__BITSET_H_ */
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@ -199,4 +199,10 @@
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#define BITSET_FSET(n) \
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[ 0 ... ((n) - 1) ] = (-1L)
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/*
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* Dynamically allocate a bitset.
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*/
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#define BITSET_ALLOC(_s, mt, mf) \
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malloc(__bitset_words(_s) * sizeof(long), mt, (mf))
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#endif /* !_SYS_BITSET_H_ */
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