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mdbx: добавление pnl_clone() и pnl_maxspan().

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev) 2024-12-20 21:36:29 +03:00
parent 781c04f6e2
commit 9568209ee4
2 changed files with 28 additions and 0 deletions
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22
src/pnl.c
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@ -23,6 +23,13 @@ void pnl_free(pnl_t pnl) {
osal_free(pnl - 1);
}
pnl_t pnl_clone(const pnl_t src) {
pnl_t pl = pnl_alloc(MDBX_PNL_ALLOCLEN(src));
if (likely(pl))
memcpy(pl, src, MDBX_PNL_SIZEOF(src));
return pl;
}
void pnl_shrink(pnl_t __restrict *__restrict ppnl) {
assert(pnl_bytes2size(pnl_size2bytes(MDBX_PNL_INITIAL)) >= MDBX_PNL_INITIAL &&
pnl_bytes2size(pnl_size2bytes(MDBX_PNL_INITIAL)) < MDBX_PNL_INITIAL * 3 / 2);
@ -234,3 +241,18 @@ __hot __noinline size_t pnl_search_nochk(const pnl_t pnl, pgno_t pgno) {
assert(!MDBX_PNL_ORDERED(it[0], pgno));
return it - begin + 1;
}
size_t pnl_maxspan(const pnl_t pnl) {
size_t len = MDBX_PNL_GETSIZE(pnl);
if (len > 1) {
size_t span = 1, left = len - span;
const pgno_t *scan = MDBX_PNL_BEGIN(pnl);
do {
const bool contiguous = MDBX_PNL_CONTIGUOUS(*scan, scan[span], span);
span += contiguous;
scan += 1 - contiguous;
} while (--left);
len = span;
}
return len;
}

6
src/pnl.h
View File

@ -45,10 +45,12 @@ typedef const pgno_t *const_pnl_t;
#define MDBX_PNL_EDGE(pl) ((pl) + 1)
#define MDBX_PNL_LEAST(pl) MDBX_PNL_FIRST(pl)
#define MDBX_PNL_MOST(pl) MDBX_PNL_LAST(pl)
#define MDBX_PNL_CONTIGUOUS(prev, next, span) ((next) - (prev)) == (span))
#else
#define MDBX_PNL_EDGE(pl) ((pl) + MDBX_PNL_GETSIZE(pl))
#define MDBX_PNL_LEAST(pl) MDBX_PNL_LAST(pl)
#define MDBX_PNL_MOST(pl) MDBX_PNL_FIRST(pl)
#define MDBX_PNL_CONTIGUOUS(prev, next, span) (((prev) - (next)) == (span))
#endif
#define MDBX_PNL_SIZEOF(pl) ((MDBX_PNL_GETSIZE(pl) + 1) * sizeof(pgno_t))
@ -83,6 +85,8 @@ MDBX_INTERNAL pnl_t pnl_alloc(size_t size);
MDBX_INTERNAL void pnl_free(pnl_t pnl);
MDBX_MAYBE_UNUSED MDBX_INTERNAL pnl_t pnl_clone(const pnl_t src);
MDBX_INTERNAL int pnl_reserve(pnl_t __restrict *__restrict ppnl, const size_t wanna);
MDBX_MAYBE_UNUSED static inline int __must_check_result pnl_need(pnl_t __restrict *__restrict ppnl, size_t num) {
@ -144,3 +148,5 @@ MDBX_MAYBE_UNUSED static inline size_t pnl_search(const pnl_t pnl, pgno_t pgno,
}
MDBX_INTERNAL size_t pnl_merge(pnl_t dst, const pnl_t src);
MDBX_MAYBE_UNUSED MDBX_NOTHROW_PURE_FUNCTION MDBX_INTERNAL size_t pnl_maxspan(const pnl_t pnl);