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Make some minor improvements in memory-context infrastructure.

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We lack a version of repalloc() that supports MCXT_ALLOC_NO_OOM
semantics, so invent repalloc_extended() with the usual set of
flags.  repalloc_huge() becomes a legacy wrapper for that.

Also, fix dynahash.c so that it can support HASH_ENTER_NULL
requests when using the default palloc-based allocator.
The only reason it didn't do that already was the lack of the
MCXT_ALLOC_NO_OOM option when that code was written, ages ago.

While here, simplify a few overcomplicated tests in mcxt.c.

Discussion: https://postgr.es/m/2982579.1662416866@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-10-14 11:55:56 -04:00
parent 1b11561cc1
commit 9c911ec065
3 changed files with 56 additions and 42 deletions
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2
src/include/utils/palloc.h
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@@ -78,6 +78,8 @@ extern void *palloc(Size size);
extern void *palloc0(Size size);
extern void *palloc_extended(Size size, int flags);
extern pg_nodiscard void *repalloc(void *pointer, Size size);
extern pg_nodiscard void *repalloc_extended(void *pointer,
Size size, int flags);
extern void pfree(void *pointer);
/*