From a687d4c7f843938cce99a772807f606e51b3aaed Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Mon, 14 Jan 2019 12:04:22 -0800 Subject: [PATCH v1 2/4] simplehash: Add support for resetting a hashtable's contents. Author: Reviewed-By: Discussion: https://postgr.es/m/ Backpatch: --- src/include/lib/simplehash.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/src/include/lib/simplehash.h b/src/include/lib/simplehash.h index 3b30c185cdf..d36f15d4a14 100644 --- a/src/include/lib/simplehash.h +++ b/src/include/lib/simplehash.h @@ -72,6 +72,7 @@ /* function declarations */ #define SH_CREATE SH_MAKE_NAME(create) #define SH_DESTROY SH_MAKE_NAME(destroy) +#define SH_RESET SH_MAKE_NAME(reset) #define SH_INSERT SH_MAKE_NAME(insert) #define SH_DELETE SH_MAKE_NAME(delete) #define SH_LOOKUP SH_MAKE_NAME(lookup) @@ -140,6 +141,7 @@ typedef struct SH_ITERATOR SH_SCOPE SH_TYPE *SH_CREATE(MemoryContext ctx, uint32 nelements, void *private_data); SH_SCOPE void SH_DESTROY(SH_TYPE * tb); +SH_SCOPE void SH_RESET(SH_TYPE * tb); SH_SCOPE void SH_GROW(SH_TYPE * tb, uint32 newsize); SH_SCOPE SH_ELEMENT_TYPE *SH_INSERT(SH_TYPE * tb, SH_KEY_TYPE key, bool *found); SH_SCOPE SH_ELEMENT_TYPE *SH_LOOKUP(SH_TYPE * tb, SH_KEY_TYPE key); @@ -368,6 +370,14 @@ SH_DESTROY(SH_TYPE * tb) pfree(tb); } +/* reset the contents of a previously created hash table */ +SH_SCOPE void +SH_RESET(SH_TYPE * tb) +{ + memset(tb->data, 0, sizeof(SH_ELEMENT_TYPE) * tb->size); + tb->members = 0; +} + /* * Grow a hash table to at least `newsize` buckets. * @@ -959,6 +969,7 @@ SH_STAT(SH_TYPE * tb) /* external function names */ #undef SH_CREATE #undef SH_DESTROY +#undef SH_RESET #undef SH_INSERT #undef SH_DELETE #undef SH_LOOKUP -- 2.18.0.rc2.dirty