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Commit2eff9e6

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Add helper routines to retrieve data for custom fixed-numbered pgstats
This is useful for extensions to get snapshot and shmem data for customcumulative statistics when these have a fixed number of objects, so asthese do not need to know about the snapshot internals, aka pgStatLocal.An upcoming commit introducing an example template for custom cumulativestats with fixed-numbered objects will make use of these. I havenoticed that this is useful for extension developers while hacking myown example, actually.Author: Michael PaquierReviewed-by: Dmitry Dolgov, Bertrand DrouvotDiscussion:https://postgr.es/m/Zmqm9j5EO0I4W8dx@paquier.xyz
1 parent8036d73 commit2eff9e6

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‎src/include/utils/pgstat_internal.h

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@@ -525,6 +525,8 @@ static inline int pgstat_cmp_hash_key(const void *a, const void *b, size_t size,
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staticinlineuint32pgstat_hash_hash_key(constvoid*d,size_tsize,void*arg);
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staticinlinesize_tpgstat_get_entry_len(PgStat_Kindkind);
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staticinlinevoid*pgstat_get_entry_data(PgStat_Kindkind,PgStatShared_Common*entry);
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staticinlinevoid*pgstat_get_custom_shmem_data(PgStat_Kindkind);
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staticinlinevoid*pgstat_get_custom_snapshot_data(PgStat_Kindkind);
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/*
@@ -842,4 +844,34 @@ pgstat_get_entry_data(PgStat_Kind kind, PgStatShared_Common *entry)
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return ((char*) (entry))+off;
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}
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/*
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* Returns a pointer to the shared memory area of custom stats for
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* fixed-numbered statistics.
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*/
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staticinlinevoid*
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pgstat_get_custom_shmem_data(PgStat_Kindkind)
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{
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intidx=kind-PGSTAT_KIND_CUSTOM_MIN;
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Assert(pgstat_is_kind_custom(kind));
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Assert(pgstat_get_kind_info(kind)->fixed_amount);
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returnpgStatLocal.shmem->custom_data[idx];
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}
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/*
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* Returns a pointer to the portion of custom data for fixed-numbered
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* statistics in the current snapshot.
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*/
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staticinlinevoid*
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pgstat_get_custom_snapshot_data(PgStat_Kindkind)
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{
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intidx=kind-PGSTAT_KIND_CUSTOM_MIN;
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Assert(pgstat_is_kind_custom(kind));
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Assert(pgstat_get_kind_info(kind)->fixed_amount);
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returnpgStatLocal.snapshot.custom_data[idx];
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}
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#endif/* PGSTAT_INTERNAL_H */

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