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1e68e43d3f
This new view, wrapped around a SRF, shows some information known about wait events, as of: - Name. - Type (Activity, I/O, Extension, etc.). - Description. All the information retrieved comes from wait_event_names.txt, and the description is the same as the documentation with filters applied to remove any XML markups. This view is useful when joined with pg_stat_activity to get the description of a wait event reported. Custom wait events for extensions are included in the view. Original idea by Yves Colin. Author: Bertrand Drouvot Reviewed-by: Kyotaro Horiguchi, Masahiro Ikeda, Tom Lane, Michael Paquier Discussion: https://postgr.es/m/0e2ae164-dc89-03c3-cf7f-de86378053ac@gmail.com
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*------------------------------------------------------------------------
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*
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* wait_event_funcs.c
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* Functions for accessing wait event data.
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/utils/activity/wait_event_funcs.c
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*
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*------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "funcapi.h"
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#include "utils/builtins.h"
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#include "utils/wait_event.h"
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/*
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* Each wait event has one corresponding entry in this structure, fed to
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* the SQL function of this file.
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*/
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static const struct
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{
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const char *type;
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const char *name;
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const char *description;
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}
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waitEventData[] =
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{
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#include "wait_event_funcs_data.c"
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/* end of list */
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{NULL, NULL, NULL}
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};
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/*
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* pg_get_wait_events
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*
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* List information about wait events (type, name and description).
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*/
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Datum
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pg_get_wait_events(PG_FUNCTION_ARGS)
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{
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#define PG_GET_WAIT_EVENTS_COLS 3
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
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char **waiteventnames;
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int nbextwaitevents;
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/* Build tuplestore to hold the result rows */
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InitMaterializedSRF(fcinfo, 0);
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/* Iterate over the list of wait events */
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for (int idx = 0; waitEventData[idx].type != NULL; idx++)
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{
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Datum values[PG_GET_WAIT_EVENTS_COLS] = {0};
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bool nulls[PG_GET_WAIT_EVENTS_COLS] = {0};
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values[0] = CStringGetTextDatum(waitEventData[idx].type);
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values[1] = CStringGetTextDatum(waitEventData[idx].name);
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values[2] = CStringGetTextDatum(waitEventData[idx].description);
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tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
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}
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/* Handle custom wait events for extensions */
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waiteventnames = GetWaitEventExtensionNames(&nbextwaitevents);
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for (int idx = 0; idx < nbextwaitevents; idx++)
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{
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StringInfoData buf;
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Datum values[PG_GET_WAIT_EVENTS_COLS] = {0};
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bool nulls[PG_GET_WAIT_EVENTS_COLS] = {0};
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values[0] = CStringGetTextDatum("Extension");
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values[1] = CStringGetTextDatum(waiteventnames[idx]);
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initStringInfo(&buf);
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appendStringInfo(&buf,
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"Waiting for custom wait event \"%s\" defined by extension module",
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waiteventnames[idx]);
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values[2] = CStringGetTextDatum(buf.data);
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tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
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}
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return (Datum) 0;
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}
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