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/*------------------------------------------------------------------------
*
* wait_event_funcs.c
* Functions for accessing wait event data.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/activity/wait_event_funcs.c
*
*------------------------------------------------------------------------
*/
#include "postgres.h"
#include "funcapi.h"
#include "utils/builtins.h"
#include "utils/wait_event.h"
/*
* Each wait event has one corresponding entry in this structure, fed to
* the SQL function of this file.
*/
static const struct
{
const char *type;
const char *name;
const char *description;
}
waitEventData[] =
{
#include "wait_event_funcs_data.c"
/* end of list */
{NULL, NULL, NULL}
};
/*
* pg_get_wait_events
*
* List information about wait events (type, name and description).
*/
Datum
pg_get_wait_events(PG_FUNCTION_ARGS)
{
#define PG_GET_WAIT_EVENTS_COLS 3
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
char **waiteventnames;
int nbwaitevents;
/* Build tuplestore to hold the result rows */
InitMaterializedSRF(fcinfo, 0);
/* Iterate over the list of wait events */
for (int idx = 0; waitEventData[idx].type != NULL; idx++)
{
Datum values[PG_GET_WAIT_EVENTS_COLS] = {0};
bool nulls[PG_GET_WAIT_EVENTS_COLS] = {0};
values[0] = CStringGetTextDatum(waitEventData[idx].type);
values[1] = CStringGetTextDatum(waitEventData[idx].name);
values[2] = CStringGetTextDatum(waitEventData[idx].description);
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
}
/* Handle custom wait events for extensions */
waiteventnames = GetWaitEventCustomNames(PG_WAIT_EXTENSION,
&nbwaitevents);
for (int idx = 0; idx < nbwaitevents; idx++)
{
StringInfoData buf;
Datum values[PG_GET_WAIT_EVENTS_COLS] = {0};
bool nulls[PG_GET_WAIT_EVENTS_COLS] = {0};
values[0] = CStringGetTextDatum("Extension");
values[1] = CStringGetTextDatum(waiteventnames[idx]);
initStringInfo(&buf);
appendStringInfo(&buf,
"Waiting for custom wait event \"%s\" defined by extension module",
waiteventnames[idx]);
values[2] = CStringGetTextDatum(buf.data);
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
}
/* Likewise for injection points */
waiteventnames = GetWaitEventCustomNames(PG_WAIT_INJECTIONPOINT,
&nbwaitevents);
for (int idx = 0; idx < nbwaitevents; idx++)
{
StringInfoData buf;
Datum values[PG_GET_WAIT_EVENTS_COLS] = {0};
bool nulls[PG_GET_WAIT_EVENTS_COLS] = {0};
values[0] = CStringGetTextDatum("InjectionPoint");
values[1] = CStringGetTextDatum(waiteventnames[idx]);
initStringInfo(&buf);
appendStringInfo(&buf,
"Waiting for injection point \"%s\"",
waiteventnames[idx]);
values[2] = CStringGetTextDatum(buf.data);
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
}
return (Datum) 0;
}
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