test_multixact.c

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/*--------------------------------------------------------------------------
 *
 * test_multixact.c
 *      Support code for multixact testing
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *      src/test/modules/test_slru/test_multixact.c
 *
 * -------------------------------------------------------------------------
 */
 
#include "postgres.h"
 
#include "access/multixact.h"
#include "access/xact.h"
#include "fmgr.h"
#include "utils/injection_point.h"
 
PG_FUNCTION_INFO_V1(test_create_multixact);
PG_FUNCTION_INFO_V1(test_read_multixact);
 
/*
 * Produces multixact with 2 current xids
 */
Datum
test_create_multixact(PG_FUNCTION_ARGS)
{
    MultiXactId id;
 
    MultiXactIdSetOldestMember();
    id = MultiXactIdCreate(GetCurrentTransactionId(), MultiXactStatusUpdate,
                           GetCurrentTransactionId(), MultiXactStatusForShare);
    PG_RETURN_TRANSACTIONID(id);
}
 
/*
 * Reads given multixact after running an injection point. Discards local cache
 * to make a real read.  Tailored for multixact testing.
 */
Datum
test_read_multixact(PG_FUNCTION_ARGS)
{
    MultiXactId id = PG_GETARG_TRANSACTIONID(0);
    MultiXactMember *members;
 
    INJECTION_POINT("test-multixact-read");
    /* discard caches */
    AtEOXact_MultiXact();
 
    if (GetMultiXactIdMembers(id, &members, false, false) == -1)
        elog(ERROR, "MultiXactId not found");
 
    PG_RETURN_VOID();
}