test_shm_mq.h

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/*--------------------------------------------------------------------------
 *
 * test_shm_mq.h
 *      Definitions for shared memory message queues
 *
 * Copyright (c) 2013-2025, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *      src/test/modules/test_shm_mq/test_shm_mq.h
 *
 * -------------------------------------------------------------------------
 */
 
#ifndef TEST_SHM_MQ_H
#define TEST_SHM_MQ_H
 
#include "storage/dsm.h"
#include "storage/shm_mq.h"
#include "storage/spin.h"
 
/* Identifier for shared memory segments used by this extension. */
#define     PG_TEST_SHM_MQ_MAGIC        0x79fb2447
 
/*
 * This structure is stored in the dynamic shared memory segment.  We use
 * it to determine whether all workers started up OK and successfully
 * attached to their respective shared message queues.
 */
typedef struct
{
    slock_t     mutex;
    int         workers_total;
    int         workers_attached;
    int         workers_ready;
} test_shm_mq_header;
 
/* Set up dynamic shared memory and background workers for test run. */
extern void test_shm_mq_setup(int64 queue_size, int32 nworkers,
                              dsm_segment **segp, shm_mq_handle **output,
                              shm_mq_handle **input);
 
/* Main entrypoint for a worker. */
extern PGDLLEXPORT void test_shm_mq_main(Datum) pg_attribute_noreturn();
 
#endif