greenplumn test_shm_mq 源码
greenplumn test_shm_mq 代码
文件路径：/src/test/modules/test_shm_mq/test_shm_mq.h
/*--------------------------------------------------------------------------
*
* test_shm_mq.h
* Definitions for shared memory message queues
*
* Copyright (c) 2013-2019, 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 **seg, shm_mq_handle **output,
shm_mq_handle **input);
/* Main entrypoint for a worker. */
extern void test_shm_mq_main(Datum) pg_attribute_noreturn();
#endif
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