Function InitPostgres

src/backend/utils/init/postinit.c:667–1497

-------------------------------- * InitPostgres * Initialize POSTGRES. * * The database can be specified by name, using the in_dbname parameter, or by * OID, using the dboid parameter. In the latter case, the actual database * name can be returned to the caller in out_dbname. If out_dbname isn't * NULL, it must point to a buffer of size NAMEDATALEN. * * Similarly, the username can be p

 * --------------------------------
 */
void
InitPostgres(const char *in_dbname, Oid dboid, const char *username,
			 Oid useroid, char *out_dbname, bool override_allow_connections)
{
	bool		bootstrap = IsBootstrapProcessingMode();
	bool		am_superuser;
	char	   *fullpath;
	char		dbname[NAMEDATALEN];

	elog(DEBUG3, "InitPostgres");

	/*
	 * Add my PGPROC struct to the ProcArray.
	 *
	 * Once I have done this, I am visible to other backends!
	 */
	InitProcessPhase2();

	/* Initialize SessionState entry */
	SessionState_Init();
	/* Initialize memory protection */
	GPMemoryProtect_Init();



	/*
	 * Initialize my entry in the shared-invalidation manager's array of
	 * per-backend data.
	 *
	 * Sets up MyBackendId, a unique backend identifier.
	 */
	MyBackendId = InvalidBackendId;

	SharedInvalBackendInit(false);

	if (MyBackendId > MaxBackends || MyBackendId <= 0)
		elog(FATAL, "bad backend ID: %d", MyBackendId);

	/* Now that we have a BackendId, we can participate in ProcSignal */
	ProcSignalInit(MyBackendId);

	/*
	 * Also set up timeout handlers needed for backend operation.  We need
	 * these in every case except bootstrap.
	 */
	if (!bootstrap)
	{
		RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
		RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
		RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
		RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
						IdleInTransactionSessionTimeoutHandler);
		RegisterTimeout(GANG_TIMEOUT, IdleGangTimeoutHandler);
		RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
		RegisterTimeout(GP_PARALLEL_RETRIEVE_CURSOR_CHECK_TIMEOUT, GpParallelRetrieveCursorCheckTimeoutHandler);
		RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
	}