Move bgworker specific logic to bgworker.c

For clarity, we've been slowly moving functions that are not called
from the postmaster process out of postmaster.c.

Author: Xing Guo <higuoxing@gmail.com>
Discussion: https://www.postgresql.org/message-id/CACpMh%2BDBHVT4xPGimzvex%3DwMdMLQEu9PYhT%2BkwwD2x2nu9dU_Q%40mail.gmail.com

src/backend/postmaster/bgworker.c

@@ -851,6 +851,89 @@ BackgroundWorkerMain(char *startup_data, size_t startup_data_len)
 	proc_exit(0);
 }
 
+/*
+ * Connect background worker to a database.
+ */
+void
+BackgroundWorkerInitializeConnection(const char *dbname, const char *username, uint32 flags)
+{
+	BackgroundWorker *worker = MyBgworkerEntry;
+	bits32		init_flags = 0; /* never honor session_preload_libraries */
+
+	/* ignore datallowconn? */
+	if (flags & BGWORKER_BYPASS_ALLOWCONN)
+		init_flags |= INIT_PG_OVERRIDE_ALLOW_CONNS;
+	/* ignore rolcanlogin? */
+	if (flags & BGWORKER_BYPASS_ROLELOGINCHECK)
+		init_flags |= INIT_PG_OVERRIDE_ROLE_LOGIN;
+
+	/* XXX is this the right errcode? */
+	if (!(worker->bgw_flags & BGWORKER_BACKEND_DATABASE_CONNECTION))
+		ereport(FATAL,
+				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
+				 errmsg("database connection requirement not indicated during registration")));
+
+	InitPostgres(dbname, InvalidOid,	/* database to connect to */
+				 username, InvalidOid,	/* role to connect as */
+				 init_flags,
+				 NULL);			/* no out_dbname */
+
+	/* it had better not gotten out of "init" mode yet */
+	if (!IsInitProcessingMode())
+		ereport(ERROR,
+				(errmsg("invalid processing mode in background worker")));
+	SetProcessingMode(NormalProcessing);
+}
+
+/*
+ * Connect background worker to a database using OIDs.
+ */
+void
+BackgroundWorkerInitializeConnectionByOid(Oid dboid, Oid useroid, uint32 flags)
+{
+	BackgroundWorker *worker = MyBgworkerEntry;
+	bits32		init_flags = 0; /* never honor session_preload_libraries */
+
+	/* ignore datallowconn? */
+	if (flags & BGWORKER_BYPASS_ALLOWCONN)
+		init_flags |= INIT_PG_OVERRIDE_ALLOW_CONNS;
+	/* ignore rolcanlogin? */
+	if (flags & BGWORKER_BYPASS_ROLELOGINCHECK)
+		init_flags |= INIT_PG_OVERRIDE_ROLE_LOGIN;
+
+	/* XXX is this the right errcode? */
+	if (!(worker->bgw_flags & BGWORKER_BACKEND_DATABASE_CONNECTION))
+		ereport(FATAL,
+				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
+				 errmsg("database connection requirement not indicated during registration")));
+
+	InitPostgres(NULL, dboid,	/* database to connect to */
+				 NULL, useroid, /* role to connect as */
+				 init_flags,
+				 NULL);			/* no out_dbname */
+
+	/* it had better not gotten out of "init" mode yet */
+	if (!IsInitProcessingMode())
+		ereport(ERROR,
+				(errmsg("invalid processing mode in background worker")));
+	SetProcessingMode(NormalProcessing);
+}
+
+/*
+ * Block/unblock signals in a background worker
+ */
+void
+BackgroundWorkerBlockSignals(void)
+{
+	sigprocmask(SIG_SETMASK, &BlockSig, NULL);
+}
+
+void
+BackgroundWorkerUnblockSignals(void)
+{
+	sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
+}
+
 /*
  * Register a new static background worker.
  *

src/backend/postmaster/postmaster.c

@@ -4148,89 +4148,6 @@ MaxLivePostmasterChildren(void)
 				max_wal_senders + max_worker_processes);
 }
 
-/*
- * Connect background worker to a database.
- */
-void
-BackgroundWorkerInitializeConnection(const char *dbname, const char *username, uint32 flags)
-{
-	BackgroundWorker *worker = MyBgworkerEntry;
-	bits32		init_flags = 0; /* never honor session_preload_libraries */
-
-	/* ignore datallowconn? */
-	if (flags & BGWORKER_BYPASS_ALLOWCONN)
-		init_flags |= INIT_PG_OVERRIDE_ALLOW_CONNS;
-	/* ignore rolcanlogin? */
-	if (flags & BGWORKER_BYPASS_ROLELOGINCHECK)
-		init_flags |= INIT_PG_OVERRIDE_ROLE_LOGIN;
-
-	/* XXX is this the right errcode? */
-	if (!(worker->bgw_flags & BGWORKER_BACKEND_DATABASE_CONNECTION))
-		ereport(FATAL,
-				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-				 errmsg("database connection requirement not indicated during registration")));
-
-	InitPostgres(dbname, InvalidOid,	/* database to connect to */
-				 username, InvalidOid,	/* role to connect as */
-				 init_flags,
-				 NULL);			/* no out_dbname */
-
-	/* it had better not gotten out of "init" mode yet */
-	if (!IsInitProcessingMode())
-		ereport(ERROR,
-				(errmsg("invalid processing mode in background worker")));
-	SetProcessingMode(NormalProcessing);
-}
-
-/*
- * Connect background worker to a database using OIDs.
- */
-void
-BackgroundWorkerInitializeConnectionByOid(Oid dboid, Oid useroid, uint32 flags)
-{
-	BackgroundWorker *worker = MyBgworkerEntry;
-	bits32		init_flags = 0; /* never honor session_preload_libraries */
-
-	/* ignore datallowconn? */
-	if (flags & BGWORKER_BYPASS_ALLOWCONN)
-		init_flags |= INIT_PG_OVERRIDE_ALLOW_CONNS;
-	/* ignore rolcanlogin? */
-	if (flags & BGWORKER_BYPASS_ROLELOGINCHECK)
-		init_flags |= INIT_PG_OVERRIDE_ROLE_LOGIN;
-
-	/* XXX is this the right errcode? */
-	if (!(worker->bgw_flags & BGWORKER_BACKEND_DATABASE_CONNECTION))
-		ereport(FATAL,
-				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-				 errmsg("database connection requirement not indicated during registration")));
-
-	InitPostgres(NULL, dboid,	/* database to connect to */
-				 NULL, useroid, /* role to connect as */
-				 init_flags,
-				 NULL);			/* no out_dbname */
-
-	/* it had better not gotten out of "init" mode yet */
-	if (!IsInitProcessingMode())
-		ereport(ERROR,
-				(errmsg("invalid processing mode in background worker")));
-	SetProcessingMode(NormalProcessing);
-}
-
-/*
- * Block/unblock signals in a background worker
- */
-void
-BackgroundWorkerBlockSignals(void)
-{
-	sigprocmask(SIG_SETMASK, &BlockSig, NULL);
-}
-
-void
-BackgroundWorkerUnblockSignals(void)
-{
-	sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
-}
-
 /*
  * Start a new bgworker.
  * Starting time conditions must have been checked already.