[Issue #281] Non-exclusive locking mode for read-only tasks, such as restore and validate

Author: gsmolk

src/backup.c

@@ -765,7 +765,7 @@ do_backup(time_t start_time, pgSetBackupParams *set_backup_params,
 	/* Create backup directory and BACKUP_CONTROL_FILE */
 	if (pgBackupCreateDir(&current))
 		elog(ERROR, "Cannot create backup directory");
-	if (!lock_backup(&current, true))
+	if (!lock_backup(&current, true, true))
 		elog(ERROR, "Cannot lock backup %s directory",
 			 base36enc(current.start_time));
 	write_backup(&current, true);