Function reftable_stack_reload_maybe_reuse

reftable/stack.c:368–501

}

static int reftable_stack_reload_maybe_reuse(struct reftable_stack *st,
					     int reuse_open)
{
	char **names = NULL, **names_after = NULL;
	uint64_t deadline;
	int64_t delay = 0;
	int tries = 0, err;
	int fd = -1;

	deadline = reftable_time_ms() + 3000;

	while (1) {
		uint64_t now = reftable_time_ms();

		/*
		 * Only look at deadlines after the first few times. This
		 * simplifies debugging in GDB.
		 */
		tries++;
		if (tries > 3 && now >= deadline)
			goto out;

		fd = open(st->list_file, O_RDONLY);
		if (fd < 0) {
			if (errno != ENOENT) {
				err = REFTABLE_IO_ERROR;
				goto out;
			}

			REFTABLE_CALLOC_ARRAY(names, 1);
			if (!names) {
				err = REFTABLE_OUT_OF_MEMORY_ERROR;
				goto out;
			}
		} else {
			err = fd_read_lines(fd, &names);
			if (err < 0)
				goto out;
		}

		err = reftable_stack_reload_once(st, (const char **) names, reuse_open);
		if (!err)
			break;
		if (err != REFTABLE_NOT_EXIST_ERROR)
			goto out;

		/*
		 * REFTABLE_NOT_EXIST_ERROR can be caused by a concurrent
		 * writer. Check if there was one by checking if the name list
		 * changed.
		 */
		err = read_lines(st->list_file, &names_after);
		if (err < 0)
			goto out;
		if (names_equal((const char **) names_after,
				(const char **) names)) {
			err = REFTABLE_NOT_EXIST_ERROR;
			goto out;