zend_bool s_lock_session()

in php_memcached_session.c [123:164]

• 34 lines of code
• 7 McCabe index (conditional complexity)

zend_bool s_lock_session(memcached_st *memc, zend_string *sid)
{
	memcached_return rc;
	char *lock_key;
	size_t lock_key_len;
	time_t expiration;
	zend_long wait_time, retries;
	php_memcached_user_data *user_data = memcached_get_user_data(memc);

	lock_key_len = spprintf(&lock_key, 0, "lock.%s", sid->val);
	expiration   = s_lock_expiration();

	wait_time = MEMC_SESS_INI(lock_wait_min);
	retries   = MEMC_SESS_INI(lock_retries);

	do {
		rc = memcached_add(memc, lock_key, lock_key_len, "1", sizeof ("1") - 1, expiration, 0);

		switch (rc) {

			case MEMCACHED_SUCCESS:
				user_data->lock_key  = zend_string_init(lock_key, lock_key_len, user_data->is_persistent);
				user_data->is_locked = 1;
			break;

			case MEMCACHED_NOTSTORED:
			case MEMCACHED_DATA_EXISTS:
				if (retries > 0) {
					usleep(wait_time * 1000);
					wait_time = MIN(MEMC_SESS_INI(lock_wait_max), wait_time * 2);
				}
			break;

			default:
				php_error_docref(NULL, E_WARNING, "Failed to write session lock: %s", memcached_strerror (memc, rc));
				break;
		}
	} while (!user_data->is_locked && retries-- > 0);

	efree(lock_key);
	return user_data->is_locked;
}