如果您想要真正可靠和准确的定期过程,您应该依靠实际的挂钟时间使用erlang:monotonic_time/0,1
。如果您使用方法层云3D's answer你最终会落后。
start_link(Period) when Period > 0, is_integer(Period) ->
gen_server:start_link({local, ?SERVER}, ?MODULE, Period, []).
...
init(Period) ->
StartT = erlang:monotonic_time(millisecond),
self() ! tick,
{ok, {StartT, Period}}.
...
handle_info(tick, {StartT, Period} = S) ->
Next = Period - (erlang:monotonic_time(millisecond)-StartT) rem Period,
_Timer = erlang:send_after(Next, self(), tick),
do_task(),
{noreply, S}.
您可以在 shell 中测试:
spawn(fun() ->
P = 1000,
StartT = erlang:monotonic_time(millisecond),
self() ! tick,
(fun F() ->
receive
tick ->
Next = P - (erlang:monotonic_time(millisecond)-StartT) rem P,
erlang:send_after(Next, self(), tick),
io:format("X~n", []),
F()
end
end)()
end).