Concurrency Erlang:子进程正常执行,直到收到";死;?
我想知道是否有可能让子进程继续正常运行,直到它从父进程收到“die”消息 下面是子进程的代码Concurrency Erlang:子进程正常执行,直到收到";死;?,concurrency,erlang,Concurrency,Erlang,我想知道是否有可能让子进程继续正常运行,直到它从父进程收到“die”消息 下面是子进程的代码 -module(sensor). -export([start/1]). % must also export function that will be spawned %% create second thread, pass self() as argument so it knows how to reply %% exchange messages with second th
-module(sensor).
-export([start/1]). % must also export function that will be spawned
%% create second thread, pass self() as argument so it knows how to reply
%% exchange messages with second thread until sum=0
start(SlaveNr) ->
%this part is not right. It waits for die and does nothing else
receive
die ->
io:format("slave ~p: received die~n", [SlaveNr])
end,
random:seed(now()),
Measurement = random:uniform(11),
if Measurement == 11 ->
exit(crash);
true->
io:fwrite("slave ~p Random # ~p~n",[SlaveNr, Measurement])
end,
Sleep_time = random:uniform(10000),
timer:sleep(Sleep_time),
start(SlaveNr).
如您所见,它无法正常执行。它只是在等待,直到收到死亡信息。那么,我如何让它执行其正常功能,直到它从父进程收到指示所有子进程都应该退出的die?我知道您希望在每个循环中检查邮箱,您可以通过添加0毫秒的timout来实现这一点。因此,进程将检查收到的消息是否与die匹配,如果没有,它将立即继续
receive
die ->
io:format("slave ~p: received die~n", [SlaveNr])
after 0 ->
ok
end,
始终可以使用
exit/2
功能停止进程:exit(Pid,原因)
。在这种情况下,您不必在传感器模块中添加任何代码。如果您使用atomnormal
作为Reason
,进程将完全死亡,就像它自己正常死亡一样。这是完美的。非常感谢。