如何确定进程父级的PID-HowDoYouDetermineThePIDoftheParentofaProcess

14  

You should pass self() to the child as one of the arguments to the entry function.

您应该将self()作为entry函数的参数之一传递给子节点。

spawn_link(?MODULE, child, [self()]).

4  

@Eridius' answer is the preferred way to do it. Requiring a process to register a name may have unintended side-effects such as increasing the visibility of the process not to mention the hassle of coming up with unique names when you have lots of processes.

@Eridius的回答是首选的方法。要求进程注册名称可能会产生意想不到的副作用,例如提高进程的可见性,更不用说在有大量进程时提出独特名称的麻烦。

3  

The best way is definitely to pass it as an argument to the function called to start the child process. If you are spawning funs, which generally is a Good Thing to do, be careful of doing:

最好的方法是将它作为参数传递给被调用以启动子进程的函数。如果你正在产生乐趣,这通常是一件好事,小心做:

spawn_link(fun () -> child(self()) end)

which will NOT do as you intended. (Hint: when is self() called)

这不会像你想象的那样做。 (提示:何时调用self())

Generally you should avoid registering a process, i.e. giving it a global name, unless you really want it to be globally known. Spawning a fun means that you don't have to export the spawned function as you should generally avoid exporting functions that aren't meant to be called from other modules.

一般来说,你应该避免注册一个进程,即给它一个全局名称,除非你真的希望它是全局知道的。产生乐趣意味着您不必导出衍生函数,因为您通常应该避免导出不打算从其他模块调用的函数。

0  

You can use the BIF register to give the spawning / parent process a name (an atom) then refer back to the registered name from other processes.

您可以使用BIF寄存器为产卵/父进程提供名称(原子),然后返回其他进程的注册名称。

FUNC() ->

%% Do something
%% Then send message to parent
parent ! MESSAGE.

%%做一些%%然后向父母发送消息!信息。

...

register(parent, self()),
spawn(MODULE, FUNC, [ARGS]).

寄存器(parent,self()),spawn(MODULE,FUNC,[ARGS])。

See Getting Started With Erlang §3.3 and The Erlang Reference Manual §10.3.

请参阅Erlang§3.3入门和Erlang参考手册§10.3。