有处理IO的组长协议的规范吗？ [英] Is there a specification of the group leader protocol that handles IO?

问题描述

$ b在Erlang中，每个进程都有一个组长，当一个进程想要打印某个东西（例如调用io库或做类似的事情）时，它会向组长发送一个消息。
$ b

我的问题是，在哪里可以找到这些消息的规格？或者一般来说，组长应该做什么的规范？

我设法找出一些实验，有时该进程发送一个 { io_request，Sender，GroupLeader，Request} 术语，答案是 {io_reply，GroupLeader，ok} 术语，但可能还有其他情况。

解决方案

Erlang理由（视频）或 （幻灯片）;是一个很好的信息来源，以及 user.erl 。

简而言之：

 code> {io_request，From，ReplyAs，Request} 
％From是发送回复的过程，
％ReplyAs是呼叫者期望的任何条款
％匹配请求和响应。 （回复中逐字回复）
 {io_reply，ReplyAs，Reply} 
  

user.erl：

  {put_chars，IoList}％将iolist 
 {put_chars，M，F，A} ％表示apply（M，F，A）
 {get_geometry，'rows'|的结果'columns'}％返回控制台的行或列数
 {get_line，Prompt}％调用io_lib：collect_line（Prompt）
 {get_chars，Prompt，Mod，Func，ExtraArgs} 
 {get_until，Prompt，Mod，Func，Args} 
 {setopts，选项}用户支持的％only选项是'binary'
％（如果存在于选项中，则为二进制模式，否则为列表模式）
  

In Erlang, every process has a group leader, and when a process wants to print something (i.e. it calls the io library or does something similar), it will send a message to its group leader.

My question is, where can I find the specification of these messages? Or in general, the specification of what a group leader should do?

I managed to find out with some experimenting that sometimes the process sends an {io_request, Sender, GroupLeader, Request} term, and the answer is an {io_reply, GroupLeader, ok} term, but there may be other cases.

解决方案

The Erlang Rationale (video) or (slides); is a good source of information, as is the source code for user.erl.

In short:

  {io_request, From, ReplyAs, Request}
  %From is the process to send the reply to, 
  %ReplyAs is any term the caller desires to 
  %match up the request and the response. (returned verbatim in the reply)
  {io_reply, ReplyAs, Reply}

Some requests in user.erl:

 {put_chars, IoList} % puts the iolist
 {put_chars, M,F,A} % puts the result of apply(M,F,A)
 {get_geometry, 'rows' | 'columns'} % returns the number of rows or columns of the console
 {get_line, Prompt} % calls io_lib:collect_line(Prompt)
 {get_chars, Prompt, Mod, Func, ExtraArgs} 
 {get_until, Prompt, Mod, Func, Args}
 {setopts, Options} % only option supported by user is 'binary' 
                    % (binary mode if present in Options, list mode otherwise)

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