Erlang:{from, Pid, Ref}形式的这个进程标识符是什么？

Question

我现在面临一个问题。当我检查 erl_crash.dump 时，我发现了一些如下内容:

=proc:<0.19275.17>  
State: Scheduled  
Spawned as: proc_lib:init_p/5  
Spawned by: <0.18723.17>  
Started: Wed May 8 13:30:40 2013  
Message queue length: 1  
Number of heap fragments: 0  
Heap fragment data: 0  
Link list: [<0.20051.17>, <0.9976.18>, ..., **{from,<6524.13.0>,#Ref<6524.0.1.37040>}, {from,<6474.13.0>,#Ref<6474.0.1.36682>}, {from,<6470.13.0>,#Ref<6470.0.1.34219>}**, ...]

有类似 {来自，Pid，引用} 在 proc <0.19275.17> 的链接列表中。
我不知道这些奇怪的形成过程标识符是什么。我想这可能与“进程监控”有关。我对吗？我仍然想知道如何生成这样的进程标识符以及如何使用它们？

先感谢您 :)

Answer 1

这意味着该进程被其他进程监视。从文档:

If process monitoring is used, this field also tells in which direction the monitoring is in effect, i.e., a link being "to" a process tells you that the "current" process was monitoring the other and a link "from" a process tells you that the other process was monitoring the current one.

您可以找到更多信息 here