Erlang: what is this process identifier in the form of {from, Pid, Ref}? -


i facing problem. when check erl_crash.dump, found stuff below: 

=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>}**, ...]

there {from, pid, ref} in link list of proc <0.19275.17>. have no idea these weird formed processes identifier are. guess maybe related "process monitoring". right? , still want know how can generate such process identifier , how can make use of them ?

thank in advance :)

this means process monitored other processes. documentation:

if process monitoring used, field tells in direction monitoring in effect, i.e., link being "to" process tells "current" process monitoring other , link "from" process tells other process monitoring current one.

you can find more infromation here


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