Often times, when invoking a function that spawns a process, the PID of the spawned process is returned and we bind to it. That PID is a reference to some BEAM process in our system.
We can create our own references using the
Let’s assume we have the following processes, among others, in our system at the moment.
> Process.list |> Enum.reverse |> Enum.take(3) [#PID<0.284.0>, #PID<0.283.0>, #PID<0.282.0>]
We can create a reference to any of them using the three number parts that they are made up of.
> pid(0, 284, 0) #PID<0.284.0>
See, it’s alive.
> pid(0, 284, 0) |> Process.alive? true
What if we make up a PID that doesn’t actually reference any process?
> pid(0, 333, 0) |> Process.alive? false
Note: there is also a
pid/1 version of the function. See
h pid for more