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pid
Combined from primary sources listed below.

In Proc§

See primary documentation in context for method pid. 

method pid()

Returns the PID value of the process if available, or Nil.

In Proc::Async§

See primary documentation in context for method pid. 

method pid(Proc::Async:D: --> Promise:D)

Equivalent to ready.

Returns a Promise that will be kept once the process has successfully started. Promise will be broken if the program fails to start. Returned promise will hold the process id (PID).

Implementation-specific note: Available starting from Rakudo 2018.04.