87 lines
2 KiB
Ruby
87 lines
2 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module ProcessManagement
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# Traps the given signals and yields the block whenever these signals are
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# received.
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#
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# The block is passed the name of the signal.
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#
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# Example:
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#
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# trap_signals(%i(HUP TERM)) do |signal|
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# ...
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# end
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def self.trap_signals(signals)
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signals.each do |signal|
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trap(signal) do
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yield signal
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end
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end
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end
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# Traps the given signals with the given command.
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#
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# Example:
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#
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# modify_signals(%i(HUP TERM), 'DEFAULT')
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def self.modify_signals(signals, command)
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signals.each { |signal| trap(signal, command) }
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end
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def self.signal(pid, signal)
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Process.kill(signal, pid)
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true
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rescue Errno::ESRCH
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false
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end
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def self.signal_processes(pids, signal)
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pids.each { |pid| signal(pid, signal) }
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end
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# Waits for the given process to complete using a separate thread.
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def self.wait_async(pid)
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Thread.new do
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Process.wait(pid)
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rescue StandardError
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nil # There is no reason to return `Errno::ECHILD` if it catches a `TypeError`
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end
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end
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# Returns true if all the processes are alive.
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def self.all_alive?(pids)
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pids.each do |pid|
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return false unless process_alive?(pid)
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end
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true
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end
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def self.any_alive?(pids)
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pids_alive(pids).any?
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end
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def self.pids_alive(pids)
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pids.select { |pid| process_alive?(pid) }
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end
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def self.process_alive?(pid)
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return false if pid.nil?
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# Signal 0 tests whether the process exists and we have access to send signals
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# but is otherwise a noop (doesn't actually send a signal to the process)
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signal(pid, 0)
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end
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def self.process_died?(pid)
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!process_alive?(pid)
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end
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def self.write_pid(path)
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File.open(path, 'w') do |handle|
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handle.write(Process.pid.to_s)
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end
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end
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end
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end
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