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# frozen_string_literal: true
module Dalli
##
# Dalli::PIDCache is a wrapper class for PID checking to avoid system calls when checking the PID.
##
module PIDCache
if !Process.respond_to?(:fork) # JRuby or TruffleRuby
@pid = Process.pid
singleton_class.attr_reader(:pid)
elsif Process.respond_to?(:_fork) # Ruby 3.1+
class << self
attr_reader :pid
def update!
@pid = Process.pid # rubocop:disable ThreadSafety/ClassInstanceVariable
end
end
update!
##
# Dalli::PIDCache::CoreExt hooks into Process to be able to reset the PID cache after fork
##
module CoreExt
def _fork
child_pid = super
PIDCache.update! if child_pid.zero?
child_pid
end
end
Process.singleton_class.prepend(CoreExt)
else # Ruby 3.0 or older
class << self
def pid
Process.pid
end
end
end
end
end
|
