/usr/lib/ruby/vendor_ruby/rspec/support/mutex.rb is in ruby-rspec-support 3.5.0c3e0m0s0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Support
# On 1.8.7, it's in the stdlib.
# We don't want to load the stdlib, b/c this is a test tool, and can affect
# the test environment, causing tests to pass where they should fail.
#
# So we're transcribing/modifying it from
# https://github.com/ruby/ruby/blob/v1_8_7_374/lib/thread.rb#L56
# Some methods we don't need are deleted. Anything I don't
# understand (there's quite a bit, actually) is left in.
#
# Some formating changes are made to appease the robot overlord:
# https://travis-ci.org/rspec/rspec-core/jobs/54410874
# @private
class Mutex
def initialize
@waiting = []
@locked = false
@waiting.taint
taint
end
# @private
def lock
while Thread.critical = true && @locked
@waiting.push Thread.current
Thread.stop
end
@locked = true
Thread.critical = false
self
end
# @private
def unlock
return unless @locked
Thread.critical = true
@locked = false
wakeup_and_run_waiting_thread
self
end
# @private
def synchronize
lock
begin
yield
ensure
unlock
end
end
private
def wakeup_and_run_waiting_thread
begin
t = @waiting.shift
t.wakeup if t
rescue ThreadError
retry
end
Thread.critical = false
begin
t.run if t
rescue ThreadError
:noop
end
end
# Avoid warnings for library wide checks spec
end unless defined?(::RSpec::Support::Mutex) || defined?(::Mutex)
end
end
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