c_extensions/c_mutexes_no_parens.rb

tests/_examples/c_extensions/c_mutexes_no_parens.rb in the metorex repository.

# A C extension making a Mutex, locking and unlocking it, sleeping on it,
# and running a C function while holding it.
require "tmpdir"
require_relative "build_helper"

directory = Dir.mktmpdir
require build_extension("c_mutexes.c", "c_mutexes", directory)
mutexes = CMutexes.new

mutex = mutexes.make
p mutex.class
p mutexes.locked mutex
p mutexes.try_lock mutex
p mutexes.try_lock mutex
report { mutexes.lock mutex }
p mutexes.unlock(mutex).equal? mutex
report { mutexes.unlock mutex }
p mutexes.lock(mutex).equal? mutex
p mutexes.sleep_on(mutex, 0).class
p mutexes.locked mutex
mutex.unlock
report { mutexes.sleep_on mutex, nil }

p mutexes.synchronize(mutex, -> { mutex.locked? })
report { mutexes.synchronize mutex, -> { raise ArgumentError, "stopped inside" } }
p mutex.locked?

FileUtils.rm_rf directory

Output:

Thread::Mutex
false
true
false
ThreadError: deadlock; recursive locking
true
ThreadError: Attempt to unlock a mutex which is not locked
true
Integer
true
ThreadError: Attempt to unlock a mutex which is not locked
true
ArgumentError: stopped inside
false