Class: ConditionVariable

Inherits:
Object show all
Defined in:
lib/phusion_passenger/utils.rb

Instance Method Summary collapse

Instance Method Details

#timed_wait(mutex, secs) ⇒ Object

This is like ConditionVariable.wait(), but allows one to wait a maximum amount of time. Returns true if this condition was signaled, false if a timeout occurred.



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# File 'lib/phusion_passenger/utils.rb', line 874

def timed_wait(mutex, secs)
	ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
	if secs > 100000000
		# NOTE: If one calls timeout() on FreeBSD 5 with an
		# argument of more than 100000000, then MRI will become
		# stuck in an infite loop, blocking all threads. It seems
		# that MRI uses select() to implement sleeping.
		# I think that a value of more than 100000000 overflows
		# select()'s data structures, causing it to behave incorrectly.
		# So we just make sure we can't sleep more than 100000000
		# seconds.
		secs = 100000000
	end
	if ruby_engine == "jruby"
		if secs > 0
			return wait(mutex, secs)
		else
			return wait(mutex)
		end
	elsif RUBY_VERSION >= '1.9.2'
		if secs > 0
			t1 = Time.now
			wait(mutex, secs)
			t2 = Time.now
			return t2.to_f - t1.to_f < secs
		else
			wait(mutex)
			return true
		end
	else
		if secs > 0
			Timeout.timeout(secs) do
				wait(mutex)
			end
		else
			wait(mutex)
		end
		return true
	end
rescue Timeout::Error
	return false
end

#timed_wait!(mutex, secs) ⇒ Object

This is like ConditionVariable.wait(), but allows one to wait a maximum amount of time. Raises Timeout::Error if the timeout has elapsed.



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# File 'lib/phusion_passenger/utils.rb', line 919

def timed_wait!(mutex, secs)
	ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
	if secs > 100000000
		# See the corresponding note for timed_wait().
		secs = 100000000
	end
	if ruby_engine == "jruby"
		if secs > 0
			if !wait(mutex, secs)
				raise Timeout::Error, "Timeout"
			end
		else
			wait(mutex)
		end
	elsif RUBY_VERSION >= '1.9.2'
		if secs > 0
			t1 = Time.now
			wait(mutex, secs)
			t2 = Time.now
			if t2.to_f - t1.to_f >= secs
				raise Timeout::Error, "Timeout"
			end
		else
			wait(mutex)
		end
	else
		if secs > 0
			Timeout.timeout(secs) do
				wait(mutex)
			end
		else
			wait(mutex)
		end
	end
	return nil
end