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require 'test/unit'
require 'thread'
require 'tmpdir'
class TestConditionVariable < Test::Unit::TestCase
def test_initialized
assert_raise(TypeError) {
ConditionVariable.allocate.wait(nil)
}
end
def test_condvar_signal_and_wait
mutex = Mutex.new
condvar = ConditionVariable.new
result = []
mutex.synchronize do
t = Thread.new do
mutex.synchronize do
result << 1
condvar.signal
end
end
result << 0
condvar.wait(mutex)
result << 2
t.join
end
assert_equal([0, 1, 2], result)
end
def test_condvar_wait_exception_handling
# Calling wait in the only thread running should raise a ThreadError of
# 'stopping only thread'
mutex = Mutex.new
condvar = ConditionVariable.new
locked = false
thread = Thread.new do
Thread.current.abort_on_exception = false
mutex.synchronize do
begin
condvar.wait(mutex)
rescue Exception
locked = mutex.locked?
raise
end
end
end
until thread.stop?
sleep(0.1)
end
thread.raise Interrupt, "interrupt a dead condition variable"
assert_raise(Interrupt) { thread.value }
assert(locked)
end
def test_condvar_wait_and_broadcast
nr_threads = 3
threads = Array.new
mutex = Mutex.new
condvar = ConditionVariable.new
result = []
nr_threads.times do |i|
threads[i] = Thread.new do
mutex.synchronize do
result << "C1"
condvar.wait mutex
result << "C2"
end
end
end
sleep 0.1
mutex.synchronize do
result << "P1"
condvar.broadcast
result << "P2"
end
Timeout.timeout(5) do
nr_threads.times do |i|
threads[i].join
end
end
assert_equal ["C1", "C1", "C1", "P1", "P2", "C2", "C2", "C2"], result
end
def test_condvar_wait_deadlock
assert_in_out_err([], <<-INPUT, ["fatal", "No live threads left. Deadlock?"], [])
require "thread"
mutex = Mutex.new
cv = ConditionVariable.new
klass = nil
mesg = nil
begin
mutex.lock
cv.wait mutex
mutex.unlock
rescue Exception => e
klass = e.class
mesg = e.message
end
puts klass
print mesg
INPUT
end
def test_condvar_wait_deadlock_2
nr_threads = 3
threads = Array.new
mutex = Mutex.new
condvar = ConditionVariable.new
nr_threads.times do |i|
if (i != 0)
mutex.unlock
end
threads[i] = Thread.new do
mutex.synchronize do
condvar.wait mutex
end
end
mutex.lock
end
assert_raise(Timeout::Error) do
Timeout.timeout(0.1) { condvar.wait mutex }
end
mutex.unlock
threads.each(&:kill)
threads.each(&:join)
end
def test_condvar_timed_wait
mutex = Mutex.new
condvar = ConditionVariable.new
timeout = 0.3
locked = false
t0 = Time.now
mutex.synchronize do
begin
condvar.wait(mutex, timeout)
ensure
locked = mutex.locked?
end
end
t1 = Time.now
t = t1-t0
assert_operator(timeout*0.9, :<, t)
assert(locked)
end
def test_condvar_nolock
mutex = Mutex.new
condvar = ConditionVariable.new
assert_raise(ThreadError) {condvar.wait(mutex)}
end
def test_condvar_nolock_2
mutex = Mutex.new
condvar = ConditionVariable.new
Thread.new do
assert_raise(ThreadError) {condvar.wait(mutex)}
end.join
end
def test_condvar_nolock_3
mutex = Mutex.new
condvar = ConditionVariable.new
Thread.new do
assert_raise(ThreadError) {condvar.wait(mutex, 0.1)}
end.join
end
def test_condvar_empty_signal
mutex = Mutex.new
condvar = ConditionVariable.new
assert_nothing_raised(Exception) { mutex.synchronize {condvar.signal} }
end
def test_condvar_empty_broadcast
mutex = Mutex.new
condvar = ConditionVariable.new
assert_nothing_raised(Exception) { mutex.synchronize {condvar.broadcast} }
end
def test_dup
bug9440 = '[ruby-core:59961] [Bug #9440]'
condvar = ConditionVariable.new
assert_raise(NoMethodError, bug9440) do
condvar.dup
end
end
(DumpableCV = ConditionVariable.dup).class_eval {remove_method :marshal_dump}
def test_dump
bug9674 = '[ruby-core:61677] [Bug #9674]'
condvar = ConditionVariable.new
assert_raise_with_message(TypeError, /#{ConditionVariable}/, bug9674) do
Marshal.dump(condvar)
end
condvar = DumpableCV.new
assert_raise_with_message(TypeError, /internal Array/, bug9674) do
Marshal.dump(condvar)
end
end
end
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