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-rw-r--r--test/thread/test_cv.rb188
1 files changed, 188 insertions, 0 deletions
diff --git a/test/thread/test_cv.rb b/test/thread/test_cv.rb
new file mode 100644
index 00000000000..eeec3b3ea53
--- /dev/null
+++ b/test/thread/test_cv.rb
@@ -0,0 +1,188 @@
+require 'test/unit'
+require 'thread'
+require 'tmpdir'
+require_relative '../ruby/envutil'
+
+class TestConditionVariable < Test::Unit::TestCase
+ 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
+ nr_threads.times do |i|
+ threads[i].join
+ end
+
+ assert_equal ["C1", "C1", "C1", "P1", "P2", "C2", "C2", "C2"], result
+ end
+
+ def test_condvar_wait_deadlock
+ assert_in_out_err([], <<-INPUT, ["No live threads left. Deadlock?"], [])
+ require "thread"
+
+ mutex = Mutex.new
+ cv = ConditionVariable.new
+
+ mesg = nil
+ begin
+ mutex.lock
+ cv.wait mutex
+ mutex.unlock
+ rescue Exception => e
+ mesg = e.message
+ end
+ 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
+end