* test/ruby/test_thread.rb: move ConditionVariable related test

  into test/thread/test_cv.rb.
* test/thread/test_cv.rb: new file.
* test/thread/test_cv.rb (test_condvar_empty_signal): new tests.
* test/thread/test_cv.rb (test_condvar_empty_broadcast): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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 0000000000..eeec3b3ea5
--- /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