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Diffstat (limited to 'spec/ruby/core/conditionvariable/wait_spec.rb')
-rw-r--r-- | spec/ruby/core/conditionvariable/wait_spec.rb | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/spec/ruby/core/conditionvariable/wait_spec.rb b/spec/ruby/core/conditionvariable/wait_spec.rb new file mode 100644 index 0000000000..fe73e513c0 --- /dev/null +++ b/spec/ruby/core/conditionvariable/wait_spec.rb @@ -0,0 +1,174 @@ +require_relative '../../spec_helper' + +describe "ConditionVariable#wait" do + it "calls #sleep on the given object" do + o = Object.new + o.should_receive(:sleep).with(1234) + + cv = ConditionVariable.new + + cv.wait(o, 1234) + end + + it "can be woken up by ConditionVariable#signal" do + m = Mutex.new + cv = ConditionVariable.new + in_synchronize = false + + th = Thread.new do + m.synchronize do + in_synchronize = true + cv.wait(m) + end + :success + end + + # wait for m to acquire the mutex + Thread.pass until in_synchronize + # wait until th is sleeping (ie waiting) + Thread.pass until th.stop? + + m.synchronize { cv.signal } + th.value.should == :success + end + + it "can be interrupted by Thread#run" do + m = Mutex.new + cv = ConditionVariable.new + in_synchronize = false + + th = Thread.new do + m.synchronize do + in_synchronize = true + cv.wait(m) + end + :success + end + + # wait for m to acquire the mutex + Thread.pass until in_synchronize + # wait until th is sleeping (ie waiting) + Thread.pass until th.stop? + + th.run + th.value.should == :success + end + + it "can be interrupted by Thread#wakeup" do + m = Mutex.new + cv = ConditionVariable.new + in_synchronize = false + + th = Thread.new do + m.synchronize do + in_synchronize = true + cv.wait(m) + end + :success + end + + # wait for m to acquire the mutex + Thread.pass until in_synchronize + # wait until th is sleeping (ie waiting) + Thread.pass until th.stop? + + th.wakeup + th.value.should == :success + end + + it "reacquires the lock even if the thread is killed" do + m = Mutex.new + cv = ConditionVariable.new + in_synchronize = false + owned = nil + + th = Thread.new do + m.synchronize do + in_synchronize = true + begin + cv.wait(m) + ensure + owned = m.owned? + $stderr.puts "\nThe Thread doesn't own the Mutex!" unless owned + end + end + end + + # wait for m to acquire the mutex + Thread.pass until in_synchronize + # wait until th is sleeping (ie waiting) + Thread.pass until th.stop? + + th.kill + th.join + + owned.should == true + end + + it "reacquires the lock even if the thread is killed after being signaled" do + m = Mutex.new + cv = ConditionVariable.new + in_synchronize = false + owned = nil + + th = Thread.new do + m.synchronize do + in_synchronize = true + begin + cv.wait(m) + ensure + owned = m.owned? + $stderr.puts "\nThe Thread doesn't own the Mutex!" unless owned + end + end + end + + # wait for m to acquire the mutex + Thread.pass until in_synchronize + # wait until th is sleeping (ie waiting) + Thread.pass until th.stop? + + m.synchronize { + cv.signal + # Wait that the thread is blocked on acquiring the Mutex + sleep 0.001 + # Kill the thread, yet the thread should first acquire the Mutex before going on + th.kill + } + + th.join + owned.should == true + end + + it "supports multiple Threads waiting on the same ConditionVariable and Mutex" do + m = Mutex.new + cv = ConditionVariable.new + n_threads = 4 + events = [] + + threads = n_threads.times.map { + Thread.new { + m.synchronize { + events << :t_in_synchronize + cv.wait(m) + } + } + } + + Thread.pass until m.synchronize { events.size } == n_threads + Thread.pass until threads.any?(&:stop?) + m.synchronize do + threads.each { |t| + # Cause interactions with the waiting threads. + # On TruffleRuby, this causes a safepoint which has interesting + # interactions with the ConditionVariable. + bt = t.backtrace + bt.should be_kind_of(Array) + bt.size.should >= 2 + } + end + + cv.broadcast + threads.each(&:join) + end +end |