diff options
Diffstat (limited to 'spec/ruby/core/conditionvariable/signal_spec.rb')
-rw-r--r-- | spec/ruby/core/conditionvariable/signal_spec.rb | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/spec/ruby/core/conditionvariable/signal_spec.rb b/spec/ruby/core/conditionvariable/signal_spec.rb new file mode 100644 index 0000000000..43a9cc611b --- /dev/null +++ b/spec/ruby/core/conditionvariable/signal_spec.rb @@ -0,0 +1,76 @@ +require_relative '../../spec_helper' + +describe "ConditionVariable#signal" do + it "releases the first thread waiting in line for this resource" do + m = Mutex.new + cv = ConditionVariable.new + threads = [] + r1 = [] + r2 = [] + + # large number to attempt to cause race conditions + 100.times do |i| + threads << Thread.new(i) do |tid| + m.synchronize do + r1 << tid + cv.wait(m) + r2 << tid + end + end + end + + # wait for all threads to acquire the mutex the first time + Thread.pass until m.synchronize { r1.size == threads.size } + # wait until all threads are sleeping (ie waiting) + Thread.pass until threads.all?(&:stop?) + + r2.should be_empty + 100.times do |i| + m.synchronize do + cv.signal + end + Thread.pass until r2.size == i+1 + end + + threads.each {|t| t.join } + + # ensure that all the threads that went into the cv.wait are + # released in the same order + r2.should == r1 + end + + it "allows control to be passed between a pair of threads" do + m = Mutex.new + cv = ConditionVariable.new + repeats = 100 + in_synchronize = false + + t1 = Thread.new do + m.synchronize do + in_synchronize = true + repeats.times do + cv.wait(m) + cv.signal + end + end + end + + # Make sure t1 is waiting for a signal before launching t2. + Thread.pass until in_synchronize + Thread.pass until t1.stop? + + t2 = Thread.new do + m.synchronize do + repeats.times do + cv.signal + cv.wait(m) + end + end + end + + # Check that both threads terminated without exception + t1.join + t2.join + m.should_not.locked? + end +end |