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require_relative '../../spec_helper'
describe "Mutex#synchronize" do
it "wraps the lock/unlock pair in an ensure" do
m1 = Mutex.new
m2 = Mutex.new
m2.lock
synchronized = false
th = Thread.new do
lambda do
m1.synchronize do
synchronized = true
m2.lock
raise Exception
end
end.should raise_error(Exception)
end
Thread.pass until synchronized
m1.locked?.should be_true
m2.unlock
th.join
m1.locked?.should be_false
end
it "blocks the caller if already locked" do
m = Mutex.new
m.lock
lambda { m.synchronize { } }.should block_caller
end
it "does not block the caller if not locked" do
m = Mutex.new
lambda { m.synchronize { } }.should_not block_caller
end
it "blocks the caller if another thread is also in the synchronize block" do
m = Mutex.new
q1 = Queue.new
q2 = Queue.new
t = Thread.new {
m.synchronize {
q1.push :ready
q2.pop
}
}
q1.pop.should == :ready
lambda { m.synchronize { } }.should block_caller
q2.push :done
t.join
end
it "is not recursive" do
m = Mutex.new
m.synchronize do
lambda { m.synchronize { } }.should raise_error(ThreadError)
end
end
end
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