Recursively locking on a mutex results in deadlock
--------------------------------------------------
Key: JRUBY-2545
URL: http://jira.codehaus.org/browse/JRUBY-2545
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.1.1
Environment: Mac OS X Leopard with Java 1.5
Reporter: Matt Fletcher
Attachments: test_recursive_mutex_locking.rb
Attached is a test case that demonstrates how recursively synchronizing on a
mutex results in deadlock. Here is the body of the test:
{noformat}
def test_mutex_cannot_be_synchronized_twice
m = Mutex.new
begin
m.synchronize do
m.synchronize do
end
end
flunk "should have raised a ThreadError when synchronizing twice"
rescue Exception => ex
assert_kind_of ThreadError, ex, "the exception was not the right type"
assert_equal "stopping only thread\n\tnote: use sleep to stop forever",
ex.message, "wrong message in the exception"
end
end
{noformat}
This test passes on MRI and deadlocks on JRuby 1.1.1. The test shows that and
exception is raised, the correct exception type is used, and message from MRI
is given.
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