[DrJava] [ drjava-Bugs-771762 ] Deadlock in debugger/listeners

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Bugs item #771762, was opened at 2003-07-15 17:40
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: Debugger
Group: Makes DrJ unstable
Status: Open
Resolution: None
Priority: 7
Submitted By: Charles Reis (csreis)
Assigned to: Charles Reis (csreis)
Summary: Deadlock in debugger/listeners

Initial Comment:
There is currently a race condition which can cause
deadlock in the debugger, because one thread has a lock
on the debugger and is trying to notify listeners, and
another thread has a lock on the EventNotifier and is
trying to call a synchronized method on the debugger. 
(The debugger is synchronized for obvious threading
reasons, and the EventNotifier is synchronized so that
listeners cannot be added or removed while a
notification is in progress.)

This illustrates a much more serious problem.  Any code
in a listener that calls a synchronized method on an
object can potentially cause deadlock, since a
different thread could already have the lock on that
object and could be attempting to notify listeners of
an event (thus attempting to acquire the EventNotifier
lock).

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You can respond by visiting: 
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