[Chicken-janitors] [Chicken-bugs] #342: scheduler functions that block threads should check for already blocked threads

[Chicken Scheme]

#342: scheduler functions that block threads should check for already blocked
threads
-------------------+--------------------------------------------------------
Reporter:  felix   |       Owner:                    
    Type:  defect  |      Status:  new               
Priority:  major   |   Component:  core libraries    
 Version:  2.7     |    Keywords:  threads, scheduler
-------------------+--------------------------------------------------------
 Functions like `##sys#thread-block-for-timeout!`, etc. should check
 whether the thread is already blocked. If it is it might be possible that
 a threads shows up in multiple queues (fd-list, timeout list, ...) in an
 uncontrolled manner (this situation should normally be covered, but it's
 better to check anyway).

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Ticket URL: <http://trac.callcc.org/ticket/342>
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