1.7.15-1: pthread_cancel and pthread_kill not working as expected

David Rothenberger daveroth@acm.org
Wed May 23 17:44:00 GMT 2012

On 5/23/2012 10:18 AM, Corinna Vinschen wrote:
> On May 23 18:06, Corinna Vinschen wrote:
>> On May 23 10:52, Corinna Vinschen wrote:
>>> On May 22 15:25, Otto Meta wrote:
>>>>>> Testcase cancel deferred:
>>>>>> Works with 1.7.9 and 20120517 snapshot, fails (hangs) with 1.7.12-1
>>>>>> and 1.7.15-1.
>>>>> If that works in the snapshot anyway, I'm not going to look into that
>>>>> one.
>>>> It worked in the reduced testcase with sem_wait(). With read() itÂ’s
>>>> still half-broken. See below.
>>>>>> Testcase cancel asynchronous:
>>>>>> Async cancel seems to have no effect with any tested version.
>>>>> I think I found a solution for this problem.  See the comment in the
>>>>> patch at
>>>>> http://sourceware.org/cgi-bin/cvsweb.cgi/src/winsup/cygwin/thread.cc.diff?cvsroot=src&r1=1.258&r2=1.259
>>>>> Please test the today's developer snapshot.
>>>> Asynchronous cancel seems to work as well as deferred cancel now. Thanks.
>>>> Both cancel types work with sem_wait() and pause() now, but for threads
>>>> blocked in read() theyÂ’re still unreliable. Only one of three blocked
>>>> threads is killed in the attached updated testcases.
>>> Just to let you know I'm working on it.  This will take some time.
>>> During debugging I stumbled over a heisenbug.  As soon as I remove the
>>> "Thread %i woke up just fine" printf from your test application, the
>>> read function reurns with a "Bad address" error.  So far I have onlya
>>> vague hunch what the cause may be.  Stay tuned.
>> Half of the solution is now checked in to CVS.  The other half is a bad
>> hack to workaround a shortcoming in newlib's stdio functions.  I'd rather
>> have a solution in newlib.  see my request on the newlib ML:
>> http://cygwin.com/ml/newlib/2012/msg00188.html
> Ok, for the time being I checked in my workaround.  Please test the
> today's developer snapshot.

I tried installing this snapshot and found most things hung.
Specifically, I ran ash in a Windows cmd window, then tried

  /bin/echo foo

I tried mintty too but bash hangs before I get a prompt.

"echo foo" worked fine, though.

David Rothenberger  ----  daveroth@acm.org

Glib's Fourth Law of Unreliability:
        Investment in reliability will increase until it exceeds the
        probable cost of errors, or until someone insists on getting
        some useful work done.

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