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To: "'Ken Brown'" <kbrown AT cornell DOT edu>
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Subject: Sv: Sv: Sv: Sv: Named pipes and multiple writers
Date: Sat, 28 Mar 2020 13:10:04 +0100
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From: Kristian Ivarsson via Cygwin <cygwin AT cygwin DOT com>
Reply-To: sten DOT kristian DOT ivarsson AT gmail DOT com
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>On 3/27/2020 10:53 AM, sten DOT kristian DOT ivarsson AT gmail DOT com wrote:
>>> On 3/26/2020 7:19 PM, Ken Brown via Cygwin wrote:
>>>> On 3/26/2020 6:39 PM, Ken Brown via Cygwin wrote:
>>>>> On 3/26/2020 6:01 PM, sten DOT kristian DOT ivarsson AT gmail DOT com wrote:
>>>>>> The ENIXIO occurs when parallel child-processes simultaneously 
>>>>>> using O_NONBLOCK opening the descriptor.
>>>>>
>>>>> This is consistent with my guess that the error is generated by 
>>>>> fhandler_fifo::wait.  I have a feeling that read_ready should have 
>>>>> been created as a manual-reset event, and that more care is needed 
>>>>> to make sure it's set when it should be.
>>>>>
>>>>>> I could provide a code-snippet
>>>>>> to reproduce it if wanted ?
>>>>>
>>>>> Yes, please!
>>>>
>>>> That might not be necessary.  If you're able to build the git repo 
>>>> master branch, please try the attached patch.
>> 
>>> Here's a better patch.
>> 
>> 
>> I finally succeeded to build latest master (make is not my favourite 
>> tool) and added the patch, but still no success in my little 
>> test-program (see
>> attachment) when creating a write-file-descriptor with O_NONBLOCK

>Your test program fails for me on Linux too.  Here's the output from one
run:

You're right. That was extremely careless of me to not test this in Linux
first :-)

I can assure that we have a use case that works on Linux but not in Cygwin,
but it seems like I failed to narrow it down in the wrong way

I'll try to rearrange my code (that works in Linux) to mimic our application
but in a simple way (I'll be back)

[snip]

>Ken

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