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Date:	Mon, 14 Aug 2017 10:35:55 +0200
From:	Houder <houder AT xs4all DOT nl>
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Subject:	Re: Signal delivered while blocked (2)
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On 2017-08-14 08:03, Houder wrote:
> On Fri, 4 Aug 2017 00:44:45, Noah Misch wrote:
>> --UugvWAfsgieZRqgk
>> Content-Type: text/plain; charset=us-ascii
>> Content-Disposition: inline
>> 
>> The attached demonstration program blocks signals (with sigprocmask()) 
>> to
>> achieve mutual exclusion between signal handlers.  It aborts upon 
>> receipt of a
>> blocked signal.  On "CYGWIN_NT-10.0 2.7.0(0.306/5/3) 2017-02-12 13:18 
>> x86_64",
>> signals regularly arrive despite being blocked.  Essential parts of 
>> the
>> program include handling two signal numbers and having handlers run 
>> for at
>> least 1-2ms; this problem goes away if I remove one of those 
>> attributes.
>> GNU/Linux, AIX, Solaris, and "CYGWIN_NT-6.0 1.7.27(0.271/5/3) 
>> 2013-12-09 11:57
>> i686" never deliver a blocked signal to this program.  I think this 
>> Cygwin
>> behavior is non-conforming.
> 
> Hi Noah,
> 
> I do not think that Cygwin is the problem here; your code is the 
> problem
> here, I believe.
[snip]

> You cannot use SIG_SETMASK in that context.

You cannot use SIG_SETMASK in that context in the way you do.

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