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bug#20843: 24.5; Profiler error: "Invalid sampling interval"


From: Sebastien Vauban
Subject: bug#20843: 24.5; Profiler error: "Invalid sampling interval"
Date: Mon, 22 Jun 2015 10:00:04 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (windows-nt)

Ken Brown <address@hidden> writes:
> On 6/21/2015 10:56 AM, Eli Zaretskii wrote:
>>> Date: Sat, 20 Jun 2015 17:47:21 -0400
>>> From: Ken Brown <address@hidden>
>>> CC: address@hidden, address@hidden
>>>
>>>> Then I guess the configure-time test for setitimer should also test
>>>> for ITIMER_PROF.
>>>
>>> I'd be glad to give this a try, but I don't have any experience writing
>>> autoconf macros.  Is there a standard macro to test whether a function
>>> accepts a particular argument?  If not, can you (or anyone) point me to
>>> an example that I can imitate?
>>
>> Actually, perhaps I misunderstood you: are you saying that Cygwin does
>> have ITIMER_PROF defined in the appropriate header, but when setitimer
>> is called with it, it always fails?
>
> Yes.
>
>> If so, we cannot test this at
>> configure time, because it means we will have to run a program, which
>> is not a good idea.
>>
>> So in that case, I think we should simply disable the CPU profiler on
>> Cygwin using "#ifndef __CYGWIN__" or some such.
>
> Done as commit 5fac0de.
>
>>>>   Also, the diagnostics should be improved, as the
>>>> wording is misleading in that case.
>>>
>>> As it stands, profiler-cpu-start reports "Invalid sampling interval"
>>> whenever setup_cpu_timer fails to start the timer, regardless of the
>>> reason.  I'll try to improve this.
>>
>> Yes, please.

For me to understand, does this mean we never will be able to start the
profiler under Cygwin Emacs?





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