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

From: Ken Brown
Subject: bug#20843: 24.5; Profiler error: "Invalid sampling interval"
Date: Sat, 20 Jun 2015 17:47:21 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 6/20/2015 3:10 PM, Eli Zaretskii wrote:
Date: Sat, 20 Jun 2015 15:02:28 -0400
From: Ken Brown <address@hidden>
CC: address@hidden

On 6/18/2015 4:57 AM, Eli Zaretskii wrote:
From: Sebastien Vauban <address@hidden>
Date: Thu, 18 Jun 2015 10:37:02 +0200

When trying to start the profiler under Cygwin Emacs 24.5, I get this:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (error "Invalid sampling interval")
    call-interactively(profiler-start record nil)

Can you step with GDB into setup_cpu_timer, and see what goes wrong
there?  I suspect this portions:

No, the problem is that Cygwin's setitimer supports only ITIMER_REAL, so
the call to setitimer(ITIMER_PROF,...) in profiler.c:315 fails.

Then I guess the configure-time test for setitimer should also test

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?

 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.


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