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__profile_frequency
- From: Richard Henderson <rth at twiddle dot net>
- To: libc-alpha at gcc dot gnu dot org
- Date: Mon, 30 Jun 2003 12:58:19 -0700
- Subject: __profile_frequency
Um, so how's
45 tim.it_interval.tv_sec = 0;
46 tim.it_interval.tv_usec = 1;
47 tim.it_value.tv_sec = 0;
48 tim.it_value.tv_usec = 0;
49 __setitimer(ITIMER_REAL, &tim, 0);
50 __setitimer(ITIMER_REAL, 0, &tim);
51 if (tim.it_interval.tv_usec < 2)
52 return 0;
53 return (1000000 / tim.it_interval.tv_usec);
supposed to work? AFAICS there's no reason for the kernel
(1) not to round down instead of up and (2) not do something
else legal like schedule in between the two __setitimer calls.
On alpha-linux 2.5.73, tim is always zero after the second
call, which results in divide-by-zero FPE in __sprofil.
Why wouldn't this be the same as __getclktck?
r~