Date: Sat, 1 Oct 2011 13:44:56 +0800 From: Adrian Chadd <adrian@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: how are callouts handled in cpu_idle() ? Message-ID: <CAJ-Vmoksy68YmTXAQ1S87-%2BFMUHjZ-K0TOV0OUm3hQpYGZhXHw@mail.gmail.com>
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Hi, What happens if this occurs: * cpu_idle() is entered * you enter critical_enter() and call cpu_idleclock() * an interrupt occurs, scheduling an immediate callout * .. but you've already set the clock register, so it won't be serviced until the wait returns. Perhaps interrupts have to be disabled before critical_enter() and cpu_idletick() to ensure an interrupt-driven callout doesn't get delayed? Adrian
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