[lkml]   [2019]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch 07/44] posix-cpu-timers: Simplify sighand locking in run_posix_cpu_timers()
On Mon, Aug 19, 2019 at 04:31:48PM +0200, Thomas Gleixner wrote:
> run_posix_cpu_timers() is called from the timer interrupt. The posix timer
> expiry always affects the current task which got interrupted.
> sighand locking is only racy when done on a foreign task, which must use
> lock_task_sighand(). But in case of run_posix_cpu_timers() that's
> pointless.
> sighand of a task can only be dropped or changed by the task itself. Drop
> happens in do_exit()

Well, that's only in case of autoreap. Otherwise this is dropped by the reaper.

> changing sighand happens in execve().

 \ /
  Last update: 2019-08-21 14:11    [W:0.334 / U:7.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site