Re: Scheduler: SIGSTOP on multi threaded processes

[Daniel Jacobowitz]

On Wed, May 04, 2005 at 02:16:24PM -0400, Richard B. Johnson wrote:
> The kernel doesn't do SIGSTOP or SIGCONT. Within init, there is
> a SIGSTOP and SIGCONT handler. These can be inherited by others
> unless changed, perhaps by a 'C' runtime library. Basically,
> the SIGSTOP handler executes pause() until the SIGCONT signal
> is received.
> 
> Any delay in stopping is the time necessary for the signal to
> be delivered. It is possible that the section of code that
> contains the STOP/CONT handler was paged out and needs to be
> paged in before the signal can be delivered.
> 
> You might quicken this up by installing your own handler for
> SIGSTOP and SIGCONT....

I don't know what RTOSes you've been working with recently, but none of
the above is true for Linux.  I don't think it ever has been.

-- 
Daniel Jacobowitz
CodeSourcery, LLC
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