linux-kernel - Re: Any lightweight way for one thread to force another thread to suspend execution?

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Date:	Sat, 21 Jun 2008 18:55:37 -0700 (PDT)
From:	"Eric Smith" <eric@...uhaha.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Andi Kleen" <andi@...stfloor.org>
Subject: Re: Any lightweight way for one thread to force another thread to  
     suspend execution?

Andi wrote:
> Any such mechanism will need a syscall, and it's unlikely that
> any syscall will get much cheaper than a kill(SIGSTOP)

But is there a way for the process sending the SIGSTOP to wait until it
has taken effect?  I need a method to *synchronously* stop another
thread.  That's why I thought I probably needed something more
elaborate than SIGSTOP, though I'd like to minimize the number of
system calls required.

Thanks!
Eric Smith

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