Date: Thu, 02 Aug 2012 10:25:04 +0800 From: David Xu <listlog2011@gmail.com> To: Daniel Rudy <dr2867@pacbell.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Enumerating sleeping threads Message-ID: <5019E500.8060105@gmail.com> In-Reply-To: <5019E209.50109@pacbell.net> References: <5019E209.50109@pacbell.net>
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On 2012/8/2 10:12, Daniel Rudy wrote: > Hello, > > What is the best way to enumerate the sleeping threads via > sleepqueue(9)? Furthermore, when enumerating the threads that are on > the run queue, what locks are needed, if any? sleepqueue hash bucket is private data structure in subr_sleepqueue.c, I think you can not access it outside of the file. One way to enumerate the sleeping threads is iterating all threads in the system, and check their states. proc.h contains two macros: FOREACH_PROC_IN_SYSTEM FOREACH_THREAD_IN_PROC To access thread state, you should use thread lock, call thread_lock() and thread_unlock(). thread lock is not fixed, it might be sleep-queue's spinlock or per-cpu runqueue lock, there even is a blocked spin-lock for intermediate state change. > Thank you. >
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