Date: Mon, 30 Oct 2006 19:23:02 +0100 From: gnn@freebsd.org To: David Xu <davidxu@freebsd.org> Cc: freebsd-threads@freebsd.org Subject: Re: libthr status Message-ID: <m27iyhll2x.wl%gnn@neville-neil.com> In-Reply-To: <200610302150.05499.davidxu@freebsd.org> References: <200610301649.26429.davidxu@freebsd.org> <m2lkmyksls.wl%gnn@neville-neil.com> <200610302150.05499.davidxu@freebsd.org>
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At Mon, 30 Oct 2006 21:50:05 +0800, David Xu wrote: > > [1 <text/plain; iso-8859-1 (7bit)>] > On Monday 30 October 2006 18:25, gnn@freebsd.org wrote: > > > > 1.6) setrlimit for number of kenrel threads, it is not done, one-day > > > work. > > > > Cool that it's only a day. Is this something you're hacking on now? > > > > I will hack at kernel side, but who will hack userland utilities ? > e.g the /usr/bin/limits program. > How hard is that to do? If it's "easy" then I can sign up to do that. > > > 1.7 CPU binding API, not done in libthr, found in other OSes. libpthread > > > does not support it either. > > > > > > 1.8 C++ object unwinding when pthread_exit is called(), I found it > > > is support by debian Linux and Solaris, I have sample implementation > > > for libthr. > > > > Cool as well, though not as big a deal as setrlimit. > > > > > 1.9) I forgot something. > > > > > > 2) Things can only be used by root: > > > > > > 2.1) the real-time scheduling options can only be used by root, e.g, > > > if you call pthread_attr_setschedpolicy() with parameter SCHED_FIFO > > > or SCHED_RR, the thread can only be created by root, normal user > > > will get EPERM errno. you can use it in libpthread, but it is not > > > real-time, it is a static priority scheduling in userland scheduler, > > > if you want to preemptable other threads or processes in the system > > > when playing real-time multimedia or military program, no way! > > > > > > 2.2) the real-time scheduling is not safe, it can deadlock itself and > > > the whole system if program behavors incorrectly, it should only be > > > used by trusted programs. > > > > Are these (can these be) documented in the man pages? > > > No, they are not documented. > If these limitations will be there for a while can you update the man page? If you like I can review that change for correctness. Best, George
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