Date: Tue, 30 Mar 2004 10:03:23 -0800 From: Marcel Moolenaar <marcel@xcllnt.net> To: Doug Rabson <dfr@nlsystems.com> Cc: freebsd-threads@freebsd.org Subject: Re: Thread Local Storage Message-ID: <20040330180323.GA57824@ns1.xcllnt.net> In-Reply-To: <200403300935.49999.dfr@nlsystems.com> References: <Pine.GSO.4.10.10403291718320.29683-100000@pcnet5.pcnet.com> <200403300935.49999.dfr@nlsystems.com>
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On Tue, Mar 30, 2004 at 09:35:49AM +0100, Doug Rabson wrote: > > > > > > I'd quite like to see us use it for stuff like errno, _res and > > > other uglification currently in libc. Not until the 6.x timeframe > > > though. > > > > I'd like to see libc free of TLS ;-) The _res stuff can be > > avoided by modifying the implementation to use thread-safe > > APIs. The current _res stuff can _almost_ be eliminated > > by passing using pthread_getspecific() once and passing > > the _res around internal APIs. That's actually a pretty > > simple change. > > Unfortunately pthread_setspecific() and pthread_getspecific() don't work > for non-threaded programs whereas 'int __thread errno' works anywhere. Yes. It's also far more optimal. > It would even work for evil cases where libpthread is loaded after > program startup with dlopen. Yup. I think it's important to have it work. -- Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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