Date: Tue, 30 Mar 2004 09:13:34 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Doug Rabson <dfr@nlsystems.com> Cc: freebsd-threads@freebsd.org Subject: Re: Thread Local Storage Message-ID: <Pine.GSO.4.10.10403300906270.11014-100000@pcnet5.pcnet.com> In-Reply-To: <200403300935.49999.dfr@nlsystems.com>
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On Tue, 30 Mar 2004, Doug Rabson wrote: > On Monday 29 March 2004 23:36, Daniel Eischen wrote: > > 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. It works for libc, since libc knows whether it is threaded or not. I think libc is always going to be sort of special, especially since we seem to need the jump table for the pthread_* functions to handle the static case. I'd be in favor of not providing static thread libraries, but there was too much opposition when I brought it up... > It would even work for evil cases where libpthread is loaded after > program startup with dlopen. -- Dan Eischen
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