Date: Wed, 21 May 2003 18:55:18 -0400 From: Garrett Rooney <rooneg@electricjellyfish.net> To: Jay Cornwall <jay@evilrealms.net> Cc: Julian Elischer <julian@elischer.org> Subject: Re: USB bulk read & pthreads Message-ID: <4B357E41-8BDF-11D7-88B0-000393CE23F4@electricjellyfish.net> In-Reply-To: <200305212245.h4LMjEVv006239@viper.evilrealms.net>
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On Wednesday, May 21, 2003, at 06:44 PM, Jay Cornwall wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Wednesday 21 May 2003 00:40 am, Julian Elischer wrote: > >> You should load teh "linuxthreads" port >> and link with that.. > > Ah, I hadn't noticed there was a port of this for FreeBSD. I'll give > it a try, thanks. :) > >> under 5.x you will be able to use the native threads (we will have >> several to choose from :-) >> >> under 4.x (I presume that's what you are using) the threading is all >> in >> one process and if a device decides to return "data waiting" in >> select() >> but keeps the reader waiting, it will block the entire process. > > Hmm, actually this is with a FreeBSD 5.0 (RELENG_5_0) system. The > pppoa3 application uses libpthread for its threading implementation; > does FreeBSD 5.0 (5.x?) have a different system for threading as well? Under 5.0 you would be using libc_r, which is a userland threading implementation. A blocking call (like this one) will cause the whole process to block. There are two new threading libraries (libthr, which gives you basic 1-1 kernel threads, and libpthread, which gives you M-N threading) which will be available in later releases of 5.x. -garrett
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