Date: Wed, 21 May 2003 00:13:07 +0100 From: Jay Cornwall <jay@evilrealms.net> To: freebsd-hackers@freebsd.org Subject: USB bulk read & pthreads Message-ID: <200305210013.09834.jay@evilrealms.net>
index | next in thread | raw e-mail
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi I've been trying (unsuccessfully) to make the thread-based pppoa3 program (from http://speedtouch.sf.net/) able to work correctly under FreeBSD. Near identical code works fine under Linux, but the threading doesn't work at all in FreeBSD. The problem seems to be a result of reading from a USB endpoint file descriptor, which invokes tsleep() within the kernel (/sys/dev/usb/usbdi_util.c:432) while it waits for data to read. This has the effect of blocking the whole process, rather than just the thread which called the read. I'm sure there are good reasons for implementing it in this way, but I'd be interested to hear what they are, and if any alternative approaches had been/are being considered. Forgive my lack of knowledge with the FreeBSD kernel, I've only been using it for a couple of weeks. :( Cheers, Jay - -- http://www.evilrealms.net/ - Systems Administrator & Developer http://www.ic.ac.uk/ - Imperial College, 2nd year CS student -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE+yraFfJLn3O/2GbERAsFGAJ947XIElRiR0sz7U7O1nq73N0ccMACcD0bT fWLxgfMSx9n4/1ktz+kOclU= =1SjD -----END PGP SIGNATURE-----help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200305210013.09834.jay>