USB bulk read & pthreads

[Julian Elischer]

You should load teh "linuxthreads" port
and link with that..

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.


On Wed, 21 May 2003, Jay Cornwall wrote:

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> 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
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