USB bulk read & pthreads
Garrett Rooney
rooneg at electricjellyfish.net
Wed May 21 15:55:19 PDT 2003
On Wednesday, May 21, 2003, at 06:44 PM, Jay Cornwall wrote:
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> 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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