[RFC] Implement pthread_getthreadid_np(3) and pthread_getunique_np(3)

[Kostik Belousov]

On Sat, Feb 05, 2011 at 02:24:09AM -0500, Jung-uk Kim wrote:
> On Friday 04 February 2011 04:33 pm, Kostik Belousov wrote:
> > On Fri, Feb 04, 2011 at 02:09:10PM -0500, Jung-uk Kim wrote:
> > > Our pthread_t is not an integral type and it causes a lot of
> > > trouble porting some software, which relies on Linux's gettid()
> > > or similar syscalls:
> > >
> > > http://www.kernel.org/doc/man-pages/online/pages/man2/gettid.2.ht
> > >ml
> > >
> > > For example:
> > >
> > > http://docs.freebsd.org/cgi/mid.cgi?201102032111.13479.jkim
> > >
> > > To solve this problem, I implemented two functions:
> > >
> > > http://people.freebsd.org/~jkim/thr_tid.diff
> > >
> > > Basically, they are AIX's pthread_getthreadid_np(3) and
> > > pthread_getunique_np(3) look-alikes:
> > >
> > > http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/apis/
> > >users_22.htm
> > > http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/apis/
> > >users_23.htm
> > >
> > > Please let me know what you think.
> >
> > Why do you need new functions available in stubs ?
> 
> Oops, my bad.  Fixed:
> 
> http://people.freebsd.org/~jkim/thr_tid2.diff
> 
> > Also, would it be better to return proper id even if threading is
> > not initialized, instead of EINVAL  ?
> 
> Because I want it to be fast and cause no side-effect, no.
You can allocate static lwpid_t self_tid variable, and in case
threading is not initialized yet, and self_tid == 0, do
self_tid = thr_self(). Otherwise, if threading is initialized and
self_tid != 0, return self_tid.

BTW, what should be the behaviour of new functions after fork() ?
Is it undefined ?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 196 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-threads/attachments/20110205/1f85fe22/attachment.pgp