And problems regarding -lthr (1:1 KSE)

[Julian Elischer]

On Fri, 1 Aug 2003, Mike Makonnen wrote:

> On Fri, Aug 01, 2003 at 12:17:08PM +0900, TeJun Huh wrote:
> >  I forgot to mention about -lthr (1:1 KSE threading) related problems.
> > 
> >  1. If the program is compiled with '-static -lthr', the program
> > crashes at the first thread creation.  Stack trace follows.
> 
> Are you using 5.1-RELEASE or -CURRENT ? I think this has already
> been fixed in -CURRENT.
> 
> >  2. Without -static, the program works fine, but pthread_create()
> > fails with EAGAIN at thread count 110.  B.T.W. pthread_create() return
> > value handling was wrong in the example program.  It always confuses
> > me. :-( How can I increase this limit?  Again, I'm looking for
> > something like ten thousands.
> 
> This is problematic because on i386, libthr uses the LDTs, which
> are limited to 9182. But if I'm not mistaken the first NLDT (17)
> entries are already in use so in reality you can have only
> (9182 - NLDT) threads. You can do this by changing MAXTHR 
> in src/lib/libthr/arch/i386/i386/_setcurthread.c.  You might also
> want to bump up UMTX_QUEUES in src/sys/kern/kern_umtx.c if you
> do that.
> 
> I am not aware of any limits on alpha or sparc64 (but then I'm
> not knowledgeable about either :)
> 
> BTW, libthr uses some of the same code as KSE, but it is not
> based on KSE.

As Mike says..
libthr and libkse are not the same, though both are derived from the
libc_r code.

libthr is 1:1
libkse can be compiled to be 1:1 or M:N
In M:N mode the 8192 limit does not apply as we multilex a lot of
threads to a single LDT entry.




> 
> Cheers. 
> -- 
> Mike Makonnen  | GPG-KEY: http://www.identd.net/~mtm/mtm.asc
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