topic Pthread implementation in Operating System - HP-UX

Pthread implementation

Stephen Hoare — Fri, 07 Mar 2003 11:24:15 GMT

Does anyone know if pthreads are implemented as light weight processes or not.

For example is there 1 kernal thread per pthread or is there 1 kernal thread which is linked to the process which owns the pthread.

I've developing on HPUX 11.i using gcc, C++ and POSIX threads

Re: Pthread implementation

Steve Steel — Fri, 07 Mar 2003 11:35:59 GMT

Hi

Read

/usr/share/doc/proc_mgt.txt
Explains Kernel threads well

Steve Steel

Re: Pthread implementation

Mike Stroyan — Fri, 07 Mar 2003 16:05:56 GMT

The -lpthread threads on 11i, 11.11, are 1x1 kernel threads.
The 11iv1.6, 11.22, release changes for programs compiled on 11.22. It defaults to an MxN thread model where user threads share a pool of kernel threads.
You can control that with pthread attributes and the pthread_attr_setscope function.
There are details of the 11.22 changes in the release notes at
http://www.docs.hp.com./cgi-bin/onlinedocs.py?mpn=5187-0701&service=hpux&path=../5187-0701/00/00/67&title=HP-UX%2011i%20Version%201.6%20Release%20Notes