The current build on 10.20 relies on DCE pthreads which doesn't quite work right... Wan-Teh write: The "pthreads" on HP-UX 10.20 are not true POSIX threads but rather DCE threads. It is a user-level implementation and requires renaming a bunch of system calls (adding a cma_ prefix, I remember) to the modified versions that work with DCE threads. If you use a system call that is not modified and renamed to work with DCE threads, it may not work. One option is to use NSPR's own user-level threads. It may or may not work better. Build NSPR with CLASSIC_NSPR=1.

Building with CLASSIC_NSPR=1 has not solved the problem in my experience. Do you know of any documentation for CMA/DCE threads on 10.20? I've not been able to find it in HP's support site. How about NSPR source code where you know it works?

to build NSPR threads currently (cls is working on configure for nspr) export MOZILLA_CLIENT=1 cd nsprpub gmake CLASSIC_NSPR=1 then run configure --with-nspr=<nspr_dir>

Moving all threading bugs to XPCOM. See bug 160356.