CVS commit: [nathanw_sa] basesrc/lib/libpthread

[Jason R Thorpe <thorpej%netbsd.org@localhost>]

Module Name:    basesrc
Committed By:   thorpej
Date:           Fri Nov  1 17:06:33 UTC 2002

Modified Files:
        basesrc/lib/libpthread [nathanw_sa]: pthread.h pthread_sa.c

Log Message:
* Default to a 100mS round-robin timer; there are a great many
  applications that assume concurrency even on a uniprocessor.
  (These applications are, of course, broken, but there's not
  much we can do about it.)
* Add pthread_getrrtimer_np() and pthread_setrrtimer_np() functions
  which provide access to the round-robin timer to application programs.
  Setting the rrtimer to 0 will disable timeslicing.

Per discussion with Loren Rittle (on libstdc++%gcc.gnu.org@localhost) and
Nathan Williams (privately).  The 100mS default interval is chosen
because timeslicing is largely for user-visible parallelism, and
the 100mS interval results in less overhead while still providing
a reasonable amount of user-visible parallelism.


To generate a diff of this commit:
cvs rdiff -r1.1.2.15 -r1.1.2.16 basesrc/lib/libpthread/pthread.h
cvs rdiff -r1.1.2.31 -r1.1.2.32 basesrc/lib/libpthread/pthread_sa.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.