PCthreads(tm)

                          The TriTechnologies Company
                               16209 Northup Way
                             Bellevue, WA   98008
                                (206) 957-1579

                        Compuserve:        70272, 3671

We are pleased to announce the general availability of PCthreads for MSDOS,
PCthreads/DOS V1.0.  PCthreads/DOS is intended to provide an applications
programming interface that is fully compliant with draft 4 of the POSIX
1003.4a standard for multithread services.

The PCthreads package offers the following capabilities:

    o Create multiple threads within a single application.  The number of
      threads is limited only by your system's memory.  Using the small memory
      model, you should be able to support up to 40 or 50 threads
      simultaneously executing (depending on stack and local heap requirements).

      Context switching is very fast.  On a 33 Mhz 386 PC, it takes approx
      150 microseconds to create a thread, context switch to that thread,
      execute a null procedure (i.e., call and return), terminate the thread,
      and then context switch back to the creating thread.

    o Full mutex support including multiple mutex scheduling protocols, lock,
      unlock, and trylock.  In PCthreads, locking and unlocking mutexes is
      very fast.  Under noload conditions a mutex can be locked/unlocked
      in less than 25 machine instructions.

    o Full condition variable support including signal, broadcast, timed
      waits.

    o Multiple, priority-based, fully-preemptive and individual thread
      scheduling policies including preemptive priority-decay, round-robin,
      and fcfs.

    o Structured Exception Handling using TRY-CATCH-ENDTRY-FINALLY semantics.
    
The PCthreads implements a "handle-based" API and is very easy to use.  To
this end, the PCthreads/DOS kernel provides a thread execution trace facility
allowing programmers to trace the execution of all threads in their application.
This is very useful when debugging the sometimes non-intuitive behavior of
multiple threads of execution.

                                     Pricing
                                     
    PCthreads/DOS V1.0
    
         Personal Use License
              Small memory model                            No Charge
              Large memory model                            $45.00
         Site Licensing                                     Please Inquire
         Source License                                     Please Inquire

         Documentation (includes source-disk to example applications)
         
              On-Disk (you specify printer)                 $20.00
              Hardcopy (200 page, laser printed, bound)     $30.00

We do not charge for support and will try to be as responsive as possible.
To that end, you may send us mail on compuserve at 70272, 3671.  You may
also call our customer assistance telephone line at (206) 957-1579.  If you
call the customer assistance number, please leave an electronic address where
we can reply, if that is possible.  If not, then leave a number where we can
call you back.

    Copyright (C) 1991, The TriTechnologies Company.  All rights reserved
    PCthreads(tm) is a registered trademark of The TriTechnologies Company
    UNIX(tm) is a trademark of AT&T somewhere in New Jersey.
    MS-DOS(tm) is a trademark of Microsoft Corporation, Redmond, WA.