All,
It would vastly simplify EPICS if we didn't have
to worry about two execution models: multi-threaded and
single-threaded. It occurs to me that possibly all commonly
used operating systems support multiple threads of execution
in one process at this time.
Do any of you know of a successful, commonly used, operating
system that does not support multiple threads of execution
in one process?
For instance, is anyone still using SUNOS4 at this point?
I suspect that SGI UNIX and HPUX both support multiple
threads of execution in one process. Can anyone confirm this.
I have been looking briefly at DEC threads and this appears
to be a real threading package: if a thread makes a
blocking VMS system call it will _not_ prevent other threads
from running. Are there any VMS guru's out there that can
confirm or deny this conclusion? Perhaps there are versions
of VMS in use that don't allow use of DEC threads? The book I
have on DEC threads is from 1991.
Another issue:
Even if we discover that all OS support a multi-threaded model
we are not out of the woods. Many client side tools are coded
following a single threaded model so we would need to preserver
backwards compatibility, and therefore be careful to run
asynchronous callbacks only from the primary thread of control?
Jeff
______________________________________________
Jeffrey O. Hill E-mail [email protected]
LANL MS H820 Voice 505 665 1831
Los Alamos NM 87545 USA FAX 505 665 5107
- Replies:
- Re: DEC Threads J. Frederick Bartlett ([email protected])
- Navigate by Date:
- Prev:
invitation to new discussion of java GUI's Chip Watson
- Next:
Re: DEC Threads J. Frederick Bartlett ([email protected])
- Index:
1994
1995
1996
1997
1998
<1999>
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
invitation to new discussion of java GUI's Chip Watson
- Next:
Re: DEC Threads J. Frederick Bartlett ([email protected])
- Index:
1994
1995
1996
1997
1998
<1999>
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
|