On 4/09/2013 4:47 AM, Kirk Wolf wrote:
A little off topic, but notice how msgrcv is SRB enabled, but not msgsnd or
msgget or msgctl ? PIty :-(
AFAIK, all message queue services are task only. I agree it's a shame.
They would have been rather useful for
communicating with an enclave SRB :^(
Kirk Wolf
Dovetailed Technologies
http://dovetail.com
On Wed, Aug 28, 2013 at 9:06 PM, David Crayford <[email protected]> wrote:
On 29/08/2013 12:13 AM, Paul Gilmartin wrote:
On Tue, 27 Aug 2013 19:48:25 -0400, Blaicher, Christopher Y. wrote:
There are lots of ways to do this. Some of the questions you have to
first ask are: 1) Are the tasks asynchronous to each other? 2) Can there be
more than one slave task? 3) What are you attempting to accomplish with
sub tasks?
Can POSIX pipes be used to communicate among tasks/subtasks?
The important question is, if one task blocks on a read, does the
whole job block?
POSIX message queues would be a better fit. Call *BPX1QGT*(msgget) with
IPC_PRIVATE to create a private message queue for inter task communication
(not IPC). You can use PLO for serialization with the IPC_PLO/IPC_PLO2
flags.
All the blocking is done for you and they scale ok. My testcase can
process around 200,000 16k recs per sec on a 2 engine z114. Of course,
POSIX shared memory with semaphores would scale better because you don't
have to
move data around.
(I've used pipes to implement some crude dispatching in shell.
These were named pipes because shell doesn't provide adequate
pipe primitives. C, Rexx, and Assembler do better.)
-- gil
------------------------------**------------------------------**
----------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
------------------------------**------------------------------**----------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
