Thanks, Sharon.
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: February-28-12 4:36 PM
To: Cindy Zhu
Cc: staf-users@lists.sourceforge.net
Subject: RE: [staf-users] Request Mutex
Hi, Cindy,
If you don't want to wait for the mutex semaphore to be released, then you can
specify the TIMEOUT option with a timeout duration. For example:
C:\>STAF local SEM REQUEST MUTEX MutexStart GARBAGECOLLECT NO TIMEOUT 10s
Error submitting request, RC: 37
Additional info
---------------
Request did not complete within the requested time
C:\>
If the SEM REQUEST MUTEX request is submitted without a timeout duration, then
it will wait until the semaphore is available to you. If it did not wait, then
you would not know if your request succeeded or failed (or when it succeeded to
know that you probably want to then release the mutex at some point).
Section "8.15.2 REQUEST" in the STAF User's Guide at
http://staf.sourceforge.net/current/STAFUG.htm#HDRSEMSRV talks about the
TIMEOUT option for a SEM MUTEX request as follows:
TIMEOUT specifies a timeout duration indicating the longest you are willing to
wait to gain access to the semaphore. If this option is not specified, the
request will wait indefinitely until the semaphore is available.
Note that there are many STAF service requests that have a TIMEOUT or WAIT
option (e.g. a RESPOOL REQUEST request).
STAF provides an API / API options when submitting a STAF service request to
submit the request asynchronously (instead of synchronously). So, via a
program (e.g. Java, C++, Python, Perl, Tcl), you can submit a STAF service
request asynchronously which means that the request will return immediately
returning the STAF request number. When the STAF service request actually
completes, a message is placed on the submitting handle's queue containing the
request number along with its RC and Result. This is talked about in section
"6.2.5 STAFSubmit2" in the STAF User's Guide (when using C++) and there are
similar sections in the STAF User Guides for Java, Python, Perl, and Tcl.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com<mailto:luc...@us.ibm.com>
(512) 286-7313 or Tieline 363-7313
From: Cindy Zhu <c...@fekete.com<mailto:c...@fekete.com>>
To: Sharon Lucas/Austin/IBM@IBMUS,
Cc:
"staf-users@lists.sourceforge.net<mailto:staf-users@lists.sourceforge.net>"
<staf-users@lists.sourceforge.net<mailto:staf-users@lists.sourceforge.net>>
Date: 02/28/2012 05:13 PM
Subject: RE: [staf-users] Request Mutex
________________________________
Hi Sharon,
Thank you for your reply.
When I sent the STAF command to request a mutex, I got no response back at all.
It seems it was waiting for something. I couldn’t type any commands at all in
the DOS command window. I had to use “Ctrl-C” to terminate. It looked like
this:
C:\>STAF local SEM REQUEST MUTEX MutexStart GARBAGECOLLECT NO
I figured out the mutex I requested was a pending mutex. I think the request
was in a queue. That is why it is waiting.
It would be nice to get back the control even the requested mutex is pending.
Thanks,
Cindy
From: Sharon Lucas [mailto:luc...@us.ibm.com]
Sent: February-28-12 3:57 PM
To: Cindy Zhu
Cc: staf-users@lists.sourceforge.net<mailto:staf-users@lists.sourceforge.net>
Subject: Re: [staf-users] Request Mutex
Hi Cindy,
If the SEM REQUEST MUTEX request worked, you get RC 0 and no message in the
result. You can then query the mutex if you like to see that it is now exists
and is owned. For example:
C:\>STAF local SEM REQUEST MUTEX MutexStart GARBAGECOLLECT NO
Response
--------
C:\>STAF local SEM QUERY MUTEX MutexStart
Response
--------
{
State : Owned
Owner : {
Machine : client1.austin.ibm.com
Handle Name : STAF/Client
Handle : 147
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20120228-16:46:08
Date-Time Acquired : 20120228-16:46:08
Perform Garbage Collection: No
}
Pending Requests: []
}
When you're ready to release the mutex semaphore, you can do so as follows.
Note that if successful, RC=0 and there will be no message in the result.
C:\>STAF local SEM RELEASE MUTEX MutexStart FORCE
Response
--------
C:\>STAF local SEM QUERY MUTEX MutexStart
Response
--------
{
State : Unowned
Owner : <None>
Pending Requests: []
}
C:\>
Note that the section "8.15.2 REQUEST" in the STAF User's Guide at
http://staf.sourceforge.net/current/STAFUG.htm#HDRSEMSRV says in its "Results"
sub-section says:
Results
The result buffer will contain no data on a successful return from a REQUEST
command.
Note that many STAF service requests do not return any data in the result when
successful when there is nothing more to say. The RC=0 indicates that the STAF
service request was successful.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, luc...@us.ibm.com<mailto:luc...@us.ibm.com>
(512) 286-7313 or Tieline 363-7313
From: Cindy Zhu <c...@fekete.com<mailto:c...@fekete.com>>
To:
"staf-users@lists.sourceforge.net<mailto:staf-users@lists.sourceforge.net>"
<staf-users@lists.sourceforge.net<mailto:staf-users@lists.sourceforge.net>>,
Date: 02/28/2012 03:40 PM
Subject: [staf-users] Request Mutex
________________________________
Hi,
I sent a STAF command “STAF local SEM REQUEST MUTEX MutexStart GARBAGECOLLECT
NO” to request a mutex from the command line. But I didn’t see any response.
Can you please tell me how to debug this?
I tried other STAF commands on the same machine and I got responses.
Thanks,
Cindy
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