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
(512) 286-7313 or Tieline 363-7313
From: Cindy Zhu <c...@fekete.com>
To: Sharon Lucas/Austin/IBM@IBMUS,
Cc: "staf-users@lists.sourceforge.net"
<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
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
(512) 286-7313 or Tieline 363-7313
From: Cindy Zhu <c...@fekete.com>
To: "staf-users@lists.sourceforge.net" <
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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