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<== Date ==> <== Thread ==>

Subject: asyn lock issue?
From: Mark Davis <davism50@msu.edu>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Wed, 15 Jan 2014 11:55:07 -0500
I have an asynPortDriver module I wrote that is currently running fine on an a VME create running RTEMS on a MVME3100 board. Development and testing was done on a Linux SIOC using EPICS version R.3.14.9 without any problems (although it had to be removed from our base config for that version because the 4.21 version of the asyn module used caused problems for other modules).

I now have a project that will require the in-house module (and asyn4-21 or later) to run on a a soft IOC running a newer version of EPICS and I am having problems. In particular, the asynManager appears to be getting a lock and never releasing it.

Current environment:
   asyn version:  4.21
   EPICS base version:  3.14.12.2
OS: 3.2.0-57-generic-pae #87-Ubuntu SMP Tue Nov 12 21:57:43 UTC 2013 i686 i686 i386 GNU/Linux

Below is a trace of the relevant portions of the IOC startup. I added indentation to indicate the operations surrounded by locks. The problem appears to be that asynManager never releases one of the locks. The end result is (not too surprising) that the first attempt to write a value to any of the records linked to the asynPortDriver-based module after IOC initialization effectively locks up the asyn driver.

Has anyone ever run in to this before?  Any idea what could cause this?


                                      #
#===== Setup for simulated FastCounter device (running on eowyn test IOC)=====
drvAsynIPPortConfigure("simFCdev", "192.168.4.28:3333 udp", 0, 0, 1)
asynSetTraceMask("simFCdev", 0, 0xFF)
asynSetTraceIOMask("simFCdev", 0, 0xFF)

#===== initialize in-house asynPortDriver-derived module =====
devFastCounterConfig("simFC", "simFCdev", 1000)
=== devFastCounter::devFastCounter: 'simFC' connected to 'simFCdev' ===
asynSetTraceMask("simFC", 0, 0xff)

  ...

2014/01/13 11:16:14.015 simFC asynManager::queueLockPort locking port
  2014/01/13 11:16:14.015 asynPortDriver:readInt32: function=5, value=0
  2014/01/13 11:16:14.015 asynInt32SyncIO read: 0
2014/01/13 11:16:14.015 simFC queueUnlockPort

2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=SEQS_PER_GROUP, index=4 2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=SEQS_PER_GROUP, index=4

2014/01/13 11:16:14.015 simFC asynManager::queueLockPort locking port
  2014/01/13 11:16:14.015 asynPortDriver:readInt32: function=4, value=10
  2014/01/13 11:16:14.015 asynInt32SyncIO read: 10
2014/01/13 11:16:14.015 simFC queueUnlockPort

2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=COUNT_TIMES, index=9

2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=COUNT_VALUES, index=8

2014/01/13 11:16:14.015 simFC asynManager::queueLockPort locking port(<--- never released)

2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=ACQUIRE, index=0
  2014/01/13 11:16:14.015 simFC -1 registerInterruptUser
2014/01/13 11:16:14.015 asynPortDriver:drvUserCreate: drvInfo=ACQUIRE, index=0

  2014/01/13 11:16:14.015 simFC asynManager::queueLockPort locking port

    2014/01/13 11:16:14.015 asynPortDriver:readInt32: function=0, value=0
    2014/01/13 11:16:14.015 asynInt32SyncIO read: 0

  2014/01/13 11:16:14.015 simFC queueUnlockPort

2014/01/13 11:16:14.015 FastCount:TimePerCount_Read devAsynFloat64::getIoIntInfo registering interrupt 2014/01/13 11:16:14.015 FastCount:TimePerCount_Read devAsynFloat64::getIoIntInfo created ring buffer, size=10
  2014/01/13 11:16:14.015 simFC -1 registerInterruptUser

2014/01/13 11:16:14.015 FastCount:TimePerSeq_Read devAsynFloat64::getIoIntInfo registering interrupt 2014/01/13 11:16:14.015 FastCount:TimePerSeq_Read devAsynFloat64::getIoIntInfo created ring buffer, size=10
  2014/01/13 11:16:14.015 simFC -1 registerInterruptUser

    ...

  iocRun: All initialization complete

    ...

  2014/01/13 11:18:10.965 simFC queueRequest synchronous




Replies:
Re: asyn lock issue? Mark Davis

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