Experimental Physics and
Industrial Control System

<[email protected]> · Wed, 1 May 2013 10:13:32 +0000

There appears to be a minor resource leak in EPICS base when running on Windows.

This was tested on Windows Server 2008 R2 SP1 and EPICS R3.14.12.3 however I believe it will effect all Windows versions and earlier versions of EPICS.

To reproduce this issue:

  *   Create a basic IOC with a single PV
  *   start the IOC and monitor the process using Sysinternals process explorer http://technet.microsoft.com/en-us/sysinternals/bb896653
  *   do a caget on the PV
  *   watch the thread handles increase by 2 for each caget

I only expect this to cause a problem for very long running IOCs.

The change below stopped this resource leak:-

Regards,
   giles...

Index: src/libCom/osi/os/WIN32/osdThread.c
===================================================================

--- src/libCom/osi/os/WIN32/osdThread.c (revision 89701)
+++ src/libCom/osi/os/WIN32/osdThread.c (working copy)
@@ -7,7 +7,7 @@
 * and higher are distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 \*************************************************************************/
-
+
 /*
  * Revision-Id: [email protected]
  *
@@ -247,9 +247,8 @@
         LeaveCriticalSection ( & pGbl->mutex );

         /* close the handle if its an implicit thread id */
-        if ( ! pParm->funptr ) {
-            CloseHandle ( pParm->handle );
-        }
+        /* GK 04/2013 - in fact all threads opened with _beginthreadex need their handle closed */
+        CloseHandle ( pParm->handle );
         free ( pParm );
         TlsSetValue ( pGbl->tlsIndexThreadLibraryEPICS, 0 );
     }


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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System