Experimental Physics and
Industrial Control System

Margaret Votava <[email protected]> · Fri, 10 Mar 2006 14:20:59 -0600

Hi Jeff,
FYI, things that I didn't include yesterday.
a) I did set a break point in
void ca_client_context::installDefaultService ( cacService & service )

which was never called. I don't know if it should have been, but

it was a section that was changed with your patch.
b) i've attached a patch file on what we did to kludge the
problem. Note that TRACE is an inhouse debugging tool
so we could have more diagnostic information.
Thanks a lot,
Margaret
Margaret Votava wrote:

Hi Jeff,
I apologize profusely for a less than timely reply. My interrupt queue
was deep and we were running with a workaround.
I tried the patch today and it didn't help. See trace below. I promise
to be faster in the future.
Thanks a lot,
Margaret

Starting program:
/home/votava/smtf/doocs/clients/rpc_util/Linux/bin/rpc_util

Breakpoint 2 at 0xdca2b5: file ../ca_client_context.cpp, line 736.

Breakpoint 3 at 0xdc7421: file ../ca_client_context.cpp, line 55.

[Thread debugging using libthread_db enabled]

[New Thread -1208031008 (LWP 27375)]

[Switching to Thread -1208031008 (LWP 27375)]
Breakpoint 3, cacOnceFunc () at ../ca_client_context.cpp:55

55 caClientCallbackThreadId = epicsThreadPrivateCreate ();

(gdb) n

56 assert ( caClientCallbackThreadId );

(gdb) n

55 caClientCallbackThreadId = epicsThreadPrivateCreate ();

(gdb) n

56 assert ( caClientCallbackThreadId );

(gdb) n

57 ca_client_context::pDefaultServiceInstallMutex = new
epicsMutex;

(gdb) n

58 epicsAtExit ( cacExitHandler,0 );

(gdb) n

57 ca_client_context::pDefaultServiceInstallMutex = new
epicsMutex;

(gdb) c

Continuing.
Program received signal SIGSEGV, Segmentation fault.

epicsMutex::lock (this=0x0) at ../../../src/libCom/osi/epicsMutex.cpp:118

118 epicsMutexOsdLock(pmutexNode->id);

(gdb) where

#0 epicsMutex::lock (this=0x0) at
../../../src/libCom/osi/epicsMutex.cpp:118

#1 0x00df37d1 in ipAddrToAsciiEngine::allocate () at
../../../src/libCom/cxxTemplates/epicsGuard.h:68

#2 0x00dd02ef in cac (this=0x99e28a8, mutualExclusionIn=@0x0,
callbackControlIn=@0x99e26e4, notifyIn=@0x0) at ../cac.cpp:144

#3 0x00dc943d in ca_client_context (this=0x99e2670,
enablePreemptiveCallback=false) at ../../../include/epicsMemory.h:110

#4 0x00dc638a in ca_context_create
(premptiveCallbackSelect=ca_disable_preemptive_callback) at
../access.cpp:204

#5 0x00dc63d5 in ca_task_initialize () at ../access.cpp:180

#6 0x00db8e19 in epics_init () at
/home/votava/smtf/doocs/libs/clientlib/source/clientlib/eq_svr.cc:1928

#7 0x00dc08d9 in EqCall (this=0x99e2490) at
/home/votava/smtf/doocs/libs/clientlib/source/clientlib/eq_client.cc:369

#8 0x00ff8057 in __static_initialization_and_destruction_0
(__initialize_p=1, __priority=65535)

at
/home/votava/smtf/doocs/libs/dddlib/source/dddlib/panels/device_attr_stubs.cc:26 
#9 0x00ff8137 in global constructors keyed to ea () at
/home/votava/smtf/doocs/libs/dddlib/source/dddlib/panels/device_attr_stubs.cc:400 
#10 0x01029329 in __do_global_ctors_aux () from
/home/votava/smtf/doocs/ups/../ups/../libs/dddlib/ups/../ups/../Linux/lib/libddd.so.2.2.6 
#11 0x00f37d7d in _init () from
/home/votava/smtf/doocs/ups/../ups/../libs/dddlib/ups/../ups/../Linux/lib/libddd.so.2.2.6 
#12 0x00271318 in _dl_init_internal () from /lib/ld-linux.so.2
#13 0x002657ff in _dl_start_user () from /lib/ld-linux.so.2
(gdb)

Index: epicsMutex.cpp
===================================================================
RCS file: /cvs/smtfcvs/epics/epics_base/src/libCom/osi/epicsMutex.cpp,v
retrieving revision 1.2
diff -u -w -b -i -r1.2 epicsMutex.cpp

--- epicsMutex.cpp	17 Feb 2006 17:52:15 -0000	1.2
+++ epicsMutex.cpp	10 Mar 2006 20:17:31 -0000
@@ -24,20 +24,6 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-extern "C" {
-/*  standard TRACE include directives */
-#if defined(linux) || defined(__linux__)
-# include <linux/config.h>
-#endif
-#if defined(CONFIG_TRACE)
-# define TRACE_NAME "doocs"
-# include <linux/trace.h>	/* TRACE */
-#else
-# include <sys/time.h>		/* struct timeval */
-# define TRACE(args...)		({struct timeval __tv__={0}; __tv__;})
-# define TRACE_CNTL(args...)	({register int x=0;x;})
-#endif
-}
 
 #define epicsExportSharedSymbols
 #include "epicsStdioRedirect.h"
@@ -69,7 +55,6 @@
     const char *pFileName,int lineno)
 {
     epicsMutexOSD * id;
-    TRACE( 5, "epicsMutexOsiCreate %d=lineno", lineno );
 
     if(firstTime) {
         firstTime=0;
@@ -129,7 +114,6 @@
 epicsMutexLockStatus epicsShareAPI epicsMutexLock(
     epicsMutexId pmutexNode)
 {
-    TRACE( 5, "epicsMutex pmutexNode=%p", pmutexNode );
     epicsMutexLockStatus status = 
         epicsMutexOsdLock(pmutexNode->id);
 #   ifdef LOG_LAST_OWNER
@@ -212,7 +196,6 @@
 epicsMutex :: epicsMutex () :
     id ( epicsMutexCreate () )
 {
-    TRACE( 5, "epicsMutex constructr %p=this %p=id<-this", this, this->id );
     if ( this->id == 0 ) {
         throw mutexCreateFailed ();
     }
@@ -225,11 +208,6 @@
 
 void epicsMutex::lock ()
 {
-    TRACE( 5, "epicMutex::lock %p=this %p=this->id", this, this?this->id:NULL );
-    if (this->id == 0)
-    {   this->id = epicsMutexCreate();
-	TRACE( 5, "epicMutex::lock now %p=this %p=this->id", this, this?this->id:NULL );
-    }
     epicsMutexLockStatus status = epicsMutexLock ( this->id );
     if ( status != epicsMutexLockOK ) {
         throw invalidMutex ();


Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System