diff --git a/src/libCom/timer/epicsTimer.cpp b/src/libCom/timer/epicsTimer.cpp
new file mode 100644
index 000000000..91fa940d1
--- /dev/null
+++ b/src/libCom/timer/epicsTimer.cpp
@@ -0,0 +1,124 @@
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#include <typeinfo>
+
+#define epicsExportSharedSymbols
+#include "epicsTimer.h"
+#if 0
+#include "tsFreeList.h"
+#include "tsDLList.h"
+#include "epicsMutex.h"
+#include "locationException.h"
+#include "errlog.h"
+#endif
+
+epicsTimerQueueNonThreaded::~epicsTimerQueueNonThreaded () {}
+void epicsTimerNotify::show ( unsigned /* level */ ) const {}
+
+#if 0
+class epicsTimerForC : public epicsTimer {
+    epicsShareFunc virtual void expire ();
+    epicsShareFunc virtual void destroy ();
+    epicsShareFunc virtual bool again () const;
+    epicsShareFunc virtual double delay () const;
+    epicsShareFunc virtual void show ( unsigned level ) const;
+    const epicsTimerJumpTable &jt;
+    void * pPrivate;
+public:
+    epicsTimerForC ( const epicsTimerJumpTable &jtIn, epicsTimerQueue &queue, void *pPrivateIn );
+};
+
+epicsTimerForC::epicsTimerForC ( const epicsTimerJumpTable &jtIn, epicsTimerQueue &queue, void *pPrivateIn ) :
+    epicsTimer ( queue ), jt ( jtIn ), pPrivate ( pPrivateIn ) {}
+
+void epicsTimerForC::expire ()
+{
+    ( *this->jt.expire ) ( this->pPrivate );
+}
+
+void epicsTimerForC::destroy ()
+{
+    ( *this->jt.destroy ) ( this->pPrivate );
+}
+
+bool epicsTimerForC::again () const
+{
+    return ( *this->jt.again ) ( this->pPrivate ) ? true : false ;
+}
+
+double epicsTimerForC::delay () const 
+{
+    return ( *this->jt.delay ) ( this->pPrivate );
+}
+
+void epicsTimerForC::show ( unsigned level ) const 
+{
+    ( *this->jt.show ) ( this->pPrivate, level );
+}
+
+extern "C" epicsShareFunc epicsTimerId epicsShareAPI epicsTimerCreate (
+    const epicsTimerJumpTable *pjtIn, epicsTimerQueueId queueIdIn, void *pPrivateIn )
+{
+    assert ( pjtIn );
+    assert ( queueIdIn );
+    return ( epicsTimerId ) new epicsTimerForC 
+        ( *pjtIn, *static_cast < epicsTimerQueue * > ( queueIdIn ), pPrivateIn );
+}
+
+extern "C" epicsShareFunc void epicsShareAPI epicsTimerArm  ( epicsTimerId tmrIdIn, double delay )
+{
+    epicsTimerForC *pTmr = static_cast < epicsTimerForC * > ( tmrIdIn );
+    assert ( pTmr );
+    pTmr->reschedule ( delay );
+}
+
+extern "C" epicsShareFunc void epicsShareAPI epicsTimerCancel ( epicsTimerId tmrIdIn )
+{
+    epicsTimerForC *pTmr = static_cast < epicsTimerForC * > ( tmrIdIn );
+    assert ( pTmr );
+    pTmr->cancel ();
+}
+
+extern "C" epicsShareFunc double epicsShareAPI epicsTimerTimeRemaining ( epicsTimerId idIn )
+{
+    epicsTimerForC *pTmr = static_cast < epicsTimerForC * > ( idIn );
+    assert ( pTmr );
+    return pTmr->timeRemaining ();
+}
+
+extern "C" epicsShareFunc epicsTimeStamp epicsShareAPI epicsTimerExpirationDate ( epicsTimerId idIn )
+{
+    epicsTimerForC *pTmr = static_cast < epicsTimerForC * > ( idIn );
+    assert ( pTmr );
+    return pTmr->expirationDate ();
+}
+
+#endif
\ No newline at end of file
diff --git a/src/libCom/timer/epicsTimerPrivate.h b/src/libCom/timer/epicsTimerPrivate.h
new file mode 100644
index 000000000..ae480edc6
--- /dev/null
+++ b/src/libCom/timer/epicsTimerPrivate.h
@@ -0,0 +1,161 @@
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#ifndef epicsTimerPrivate_h
+#define epicsTimerPrivate_h
+
+#include "tsFreeList.h"
+#include "tsDLList.h"
+#include "epicsTimer.h"
+
+#ifdef DEBUG
+#   define debugPrintf(ARGSINPAREN) printf ARGSINPAREN
+#else
+#   define debugPrintf(ARGSINPAREN)
+#endif
+
+class timer : public epicsTimer, public tsDLNode < timer > {
+public:
+    timer ( epicsTimerNotify &, class timerQueue & );
+    void start ( const epicsTime & );
+    void start ( double delaySeconds );
+    void cancel ();
+    double getExpireDelay () const;
+    void show ( unsigned int level ) const;
+    void * operator new ( size_t size );
+    void operator delete ( void *pCadaver, size_t size );
+    class noMemory {}; // exception
+protected:
+    ~timer ();
+private:
+    enum state { statePending = 45, stateLimbo = 78 };
+    epicsTime exp; // experation time 
+    state curState; // current state 
+    epicsTimerNotify &notify; // callback
+    timerQueue &queue;
+    void privateStart ( const epicsTime & );
+    void privateCancel ();
+    double privateDelayToFirstExpire () const;
+    static tsFreeList < class timer, 0x20 > freeList;
+    friend class timerQueue;
+};
+
+class timerQueueNotify {
+public:
+    virtual void reschedule () = 0;
+};
+
+class timerQueue {
+public:
+    timerQueue ( timerQueueNotify &notify );
+    ~timerQueue ();
+    void process ();
+    double delayToFirstExpire () const;
+    void show ( unsigned int level ) const;
+private:
+    mutable epicsMutex mutex;
+    epicsEvent cancelBlockingEvent;
+    tsDLList < timer > timerList;
+    timerQueueNotify &notify;
+    timer *pExpireTmr;
+    epicsThreadId processThread;
+    bool cancelPending;
+    friend class timer;
+};
+
+class timerQueueThreadedMgrPrivate {
+public:
+    timerQueueThreadedMgrPrivate ();
+protected:
+    virtual ~timerQueueThreadedMgrPrivate () = 0;
+private:
+    unsigned referenceCount;
+    friend class timerQueueThreadedMgr;
+};
+
+class timerQueueThreaded : public epicsTimerQueueThreaded, 
+    public epicsThreadRunable, public timerQueueNotify,
+    public timerQueueThreadedMgrPrivate,
+    public tsDLNode < timerQueueThreaded > {
+public:
+    timerQueueThreaded ( unsigned priority );
+    epicsTimer & createTimer ( epicsTimerNotify & );
+    void show ( unsigned int level ) const;
+    void * operator new ( size_t size );
+    void operator delete ( void *pCadaver, size_t size );
+    void release ();
+    int threadPriority () const;
+protected:
+    ~timerQueueThreaded ();
+private:
+    timerQueue queue;
+    epicsEvent rescheduleEvent;
+    epicsEvent exitEvent;
+    epicsThread thread;
+    bool exitFlag;
+    bool terminateFlag;
+    void run ();
+    void reschedule ();
+    static tsFreeList < class timerQueueThreaded, 0x8 > freeList;
+};
+
+class timerQueueThreadedMgr {
+public:
+    ~timerQueueThreadedMgr ();
+    timerQueueThreaded & create ( bool okToShare, 
+        int threadPriority = epicsThreadPriorityMin + 10 );
+    void release ( timerQueueThreaded & );
+private:
+    epicsMutex mutex;
+    tsDLList < timerQueueThreaded > queueList;
+};
+
+inline void * timer::operator new ( size_t size )
+{
+    return timer::freeList.allocate ( size );
+}
+
+inline void timer::operator delete ( void *pCadaver, size_t size )
+{
+    timer::freeList.release ( pCadaver, size );
+}
+
+inline void * timerQueueThreaded::operator new ( size_t size )
+{
+    return timerQueueThreaded::freeList.allocate ( size );
+}
+
+inline void timerQueueThreaded::operator delete ( void *pCadaver, size_t size )
+{
+    timerQueueThreaded::freeList.release ( pCadaver, size );
+}
+
+#endif // epicsTimerPrivate_h
+
diff --git a/src/libCom/timer/timer.cpp b/src/libCom/timer/timer.cpp
new file mode 100644
index 000000000..f64afd086
--- /dev/null
+++ b/src/libCom/timer/timer.cpp
@@ -0,0 +1,174 @@
+
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#define epicsExportSharedSymbols
+#include "epicsTimerPrivate.h"
+
+tsFreeList < class timer, 0x20 > timer::freeList;
+
+epicsTimer::~epicsTimer () {}
+
+timer::timer ( epicsTimerNotify &notifyIn, timerQueue &queueIn ) :
+    curState ( stateLimbo ), notify ( notifyIn ), queue ( queueIn )
+{
+}
+
+timer::~timer()
+{
+    this->cancel ();
+}
+
+inline double timer::privateDelayToFirstExpire () const
+{
+    if ( this->curState == statePending ) {
+        double delay = this->exp - epicsTime::getCurrent ();
+        if ( delay < 0.0 ) {
+            delay = 0.0;
+        }
+        return delay;
+    }
+    else {
+        return -DBL_MAX;
+    }
+}
+
+void timer::start ( double delaySeconds )
+{
+    this->start ( epicsTime::getCurrent () + delaySeconds );
+}
+
+void timer::start ( const epicsTime & expire )
+{
+    epicsAutoMutex locker ( this->queue.mutex );
+    this->privateStart ( expire );
+}
+
+void timer::privateStart ( const epicsTime & expire )
+{
+    this->privateCancel ();
+
+    this->exp = expire;
+
+#   ifdef DEBUG
+        unsigned preemptCount=0u;
+#   endif
+
+    //
+    // insert into the pending queue
+    //
+    // Finds proper time sorted location using a linear search.
+    //
+    // **** this should use a binary tree ????
+    //
+    tsDLIterBD < timer > pTmr = this->queue.timerList.lastIter ();
+    while ( true ) {
+        if ( ! pTmr.valid () ) {
+            //
+            // add to the beginning of the list
+            //
+            this->queue.timerList.push ( *this );
+            this->queue.notify.reschedule ();
+            break;
+        }
+        if ( pTmr->exp <= this->exp ) {
+            //
+            // add after the item found that expires earlier
+            //
+            this->queue.timerList.insertAfter ( *this, *pTmr );
+            break;
+        }
+#       ifdef DEBUG
+            preemptCount++;
+#       endif
+        --pTmr;
+    }
+
+    this->curState = timer::statePending;
+    
+#   ifdef DEBUG 
+        this->show ( 10u );
+        this->queue.show ( 10u );
+#   endif
+
+    debugPrintf ( ("Arm of \"%s\" with delay %f at %p preempting %u\n", 
+        typeid ( this->notify ).name (), 
+        expire - epicsTime::getCurrent (), 
+        this, preemptCount ) );
+}
+
+void timer::cancel ()
+{
+    {
+        epicsAutoMutex locker ( this->queue.mutex );
+        this->privateCancel ();
+        // dont wait if this was called indirectly by expire ()
+        if ( this->queue.pExpireTmr == this && 
+            this->queue.processThread != epicsThreadGetIdSelf () ) {
+            this->queue.cancelPending = true;
+        }
+    }
+
+    // make certain timer expire() does not run after cancel () returns,
+    // but dont require that lock is applied while calling expire()
+    if ( this->queue.cancelPending ) {
+        while ( this->queue.cancelPending ) {
+            this->queue.cancelBlockingEvent.wait ();
+        }
+        // in case other threads are waiting
+        this->queue.cancelBlockingEvent.signal ();
+    }
+}
+
+void timer::privateCancel ()
+{
+    if ( this->curState == statePending ) {
+        this->queue.timerList.remove ( *this );
+        this->curState = stateLimbo;
+    }
+}
+
+double timer::getExpireDelay () const
+{
+    epicsAutoMutex locker ( this->queue.mutex );
+    return this->privateDelayToFirstExpire ();
+}
+
+void timer::show ( unsigned int level ) const
+{
+    double delay = this->getExpireDelay ();
+    printf ( "%s, state = %s, delay to expire = %g\n", 
+        typeid ( this->notify ).name (), 
+        this->curState == statePending ? "pending" : "limbo",
+        delay );
+    if ( level >= 1u ) {
+        this->notify.show ( level - 1u );
+    }
+}
diff --git a/src/libCom/timer/timerQueue.cpp b/src/libCom/timer/timerQueue.cpp
new file mode 100644
index 000000000..39cd665f1
--- /dev/null
+++ b/src/libCom/timer/timerQueue.cpp
@@ -0,0 +1,159 @@
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#define epicsExportSharedSymbols
+#include "epicsTimerPrivate.h"
+
+timerQueue::timerQueue ( timerQueueNotify &notifyIn ) :
+    notify ( notifyIn ), pExpireTmr ( 0 ),  
+        processThread ( 0 ), cancelPending ( false )
+{
+}
+
+timerQueue::~timerQueue ()
+{
+    timer *pTmr;
+    this->mutex.lock ();
+    while ( ( pTmr = this->timerList.get () ) ) {    
+        pTmr->curState = timer::stateLimbo;
+    }
+}
+
+double timerQueue::delayToFirstExpire () const
+{
+    epicsAutoMutex locker ( this->mutex );
+    timer *pTmr = this->timerList.first ();
+    if ( pTmr ) {
+        return pTmr->privateDelayToFirstExpire ();
+    }
+    else {
+        return DBL_MAX;
+    }
+}
+
+void timerQueue::process ()
+{
+    epicsTime cur ( epicsTime::getCurrent () );
+  
+    {
+        epicsAutoMutex locker ( this->mutex );
+
+        if ( this->pExpireTmr ) {
+            // if some other thread is processing the queue
+            // (or if this is a recursive call)
+            return; 
+        }
+
+        this->pExpireTmr = this->timerList.get ();
+        if ( ! this->pExpireTmr ) {
+            return;
+        }
+        if ( cur > this->pExpireTmr->exp ) {
+
+            //
+            // Tag current epired tmr so that we can detect if call back
+            // is in progress when canceling the timer.
+            //
+#           ifdef DEBUG
+                this->pExpireTmr->show ( 0u );
+#           endif 
+            this->pExpireTmr->curState = timer::stateLimbo;
+            this->processThread = epicsThreadGetIdSelf ();
+        }
+        else {
+            // no activity
+            debugPrintf ( ( "no activity process\n" ) );
+            this->timerList.push ( *this->pExpireTmr );
+            this->pExpireTmr = 0;
+            return;
+        }
+    }
+
+#   ifdef DEBUG
+        unsigned N = 0u;
+#   endif
+
+    while ( true ) {
+ 
+        debugPrintf ( ( "%5u expired \"%s\" with error %f sec\n", 
+            N++, typeid ( this->pExpireTmr->notify ).name (), 
+            cur - this->pExpireTmr->exp ) );
+
+        epicsTimerNotify::expireStatus expStat = this->pExpireTmr->notify.expire ();
+
+        epicsAutoMutex locker ( this->mutex );
+
+        //
+        // only restart if they didnt cancel() the timer
+        // while the call back was running
+        //
+        if ( this->cancelPending ) {
+            // cancel () waits for this
+            this->cancelPending = false;
+            this->cancelBlockingEvent.signal ();
+        }
+        // restart as nec
+        else if ( expStat.restart () ) {
+            this->pExpireTmr->privateStart ( cur + expStat.expirationDelay () );
+        }
+
+        this->pExpireTmr = this->timerList.get ();
+        if ( ! this->pExpireTmr ) {
+            this->processThread = 0;
+            return;
+        }
+        if ( cur > this->pExpireTmr->exp ) {
+#           ifdef DEBUG
+                this->pExpireTmr->show ( 0u );
+#           endif 
+            this->pExpireTmr->curState = timer::stateLimbo;
+        }
+        else {
+            // no activity
+            this->timerList.push ( *this->pExpireTmr );
+            this->pExpireTmr = 0;
+            this->processThread = 0;
+            return;
+        }
+    }
+}
+
+void timerQueue::show ( unsigned level ) const
+{
+    epicsAutoMutex locker ( this->mutex );
+    printf ( "epicsTimerQueue with %u items pending\n", this->timerList.count () );
+    if ( level >= 1u ) {
+        tsDLIterConstBD < timer > iter = this->timerList.firstIter ();
+        while ( iter.valid () ) {   
+            iter->show ( level - 1u );
+            ++iter;
+        }
+    }
+}
diff --git a/src/libCom/timer/timerQueueThreaded.cpp b/src/libCom/timer/timerQueueThreaded.cpp
new file mode 100644
index 000000000..5318a5271
--- /dev/null
+++ b/src/libCom/timer/timerQueueThreaded.cpp
@@ -0,0 +1,118 @@
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#define epicsExportSharedSymbols
+#include "epicsTimerPrivate.h"
+
+static timerQueueThreadedMgr queueMgr;
+
+epicsTimerQueueThreaded::~epicsTimerQueueThreaded () {}
+
+epicsTimerQueueThreaded &epicsTimerQueueThreaded::create ( bool okToShare, int threadPriority )
+{
+    return queueMgr.create ( okToShare, threadPriority );
+}
+
+tsFreeList < class timerQueueThreaded, 0x8 > timerQueueThreaded::freeList;
+
+timerQueueThreaded::timerQueueThreaded ( unsigned priority ) :
+    thread ( *this, "epicsTimerQueue",
+        epicsThreadGetStackSize ( epicsThreadStackMedium ), priority ),
+    queue ( *this ), exitFlag ( false ), terminateFlag ( false )
+{
+    this->thread.start ();
+}
+
+timerQueueThreaded::~timerQueueThreaded ()
+{
+    this->terminateFlag = true;
+    this->rescheduleEvent.signal ();
+    while ( ! this->exitFlag && ! this->thread.isSuspended () ) {
+        this->exitEvent.wait ( 1.0 );
+    }
+    // in case other threads are waiting here also
+    this->exitEvent.signal ();
+}
+
+int timerQueueThreaded::threadPriority () const
+{
+    return thread.getPriority ();
+}
+
+void timerQueueThreaded::release ()
+{
+    queueMgr.release ( *this );
+}
+
+void timerQueueThreaded::run ()
+{
+    this->exitFlag = false;
+    while ( ! this->terminateFlag ) {
+        double delay = this->queue.delayToFirstExpire ();
+        if ( delay <= 0.0 ) {
+            this->queue.process ();
+        }
+        else {
+            debugPrintf ( ( "timer thread sleeping for %g sec (max)\n", delay ) );
+            this->rescheduleEvent.wait ( delay );
+        }
+    }
+    this->exitFlag = true; 
+    this->exitEvent.signal (); // no access to queue after exitEvent signal
+}
+
+epicsTimer & timerQueueThreaded::createTimer ( epicsTimerNotify & notify )
+{
+    timer *pTmr = new timer ( notify, this->queue );
+    if ( ! pTmr ) {
+        throwWithLocation ( timer::noMemory () );
+    }
+    return *pTmr;
+}
+
+void timerQueueThreaded::reschedule ()
+{
+    this->rescheduleEvent.signal ();
+}
+
+void timerQueueThreaded::show ( unsigned int level ) const
+{
+    printf ( "EPICS threaded timer queue at %p\n", this );
+    if ( level >=1u ) {
+        this->queue.show ( level - 1u );
+        printf ( "reschedule event\n" );
+        this->rescheduleEvent.show ( level - 1u );
+        printf ( "exit event\n" );
+        this->exitEvent.show ( level - 1u );
+        printf ( "exitFlag = %c, terminateFlag = %c\n",
+            this->exitFlag ? 'T' : 'F',
+            this->terminateFlag ? 'T' : 'F' );
+    }
+}
diff --git a/src/libCom/timer/timerQueueThreadedMgr.cpp b/src/libCom/timer/timerQueueThreadedMgr.cpp
new file mode 100644
index 000000000..edc759282
--- /dev/null
+++ b/src/libCom/timer/timerQueueThreadedMgr.cpp
@@ -0,0 +1,85 @@
+/*
+ *      $Id$
+ *
+ *      Author  Jeffrey O. Hill
+ *              johill@lanl.gov
+ *              505 665 1831
+ *
+ *      Experimental Physics and Industrial Control System (EPICS)
+ *
+ *      Copyright 1991, the Regents of the University of California,
+ *      and the University of Chicago Board of Governors.
+ *
+ *      This software was produced under  U.S. Government contracts:
+ *      (W-7405-ENG-36) at the Los Alamos National Laboratory,
+ *      and (W-31-109-ENG-38) at Argonne National Laboratory.
+ *
+ *      Initial development by:
+ *              The Controls and Automation Group (AT-8)
+ *              Ground Test Accelerator
+ *              Accelerator Technology Division
+ *              Los Alamos National Laboratory
+ *
+ *      Co-developed with
+ *              The Controls and Computing Group
+ *              Accelerator Systems Division
+ *              Advanced Photon Source
+ *              Argonne National Laboratory
+ *
+ */
+
+#include <limits.h>
+
+#define epicsExportSharedSymbols
+#include "epicsTimerPrivate.h"
+
+timerQueueThreadedMgr::~timerQueueThreadedMgr ()
+{
+    epicsAutoMutex locker ( this->mutex );
+    while ( timerQueueThreaded * pQ = this->queueList.get () ) {
+        timerQueueThreadedMgrPrivate *pPriv = pQ;
+        delete pPriv;
+    }
+}
+    
+timerQueueThreaded & timerQueueThreadedMgr::create (
+        bool okToShare, int threadPriority )
+{
+    epicsAutoMutex locker ( this->mutex );
+    tsDLIterBD < timerQueueThreaded > iter = this->queueList.firstIter ();
+    while ( iter.valid () ) {
+        if ( iter->threadPriority () == threadPriority ) {
+            assert ( iter->timerQueueThreadedMgrPrivate::referenceCount < UINT_MAX );
+            iter->timerQueueThreadedMgrPrivate::referenceCount++;
+            return *iter;
+        }
+    }
+    timerQueueThreaded *pQueue = new timerQueueThreaded ( threadPriority );
+    if ( ! pQueue ) {
+        throwWithLocation ( timer::noMemory () );
+    }
+    pQueue->timerQueueThreadedMgrPrivate::referenceCount = 1u;
+    this->queueList.add ( *pQueue );
+    return *pQueue;
+}
+
+void timerQueueThreadedMgr::release ( timerQueueThreaded &queue )
+{
+    epicsAutoMutex locker ( this->mutex );
+    assert ( queue.timerQueueThreadedMgrPrivate::referenceCount > 0u );
+    queue.timerQueueThreadedMgrPrivate::referenceCount--;
+    if ( queue.timerQueueThreadedMgrPrivate::referenceCount == 0u ) {
+        this->queueList.remove ( queue );
+        timerQueueThreadedMgrPrivate *pPriv = &queue;
+        delete pPriv;
+    }
+}
+
+timerQueueThreadedMgrPrivate::timerQueueThreadedMgrPrivate () :
+    referenceCount ( 0u )
+{
+}
+
+timerQueueThreadedMgrPrivate::~timerQueueThreadedMgrPrivate () 
+{
+}
\ No newline at end of file