diff --git a/src/libCom/iocsh/osiRegister.c b/src/libCom/iocsh/osiRegister.c
deleted file mode 100644
index 1c2a9b606..000000000
--- a/src/libCom/iocsh/osiRegister.c
+++ /dev/null
@@ -1,145 +0,0 @@
-/*************************************************************************\
-* Copyright (c) 2007 UChicago Argonne LLC, as Operator of Argonne
-*     National Laboratory.
-* Copyright (c) 2002 The Regents of the University of California, as
-*     Operator of Los Alamos National Laboratory.
-* EPICS BASE is distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "iocsh.h"
-#include "epicsThread.h"
-#include "epicsMutex.h"
-#define epicsExportSharedSymbols
-#include "osiRegister.h"
-
-/* epicsThreadShowAll */
-static const iocshArg epicsThreadShowAllArg0 = { "level",iocshArgInt};
-static const iocshArg * const epicsThreadShowAllArgs[1] = {&epicsThreadShowAllArg0};
-static const iocshFuncDef epicsThreadShowAllFuncDef =
-    {"epicsThreadShowAll",1,epicsThreadShowAllArgs};
-static void epicsThreadShowAllCallFunc(const iocshArgBuf *args)
-{
-    epicsThreadShowAll(args[0].ival);
-}
-
-/* thread (thread information) */
-static const iocshArg threadArg0 = { "[-level] [thread ...]", iocshArgArgv};
-static const iocshArg * const threadArgs[1] = { &threadArg0 };
-static const iocshFuncDef threadFuncDef = {"thread",1,threadArgs};
-static void threadCallFunc(const iocshArgBuf *args)
-{
-    int i = 1;
-    int first = 1;
-    int level = 0;
-    const char *cp;
-    epicsThreadId tid;
-    unsigned long ltmp;
-    int argc = args[0].aval.ac;
-    char **argv = args[0].aval.av;
-    char *endp;
-
-    if ((i < argc) && (*(cp = argv[i]) == '-')) {
-        level = atoi (cp + 1);
-        i++;
-    }
-    if (i >= argc) {
-        epicsThreadShowAll (level);
-        return;
-    }
-    for ( ; i < argc ; i++) {
-        cp = argv[i];
-        ltmp = strtoul (cp, &endp, 0);
-        if (*endp) {
-            tid = epicsThreadGetId (cp);
-            if (!tid) {
-                printf ("*** argument %d (%s) is not a valid thread name ***\n", i, cp);
-                continue;
-            }
-        }
-        else {
-            tid = (epicsThreadId)ltmp;
-        }
-        if (first) {
-            epicsThreadShow (0, level);
-            first = 0;
-        }
-        epicsThreadShow (tid, level);
-    }
-}
-
-/* epicsMutexShowAll */
-static const iocshArg epicsMutexShowAllArg0 = { "onlyLocked",iocshArgInt};
-static const iocshArg epicsMutexShowAllArg1 = { "level",iocshArgInt};
-static const iocshArg * const epicsMutexShowAllArgs[2] =
-    {&epicsMutexShowAllArg0,&epicsMutexShowAllArg1};
-static const iocshFuncDef epicsMutexShowAllFuncDef =
-    {"epicsMutexShowAll",1,epicsMutexShowAllArgs};
-static void epicsMutexShowAllCallFunc(const iocshArgBuf *args)
-{
-    epicsMutexShowAll(args[0].ival,args[1].ival);
-}
-
-/* epicsThreadSleep */
-static const iocshArg epicsThreadSleepArg0 = { "seconds",iocshArgDouble};
-static const iocshArg * const epicsThreadSleepArgs[1] = {&epicsThreadSleepArg0};
-static const iocshFuncDef epicsThreadSleepFuncDef =
-    {"epicsThreadSleep",1,epicsThreadSleepArgs};
-static void epicsThreadSleepCallFunc(const iocshArgBuf *args)
-{
-    epicsThreadSleep(args[0].dval);
-}
-
-/* epicsThreadResume */
-static const iocshArg epicsThreadResumeArg0 = { "[thread ...]", iocshArgArgv};
-static const iocshArg * const epicsThreadResumeArgs[1] = { &epicsThreadResumeArg0 };
-static const iocshFuncDef epicsThreadResumeFuncDef = {"epicsThreadResume",1,epicsThreadResumeArgs};
-static void epicsThreadResumeCallFunc(const iocshArgBuf *args)
-{
-    int i;
-    const char *cp;
-    epicsThreadId tid;
-    unsigned long ltmp;
-    char nameBuf[64];
-    int argc = args[0].aval.ac;
-    char **argv = args[0].aval.av;
-    char *endp;
-
-    for (i = 1 ; i < argc ; i++) {
-        cp = argv[i];
-        ltmp = strtoul(cp, &endp, 0);
-        if (*endp) {
-            tid = epicsThreadGetId(cp);
-            if (!tid) {
-                printf("*** argument %d (%s) is not a valid thread name ***\n", i, cp);
-                continue;
-            }
-        }
-        else {
-            tid =(epicsThreadId)ltmp;
-            epicsThreadGetName(tid, nameBuf, sizeof nameBuf);
-            if (nameBuf[0] == '\0') {
-                printf("*** argument %d (%s) is not a valid thread id ***\n", i, cp);
-                continue;
-            }
-
-        }
-        if (!epicsThreadIsSuspended(tid)) {
-            printf("*** Thread %s is not suspended ***\n", cp);
-            continue;
-        }
-        epicsThreadResume(tid);
-    }
-}
-
-void epicsShareAPI osiRegister(void)
-{
-    iocshRegister(&epicsThreadShowAllFuncDef,epicsThreadShowAllCallFunc);
-    iocshRegister(&threadFuncDef, threadCallFunc);
-    iocshRegister(&epicsMutexShowAllFuncDef,epicsMutexShowAllCallFunc);
-    iocshRegister(&epicsThreadSleepFuncDef,epicsThreadSleepCallFunc);
-    iocshRegister(&epicsThreadResumeFuncDef,epicsThreadResumeCallFunc);
-}
diff --git a/src/libCom/iocsh/osiRegister.h b/src/libCom/iocsh/osiRegister.h
deleted file mode 100644
index 3f90b7f12..000000000
--- a/src/libCom/iocsh/osiRegister.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/*************************************************************************\
-* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
-*     National Laboratory.
-* Copyright (c) 2002 The Regents of the University of California, as
-*     Operator of Los Alamos National Laboratory.
-* EPICS BASE Versions 3.13.7
-* and higher are distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-/* osiRegister.h */
-/* Author:  Marty Kraimer Date: 27APR2000 */
-
-#ifndef INCosiRegisterH
-#define INCosiRegisterH
-
-#include "shareLib.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-epicsShareFunc void epicsShareAPI osiRegister(void);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /*INCosiRegisterH*/