removed atexit handler that calls epicsThreadExit because:

o recursive exit call is bad
o this causes shutdown problems with DLL codes on windows
=> the workaround is an atexit handler that calls epicsExitCallAtExits in
the poosix osdThreads atexit handler

src/libCom/misc/epicsExit.c

@@ -14,11 +14,11 @@
 #include <stdlib.h>
 #include <errno.h>
 
+#define epicsExportSharedSymbols
 #include "ellLib.h"
 #include "epicsThread.h"
 #include "epicsMutex.h"
 #include "cantProceed.h"
-#define epicsExportSharedSymbols
 #include "epicsExit.h"
 
 typedef void (*epicsExitFunc)(void *arg);
@@ -38,13 +38,10 @@ static exitPvt exitPvtInstance;
 static exitPvt *pexitPvt = &exitPvtInstance;
 static epicsThreadOnceId createOnce = EPICS_THREAD_ONCE_INIT;
 
-static void atExit(void) {epicsExit(0);}
-
 static void createExitPvt(void)
 {
     pexitPvt->lock = epicsMutexMustCreate();
     ellInit(&pexitPvt->list);
-    atexit(atExit);
 }
 
 epicsShareFunc void epicsShareAPI epicsExitCallAtExits(void)

src/libCom/osi/os/posix/osdThread.c

@@ -33,6 +33,7 @@
 #include "cantProceed.h"
 #include "errlog.h"
 #include "epicsAssert.h"
+#include "epicsExit.h"
 
 /* Until these can be demonstrated to work leave them undefined*/
 #undef _POSIX_THREAD_ATTR_STACKSIZE
@@ -106,6 +107,7 @@ static void myAtExit(void)
         fprintf(stderr,"osdThread myAtExit extered multiple times\n");
         return;
     }
+    epicsExitCallAtExits();
     status = pthread_mutex_lock(&listLock);
     checkStatusQuit(status,"pthread_mutex_lock","myAtExit");
     pthreadSelf = (epicsThreadOSD *)pthread_getspecific(getpthreadInfo);