--- vdr-vanilla/thread.c	2003-10-10 18:19:15.000000000 +0200
+++ vdr-vanilla-thread/thread.c	2003-10-10 18:43:36.000000000 +0200
@@ -158,12 +158,21 @@
 
 bool cThread::Active(void)
 {
-  if (threadPid) {
-     if (kill(threadPid, SIGIO) < 0) { // couldn't find another way of checking whether the thread is still running - any ideas?
-        if (errno == ESRCH)
-           threadPid = 0;
-        else
+  if (thread) {
+     /*
+      * Single UNIX Spec v2 says:
+      *
+      * The pthread_kill() function is used to request
+      * that a signal be delivered to the specified thread.
+      *
+      * As in kill(), if sig is zero, error checking is
+      * performed but no signal is actually sent.
+      */
+     int err;
+     if ((err = pthread_kill(thread, 0)) != 0) {
+        if (err != ESRCH)
            LOG_ERROR;
+        thread = 0;
         }
      else
         return true;