Fix a mod_ssl build problem on OS/390.

This is admittedly rather ugly code to come up with a unique 4-byte
identifier for the thread.  Since our threads are pthreads and a pthread
maps 1:1 to a TCB, the address of the TCB is sufficient.   Yes, every
TCB sees a different piece of real storage mapped to the first page,
so the code does make sense.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95016 13f79535-47bb-0310-9956-ffa450edef68

CHANGES

@@ -1,5 +1,7 @@
 Changes with Apache 2.0.37
 
+  *) Fix a mod_ssl build problem on OS/390.  [Jeff Trawick]
+
   *) Fixed If-Modified-Since on Win32, which would give false positives
      because of the sub-second resolution of file timestamps on that
      platform.  [Cliff Woolley]

modules/ssl/ssl_util.c

@@ -419,7 +419,20 @@ static void ssl_util_thr_lock(int mode, int type,
 
 static unsigned long ssl_util_thr_id(void)
 {
+    /* OpenSSL needs this to return an unsigned long.  On OS/390, the pthread 
+     * id is a structure twice that big.  Use the TCB pointer instead as a 
+     * unique unsigned long.
+     */
+#ifdef __MVS__
+    struct PSA {
+        char unmapped[540];
+        unsigned long PSATOLD;
+    } *psaptr = 0;
+
+    return psaptr->PSATOLD;
+#else
     return (unsigned long) apr_os_thread_current();
+#endif
 }
 
 static apr_status_t ssl_util_thread_cleanup(void *data)