mpm_event: Simplify pollset "good methods" vs APR_POLLSET_WAKEABLE.

* server/mpm/event/event.c(setup_threads_runtime):
  Simplify pollset creation code.

All pollset "good methods" implement APR_POLLSET_WAKEABLE and wake-ability
is quite important for MPM event's correctness anyway so simplify code around
pollset creation so as not to suggest that APR_POLLSET_NODEFAULT if favored
against APR_POLLSET_WAKEABLE.

While at it account for the wakeup pipe in the pollset_size since not all
pollset methods seem to do it internally in APR.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1916925 13f79535-47bb-0310-9956-ffa450edef68

server/mpm/event/event.c

@@ -2630,29 +2630,27 @@ static void setup_threads_runtime(void)
 
     /* Create the main pollset */
     pollset_flags = APR_POLLSET_THREADSAFE | APR_POLLSET_NOCOPY |
-                    APR_POLLSET_NODEFAULT | APR_POLLSET_WAKEABLE;
+                    APR_POLLSET_WAKEABLE | APR_POLLSET_NODEFAULT;
     for (i = 0; i < sizeof(good_methods) / sizeof(good_methods[0]); i++) {
-        rv = apr_pollset_create_ex(&event_pollset, pollset_size, pruntime,
+        rv = apr_pollset_create_ex(&event_pollset, pollset_size + 1, pruntime,
                                    pollset_flags, good_methods[i]);
         if (rv == APR_SUCCESS) {
             listener_is_wakeable = 1;
             break;
         }
     }
-    if (rv != APR_SUCCESS) {
-        pollset_flags &= ~APR_POLLSET_WAKEABLE;
-        for (i = 0; i < sizeof(good_methods) / sizeof(good_methods[0]); i++) {
-            rv = apr_pollset_create_ex(&event_pollset, pollset_size, pruntime,
-                                       pollset_flags, good_methods[i]);
-            if (rv == APR_SUCCESS) {
-                break;
-            }
-        }
-    }
     if (rv != APR_SUCCESS) {
         pollset_flags &= ~APR_POLLSET_NODEFAULT;
-        rv = apr_pollset_create(&event_pollset, pollset_size, pruntime,
+        rv = apr_pollset_create(&event_pollset, pollset_size + 1, pruntime,
                                 pollset_flags);
+        if (rv == APR_SUCCESS) {
+            listener_is_wakeable = 1;
+        }
+        else {
+            pollset_flags &= ~APR_POLLSET_WAKEABLE;
+            rv = apr_pollset_create(&event_pollset, pollset_size, pruntime,
+                                    pollset_flags);
+        }
     }
     if (rv != APR_SUCCESS) {
         ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(03103)