Fix #990 : add check on posix support for pcntl

lib/classes/task/Scheduler.class.php

@@ -65,10 +65,9 @@ class task_Scheduler
             $nullfile = 'NUL';
         }
 
-        if (function_exists('pcntl_fork')) {
+        if (\task_manager::isPosixPcntlSupported()) {
             // avoid <defunct> php when a task ends
             pcntl_signal(SIGCHLD, SIG_IGN);
-
             $this->method = self::METHOD_FORK;
         }
 

lib/classes/task/manager.class.php

@@ -193,6 +193,16 @@ class task_manager
         return $ret;
     }
 
+    /**
+     * Returns true if Pcntl posix supported is enabled, false otherwise
+     *
+     * @return Boolean
+     */
+    public static function isPosixPcntlSupported()
+    {
+        return extension_loaded('pcntl') && extension_loaded('posix');
+    }
+
     public static function getAvailableTasks()
     {
         $taskdir = array(