add dispatchSignal method

README.md

@@ -73,7 +73,10 @@ count is less then N+1 forever.
 
 Notice
 --------------------------
-+ Remember that you must add `declare(ticks=n);` at the start of program.
++ Remember that you should call the `Process::dispatchSignal` method to call
+call signal handlers for pending signals.
++ It is not recommend that adding `declare(ticks=n);` at the start of program
+to handle the pending signals.
 + A better way to handle the single is that calling `pcntl_signal_dispatch` 
 instead of `declare` which is more is a waste of CPU resources
 + If the sub processes exit continually and quickly, you should set `n` to 

composer.json

@@ -1,7 +1,7 @@
 {
   "name": "jenner/simple_fork",
   "description": "simple multi process manager based on pcntl",
-  "version": "1.1.3",
+  "version": "1.2.0",
   "keywords": [
     "fork",
     "process manager",

src/Process.php

@@ -352,6 +352,17 @@ public function registerSignalHandler($signal, callable $handler)
         $this->signal_handlers[$signal] = $handler;
     }
 
+    /**
+     * after php-5.3.0, we can call pcntl_singal_dispatch to call signal handlers for pending signals
+     * which can save cpu resources than using declare(tick=n)
+     *
+     * @return bool
+     */
+    public function dispatchSignal()
+    {
+        return pcntl_signal_dispatch();
+    }
+
     /**
      * you should overwrite this function
      * if you do not use the Runnable or callback.