More examples and tweaks

* Signal dispatch() method now uses own pid as default value
* SharedData now updates checksum cache on set()

examples/signals.php

@@ -0,0 +1,29 @@
+<?php
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Ipc\Signal\SignalHandler;
+use NoccyLabs\Ipc\Signal\Signal;
+
+
+$handler = new SignalHandler(SIGUSR1);
+
+// Add handlers like this, or as an array passed as the second argument to the constructor
+$handler->addHandler(function () {
+    echo "First handler\n";
+});
+// If a handler returns true, it will prevent any further handlers from firing
+$handler->addHandler(function () {
+    echo "Second and final handler\n";
+    return true;
+});
+// Thus, this one will not be called
+$handler->addHandler(function() {
+    echo "Third handler, never called\n";
+});
+
+// Dispatch the signal to ourselves
+(new Signal(SIGUSR1))->dispatch(posix_getpid());
+// Default target of dispatch is the own pid
+(new Signal(SIGUSR1))->dispatch();
+