diff --git a/03_day.pptx b/03_day.pptx
index 790262a..2def9ae 100644
Binary files a/03_day.pptx and b/03_day.pptx differ
diff --git a/03_day/binder_3/Android.bp b/03_day/binder_3/Android.bp
new file mode 100644
index 0000000..a44bf50
--- /dev/null
+++ b/03_day/binder_3/Android.bp
@@ -0,0 +1,7 @@
+cc_binary {
+    name: "my_server_cpp_1",
+    shared_libs: ["liblog", "libutils", "libbinder"],
+    srcs: [
+        "my_server.cpp",
+    ],
+}
diff --git a/03_day/binder_3/ProcessState.cpp b/03_day/binder_3/ProcessState.cpp
new file mode 100644
index 0000000..07b6867
--- /dev/null
+++ b/03_day/binder_3/ProcessState.cpp
@@ -0,0 +1,54 @@
+#if 1
+#include <stdio.h>
+class ProcessState
+{
+	static ProcessState *gProcess;
+	ProcessState()
+	{
+		printf("fd=open(\"/dev/binder\", O_RDWR)\n");
+	}
+	public:
+	static ProcessState *self()
+	{
+		if( gProcess == 0 )
+			gProcess = new ProcessState;
+		return gProcess;
+	}
+	~ProcessState()
+	{
+		printf("close(fd)\n");
+	}
+};
+ProcessState *ProcessState::gProcess = 0;
+
+int main()
+{
+	ProcessState *p1 = ProcessState::self();
+	ProcessState *p2 = ProcessState::self();
+	//ProcessState process; 
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+class ProcessState
+{
+	public:
+		ProcessState()
+		{
+			printf("fd=open(\"/dev/binder\", O_RDWR)\n");
+		}
+		~ProcessState()
+		{
+			printf("close(fd)\n");
+		}
+};
+
+int main()
+{
+	ProcessState p1;
+	ProcessState p2;
+	return 0;
+}
+#endif
diff --git a/03_day/binder_3/my_server.cpp b/03_day/binder_3/my_server.cpp
new file mode 100644
index 0000000..26c61af
--- /dev/null
+++ b/03_day/binder_3/my_server.cpp
@@ -0,0 +1,21 @@
+
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <binder/Binder.h>
+#include <binder/IPCThreadState.h>
+#include <utils/String16.h>
+
+using namespace android;
+
+int main()
+{
+	sp<ProcessState> proc(ProcessState::self());
+	sp<IServiceManager> sm(defaultServiceManager());
+	sm->addService( String16("led.service"), new BBinder );
+	IPCThreadState::self()->joinThreadPool();
+
+	return 0;
+}
+
+
+