diff --git a/04_day.pptx b/04_day.pptx
index 8c66017..726f2fa 100644
Binary files a/04_day.pptx and b/04_day.pptx differ
diff --git a/04_day/ashmem_1/Android.bp b/04_day/ashmem_1/Android.bp
new file mode 100644
index 0000000..2262c3f
--- /dev/null
+++ b/04_day/ashmem_1/Android.bp
@@ -0,0 +1,15 @@
+cc_binary {
+    name: "my_server_ashmem",
+    shared_libs: ["liblog", "libutils", "libbinder"],
+    srcs: [
+        "my_server.cpp",
+    ],
+}
+
+cc_binary {
+    name: "my_client_ashmem",
+    shared_libs: ["liblog", "libutils", "libbinder"],
+    srcs: [
+        "my_client.cpp",
+    ],
+}
diff --git a/04_day/ashmem_1/my_client.cpp b/04_day/ashmem_1/my_client.cpp
new file mode 100644
index 0000000..ae34d09
--- /dev/null
+++ b/04_day/ashmem_1/my_client.cpp
@@ -0,0 +1,23 @@
+
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <binder/Binder.h>
+#include <binder/IMemory.h>
+#include <utils/String16.h>
+
+using namespace android;
+
+int main()
+{
+	sp<ProcessState> proc(ProcessState::self());
+	sp<IServiceManager> sm(defaultServiceManager());
+	sp<IBinder> binder = sm->getService( String16("ashmem.service") );
+	sp<IMemoryHeap> ashmem = interface_cast<IMemoryHeap>( binder );
+	char *p = (char*)ashmem->getBase();
+	printf("%s\n", p );
+
+	return 0;
+}
+
+
+
diff --git a/04_day/ashmem_1/my_server.cpp b/04_day/ashmem_1/my_server.cpp
new file mode 100644
index 0000000..ae348ec
--- /dev/null
+++ b/04_day/ashmem_1/my_server.cpp
@@ -0,0 +1,27 @@
+
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <binder/Binder.h>
+#include <binder/IPCThreadState.h>
+#include <utils/String16.h>
+#include <binder/MemoryHeapBase.h>
+#include <string.h>
+
+using namespace android;
+
+int main()
+{
+	sp<ProcessState> proc(ProcessState::self());
+	sp<IServiceManager> sm(defaultServiceManager());
+	sp<IMemoryHeap> heap = new MemoryHeapBase(4096);
+	sm->addService( String16("ashmem.service"), heap->asBinder(heap) );
+	char *p;
+	p = (char*)heap->base();
+	strcpy( p, "Hello Android!!");
+	IPCThreadState::self()->joinThreadPool();
+
+	return 0;
+}
+
+
+
diff --git a/04_day/ashmem_2/Android.bp b/04_day/ashmem_2/Android.bp
new file mode 100644
index 0000000..f0e1f96
--- /dev/null
+++ b/04_day/ashmem_2/Android.bp
@@ -0,0 +1,15 @@
+cc_binary {
+    name: "my_server_ashmem_1",
+    shared_libs: ["liblog", "libutils", "libbinder"],
+    srcs: [
+        "my_server.cpp",
+    ],
+}
+
+cc_binary {
+    name: "my_client_ashmem_1",
+    shared_libs: ["liblog", "libutils", "libbinder"],
+    srcs: [
+        "my_client.cpp",
+    ],
+}
diff --git a/04_day/ashmem_2/my_client.cpp b/04_day/ashmem_2/my_client.cpp
new file mode 100644
index 0000000..b008e05
--- /dev/null
+++ b/04_day/ashmem_2/my_client.cpp
@@ -0,0 +1,26 @@
+
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <binder/Binder.h>
+#include <binder/IMemory.h>
+#include <utils/String16.h>
+
+using namespace android;
+
+int main()
+{
+	sp<ProcessState> proc(ProcessState::self());
+	sp<IServiceManager> sm(defaultServiceManager());
+	sp<IBinder> binder = sm->getService( String16("ashmem.service") );
+	sp<IMemory> base = interface_cast<IMemory>( binder );
+	ssize_t offset=0; 
+	size_t size=0;
+	sp<IMemoryHeap> heap = base->getMemory(&offset, &size);
+	char *p = (char*)heap->getBase();
+	printf("%s\n", p+offset );
+
+	return 0;
+}
+
+
+
diff --git a/04_day/ashmem_2/my_server.cpp b/04_day/ashmem_2/my_server.cpp
new file mode 100644
index 0000000..4ab7658
--- /dev/null
+++ b/04_day/ashmem_2/my_server.cpp
@@ -0,0 +1,29 @@
+
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <binder/Binder.h>
+#include <binder/IPCThreadState.h>
+#include <utils/String16.h>
+#include <binder/MemoryHeapBase.h>
+#include <binder/MemoryBase.h>
+#include <string.h>
+
+using namespace android;
+
+int main()
+{
+	sp<ProcessState> proc(ProcessState::self());
+	sp<IServiceManager> sm(defaultServiceManager());
+	sp<IMemoryHeap> heap = new MemoryHeapBase(4096);
+	sp<IMemory> base = new MemoryBase( heap, 1024*3, 1024);
+	sm->addService( String16("ashmem.service"), base->asBinder(base) );
+	char *p;
+	p = (char*)heap->base();
+	strcpy( p + 3*1024, "Hello Android!!");
+	IPCThreadState::self()->joinThreadPool();
+
+	return 0;
+}
+
+
+