diff --git a/04_day.pptx b/04_day.pptx
index 2788fad..8c66017 100644
Binary files a/04_day.pptx and b/04_day.pptx differ
diff --git a/04_day/thread/Android.bp b/04_day/thread/Android.bp
index cebd80a..beefc4c 100644
--- a/04_day/thread/Android.bp
+++ b/04_day/thread/Android.bp
@@ -1,8 +1,8 @@
 cc_binary {
-    name: "my_thread_1",
+    name: "my_ipc",
     shared_libs: ["liblog", "libutils", "libbinder"],
     srcs: [
-        "Thread.cpp",
+        "IPCThreadState.cpp",
     ],
 }
 
diff --git a/04_day/thread/IPCThreadState.cpp b/04_day/thread/IPCThreadState.cpp
new file mode 100644
index 0000000..ddc9316
--- /dev/null
+++ b/04_day/thread/IPCThreadState.cpp
@@ -0,0 +1,40 @@
+#if 1
+#include <stdio.h>
+#include <utils/Thread.h>
+#include <utils/StrongPointer.h>
+#include <binder/IPCThreadState.h>
+
+using namespace android;
+//--------------------------------------------------------
+
+class MyThread : public Thread
+{
+	public:
+		bool threadLoop()
+		{
+			IPCThreadState *ipc1 = IPCThreadState::self();
+			IPCThreadState *ipc2 = IPCThreadState::self();
+			printf("ipc1=%p\n", ipc1 );
+			printf("ipc2=%p\n", ipc2 );
+			return false;
+		}
+};
+int main()
+{
+	sp<Thread> thread1 = new MyThread;
+	sp<Thread> thread2 = new MyThread;
+	thread1->run("MyThread1");
+	thread2->run("MyThread2");
+	thread1->join();
+	thread2->join();
+
+	return 0;
+}
+#endif
+
+
+
+
+
+
+
diff --git a/04_day/thread/a.out b/04_day/thread/a.out
index 22bb185..ad2461d 100644
Binary files a/04_day/thread/a.out and b/04_day/thread/a.out differ
diff --git a/04_day/thread/tls.cpp b/04_day/thread/tls.cpp
new file mode 100644
index 0000000..d6c94ac
--- /dev/null
+++ b/04_day/thread/tls.cpp
@@ -0,0 +1,200 @@
+#if 1
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+
+pthread_key_t key;
+
+void foo(void)
+{
+	int *count = (int *)pthread_getspecific(key);
+	if( count == 0 )
+	{
+		count = new int(0);
+		printf("count=%p\n", count);
+		pthread_setspecific(key, count);
+	}
+	printf("foo() : %d\n", ++*count ); 
+}
+//-------------------------------------------------------
+void *handler_1(void *data)
+{
+	foo();
+	foo();
+	foo();
+	return 0;
+}
+
+void *handler_2(void *data)
+{
+	foo();
+	foo();
+	return 0;
+}
+void my_destructor(void* p)
+{
+	printf("my_destructor(%p)\n", p );
+	delete (int*)p;
+}
+
+int main()
+{
+	pthread_t thread[2];
+	pthread_key_create(&key, my_destructor);
+	printf("key=%d\n", key );
+	pthread_create( &thread[0], 0, handler_1, 0 );
+	pthread_create( &thread[1], 0, handler_2, 0 );
+	pthread_join( thread[0], 0 );
+	pthread_join( thread[1], 0 );
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+
+void foo(int *count)
+{
+	++*count;
+	printf("foo() : %d\n", *count ); 
+}
+
+void *handler_1(void *data)
+{
+	int count=0;
+	foo(&count);
+	foo(&count);
+	foo(&count);
+	return 0;
+}
+
+void *handler_2(void *data)
+{
+	int count=0;
+	foo(&count);
+	foo(&count);
+	return 0;
+}
+
+int main()
+{
+	pthread_t thread[2];
+	pthread_create( &thread[0], 0, handler_1, 0 );
+	pthread_create( &thread[1], 0, handler_2, 0 );
+	pthread_join( thread[0], 0 );
+	pthread_join( thread[1], 0 );
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+void *foo(void *data)
+{
+	char ip[] = "192.168.56.100";
+	char *p;
+	char *saveptr;
+
+	p = strtok_r( ip , "." , &saveptr);
+	while(p)
+	{
+		printf("[%s]\n", p );
+		p = strtok_r( saveptr , "." , &saveptr);
+		sleep(1);
+	}
+	return 0;
+}
+void *bar(void *data)
+{
+	char hp[] = "010-1234-5678";
+	char *p;
+	char *saveptr;
+
+	p = strtok_r( hp , "-" , &saveptr);
+	while(p)
+	{
+		printf("[%s]\n", p );
+		p = strtok_r( saveptr , "-" , &saveptr);
+		sleep(1);
+	}
+	return 0;
+}
+
+int main()
+{
+	pthread_t thread[2];
+	pthread_create( &thread[0], 0, foo, 0 );
+	pthread_create( &thread[1], 0, bar, 0 );
+	pthread_join( thread[0], 0 );
+	pthread_join( thread[1], 0 );
+	return 0;
+}
+#endif
+#if 0
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+void *foo(void *data)
+{
+	char ip[] = "192.168.56.100";
+	char *p;
+
+	p = strtok( ip , "." );
+	while(p)
+	{
+		printf("[%s]\n", p );
+		p = strtok( 0 , "." );
+		sleep(1);
+	}
+	return 0;
+}
+void *bar(void *data)
+{
+	char hp[] = "010-1234-5678";
+	char *p;
+
+	p = strtok( hp , "-" );
+	while(p)
+	{
+		printf("[%s]\n", p );
+		p = strtok( 0 , "-" );
+		sleep(1);
+	}
+	return 0;
+}
+
+int main()
+{
+	pthread_t thread[2];
+	pthread_create( &thread[0], 0, foo, 0 );
+	pthread_create( &thread[1], 0, bar, 0 );
+	pthread_join( thread[0], 0 );
+	pthread_join( thread[1], 0 );
+	return 0;
+}
+#endif
+
+#if 0
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+	char ip[] = "192.168.56.100";
+	char *p;
+
+	p = strtok( ip , "." );
+	while(p)
+	{
+		printf("[%s]\n", p );
+		p = strtok( 0 , "." );
+	}
+	return 0;
+}
+#endif