diff --git a/examples/kernel/SConscript b/examples/kernel/SConscript
index 1020d7dfef02de58c32a856e48bffc6b0d783a8f..e3325b3bfe812ec4d387dcd47a29fa14258f371c 100644
--- a/examples/kernel/SConscript
+++ b/examples/kernel/SConscript
@@ -17,6 +17,8 @@ semaphore_static.c
 semaphore_dynamic.c
 semaphore_priority.c
 semaphore_buffer_worker.c
+semaphore_producer_consumer.c
+mutex_simple.c
 heap_malloc.c
 heap_realloc.c
 """)
diff --git a/examples/kernel/mutex_simple.c b/examples/kernel/mutex_simple.c
new file mode 100644
index 0000000000000000000000000000000000000000..574404a970e60604fc3a40b94b5b16353b417b25
--- /dev/null
+++ b/examples/kernel/mutex_simple.c
@@ -0,0 +1,108 @@
+/*
+ * 程序清单：
+ */
+#include <rtthread.h>
+#include "tc_comm.h"
+
+/* 指向线程控制块的指针 */
+static rt_thread_t tid1 = RT_NULL;
+static rt_thread_t tid2 = RT_NULL;
+static rt_thread_t tid3 = RT_NULL;
+
+/* 线程1入口 */
+static void thread1_entry(void* parameter)
+{
+	while (1)
+	{
+	}
+}
+
+/* 线程2入口 */
+static void thread2_entry(void* parameter)
+{
+	while (1)
+	{
+	}
+}
+
+/* 线程3入口 */
+static void thread3_entry(void* parameter)
+{
+	while (1)
+	{
+	}
+}
+
+int mutex_simple_init()
+{
+	/* 创建线程1 */
+	tid1 = rt_thread_create("t1",
+		thread1_entry, RT_NULL, /* 线程入口是thread1_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY - 1, THREAD_TIMESLICE);
+	if (tid1 != RT_NULL)
+		rt_thread_startup(tid1);
+	else
+		tc_stat(TC_STAT_END | TC_STAT_FAILED);
+
+	/* 创建线程2 */
+	tid2 = rt_thread_create("t2",
+		thread2_entry, RT_NULL, /* 线程入口是thread2_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
+	if (tid2 != RT_NULL)
+		rt_thread_startup(tid2);
+	else
+		tc_stat(TC_STAT_END | TC_STAT_FAILED);
+
+	/* 创建线程3 */
+	tid3 = rt_thread_create("t3",
+		thread3_entry, RT_NULL, /* 线程入口是thread3_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
+	if (tid3 != RT_NULL)
+		rt_thread_startup(tid3);
+	else
+		tc_stat(TC_STAT_END | TC_STAT_FAILED);
+
+	return 0;
+}
+
+#ifdef RT_USING_TC
+static void _tc_cleanup()
+{
+	/* 调度器上锁，上锁后，将不再切换到其他线程，仅响应中断 */
+	rt_enter_critical();
+
+	/* 删除线程 */
+	if (tid1 != RT_NULL && tid1->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(tid1);
+	if (tid2 != RT_NULL && tid2->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(tid2);
+	if (tid3 != RT_NULL && tid3->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(tid3);
+
+	/* 调度器解锁 */
+	rt_exit_critical();
+
+	/* 设置TestCase状态 */
+	tc_done(TC_STAT_PASSED);
+}
+
+int _tc_mutex_simple()
+{
+	/* 设置TestCase清理回调函数 */
+	tc_cleanup(_tc_cleanup);
+	mutex_simple_init();
+
+	/* 返回TestCase运行的最长时间 */
+	return 100;
+}
+/* 输出函数命令到finsh shell中 */
+FINSH_FUNCTION_EXPORT(_tc_mutex_simple, sime mutex example);
+#else
+/* 用户应用入口 */
+int rt_application_init()
+{
+	mutex_simple_init();
+
+	return 0;
+}
+#endif
diff --git a/examples/kernel/semaphore_buffer_worker.c b/examples/kernel/semaphore_buffer_worker.c
index 8dcf24206386b35d8878e6eeead11f9f555e302b..96afb43dde39cf3dccfa12ac723e13fe28f2f3ea 100644
--- a/examples/kernel/semaphore_buffer_worker.c
+++ b/examples/kernel/semaphore_buffer_worker.c
@@ -1,82 +1,217 @@
+/*
+ * 程序清单：信号量实现生产者消费者间的互斥
+ *
+ * 在这个程序中，会创建两个线程，一个是生成者线程worker一个是消费者线程thread
+ *
+ * 在数据信息生产、消费的过程中，worker负责把数据将写入到环形buffer中，而thread
+ * 则从环形buffer中读出。
+ */
 #include <rtthread.h>
 #include "tc_comm.h"
 
-static rt_sem_t sem;
-static rt_thread_t t1, worker;
+/* 一个环形buffer的实现 */
+struct rb
+{
+	rt_uint16_t read_index, write_index;
+	rt_uint8_t *buffer_ptr;
+	rt_uint16_t buffer_size;
+};
 
-#define BUFFER_SIZE		256
-#define DATA_ITEM_SIZE	32
+/* 指向信号量控制块的指针 */
+static rt_sem_t sem = RT_NULL;
+/* 指向线程控制块的指针 */
+static rt_thread_t tid = RT_NULL, worker = RT_NULL;
 
+/* 环形buffer的内存块（用数组体现出来） */
+#define BUFFER_SIZE		256
+#define BUFFER_ITEM		32
 static rt_uint8_t working_buffer[BUFFER_SIZE];
-static rt_uint16_t write_index, read_index;
+struct rb working_rb;
 
-static void thread1_entry(void* parameter)
+/* 初始化环形buffer，size指的是buffer的大小。注：这里并没对数据地址对齐做处理 */
+static void rb_init(struct rb* rb, rt_uint8_t *pool, rt_uint16_t size)
 {
-	rt_err_t result;
-	rt_uint16_t next_index;
-	rt_uint8_t data[DATA_ITEM_SIZE];
+	RT_ASSERT(rb != RT_NULL);
 
-	while (1)
+	/* 对读写指针清零*/
+	rb->read_index = rb->write_index = 0;
+
+	/* 设置环形buffer的内存数据块 */
+	rb->buffer_ptr = pool;
+	rb->buffer_size = size;
+}
+
+/* 向环形buffer中写入数据 */
+static rt_bool_t rb_put(struct rb* rb, const rt_uint8_t *ptr, rt_uint16_t length)
+{
+	rt_size_t size;
+
+	/* 判断是否有足够的剩余空间 */
+	if (rb->read_index > rb->write_index)
+		size = rb->read_index - rb->write_index;
+	else
+		size = rb->buffer_size - rb->write_index + rb->read_index;
+
+	/* 没有多余的空间 */
+	if (size < length) return RT_FALSE;
+
+	if (rb->read_index > rb->write_index)
 	{
-		/* take a semaphore */
-		result = rt_sem_take(sem, RT_WAITING_FOREVER);
-		if (result != RT_EOK)
+		/* read_index - write_index 即为总的空余空间 */
+		memcpy(&rb->buffer_ptr[rb->write_index], ptr, length);
+		rb->write_index += length;
+	}
+	else
+	{
+		if (rb->buffer_size - rb->write_index > length)
+		{
+			/* write_index 后面剩余的空间有足够的长度 */
+			memcpy(&rb->buffer_ptr[rb->write_index], ptr, length);
+			rb->write_index += length;
+		}
+		else
 		{
-			tc_done(TC_STAT_FAILED);
-			return;
+			/*
+			 * write_index 后面剩余的空间不存在足够的长度，需要把部分数据复制到
+			 * 前面的剩余空间中
+			 */
+			memcpy(&rb->buffer_ptr[rb->write_index], ptr,
+				rb->buffer_size - rb->write_index);
+			memcpy(&rb->buffer_ptr[0], &ptr[rb->buffer_size - rb->write_index],
+				length - (rb->buffer_size - rb->write_index));
+			rb->write_index = length - (rb->buffer_size - rb->write_index);
 		}
+	}
+
+	return RT_TRUE;
+}
 
-		/* read buffer */
+/* 从环形buffer中读出数据 */
+static rt_bool_t rb_get(struct rb* rb, rt_uint8_t *ptr, rt_uint16_t length)
+{
+	rt_size_t size;
 
-		/* release semaphore */
-		rt_sem_release(sem);
+	/* 判断是否有足够的数据 */
+	if (rb->read_index > rb->write_index)
+		size = rb->buffer_size - rb->read_index + rb->write_index;
+	else
+		size = rb->write_index - rb->read_index;
+
+	/* 没有足够的数据 */
+	if (size < length) return RT_FALSE;
+
+	if (rb->read_index > rb->write_index)
+	{
+		if (rb->buffer_size - rb->read_index > length)
+		{
+			/* read_index的数据足够多，直接复制 */
+			memcpy(ptr, &rb->buffer_ptr[rb->read_index], length);
+			rb->read_index += length;
+		}
+		else
+		{
+			/* read_index的数据不够，需要分段复制 */
+			memcpy(ptr, &rb->buffer_ptr[rb->read_index],
+				rb->buffer_size - rb->read_index);
+			memcpy(&ptr[rb->buffer_size - rb->read_index], &rb->buffer_ptr[0],
+				length - rb->buffer_size + rb->read_index);
+			rb->read_index = length - rb->buffer_size + rb->read_index;
+		}
 	}
+	else
+	{
+		/*
+		 * read_index要比write_index小，总的数据量够（前面已经有总数据量的判
+		 * 断），直接复制出数据。
+		 */
+		memcpy(ptr, &rb->buffer_ptr[rb->read_index], length);
+		rb->read_index += length;
+	}
+
+	return RT_TRUE;
 }
 
-static void worker_thread_entry(void* parameter)
+/* 生产者线程入口 */
+static void thread_entry(void* parameter)
 {
-	rt_err_t result;
-	rt_uint16_t next_index;
-	rt_uint8_t data[DATA_ITEM_SIZE];
+	rt_bool_t result;
+	rt_uint8_t data_buffer[BUFFER_ITEM];
 
 	while (1)
 	{
-		/* take a semaphore */
-		result = rt_sem_take(sem, RT_WAITING_FOREVER);
-		if (result != RT_EOK)
+		/* 持有信号量 */
+		rt_sem_take(sem, RT_WAITING_FOREVER);
+		/* 从环buffer中获得数据 */
+		result = rb_get(&working_rb, &data_buffer[0], BUFFER_ITEM);
+		/* 释放信号量 */
+		rt_sem_release(sem);
+
+		if (result == RT_TRUE)
 		{
-			tc_done(TC_STAT_FAILED);
-			return;
+			/* 获取数据成功，打印数据 */
+			rt_kprintf("%s\n", data_buffer);
 		}
 
-		/* write buffer */
+		/* 做一个5 OS Tick的休眠 */
+		rt_thread_delay(5);
+	}
+}
 
-		/* release semaphore */
+/* worker线程入口 */
+static void worker_entry(void* parameter)
+{
+	rt_bool_t result;
+	rt_uint32_t index, setchar;
+	rt_uint8_t  data_buffer[BUFFER_ITEM];
+
+	setchar = 0x21;
+	while (1)
+	{
+		/* 构造数据 */
+		for(index = 0; index < BUFFER_ITEM; index++)
+		{
+			data_buffer[index] = setchar;
+			if (++setchar == 0x7f)
+				setchar = 0x21;
+		}
+
+		/* 持有信号量 */
+		rt_sem_take(sem, RT_WAITING_FOREVER);
+		/* 把数据放到环形buffer中 */
+		result = rb_put(&working_rb, &data_buffer[0], BUFFER_ITEM);
+		/* 释放信号量 */
 		rt_sem_release(sem);
+
+		/* 放入成功，做一个10 OS Tick的休眠 */
+		rt_thread_delay(10);
 	}
 }
 
 int semaphore_buffer_worker_init()
 {
-	sem = rt_sem_create("sem", 0, RT_IPC_FLAG_FIFO);
+	/* 初始化ring buffer */
+	rb_init(&working_rb, working_buffer, BUFFER_SIZE);
+
+	/* 创建信号量 */
+	sem = rt_sem_create("sem", 1, RT_IPC_FLAG_FIFO);
 	if (sem == RT_NULL)
 	{
 		tc_stat(TC_STAT_END | TC_STAT_FAILED);
 		return 0;
 	}
 
-	write_index = read_index = 0;
-
-	t1 = rt_thread_create("t1",
-		thread1_entry, RT_NULL,
-		THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
-	if (t1 != RT_NULL)
-		rt_thread_startup(t1);
+	/* 创建线程1 */
+	tid = rt_thread_create("thread",
+		thread_entry, RT_NULL, /* 线程入口是thread_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
+	if (tid != RT_NULL)
+		rt_thread_startup(tid);
 	else
 		tc_stat(TC_STAT_END | TC_STAT_FAILED);
 
+	/* 创建线程2 */
 	worker = rt_thread_create("worker",
-		worker_thread_entry, RT_NULL,
+		worker_entry, RT_NULL, /* 线程入口是worker_entry, 入口参数是RT_NULL */
 		THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
 	if (worker != RT_NULL)
 		rt_thread_startup(worker);
@@ -89,29 +224,39 @@ int semaphore_buffer_worker_init()
 #ifdef RT_USING_TC
 static void _tc_cleanup()
 {
-	/* lock scheduler */
+	/* 调度器上锁，上锁后，将不再切换到其他线程，仅响应中断 */
 	rt_enter_critical();
 
-	/* delete t1, t2 and worker thread */
-	rt_thread_delete(t1);
-	rt_thread_delete(worker);
+	/* 删除信号量 */
+	if (sem != RT_NULL)
+		rt_sem_delete(sem);
 
-	tc_stat(TC_STAT_PASSED);
+	/* 删除线程 */
+	if (tid != RT_NULL && tid->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(tid);
+	if (worker != RT_NULL && worker->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(worker);
 
-	/* unlock scheduler */
+	/* 调度器解锁 */
 	rt_exit_critical();
+
+	/* 设置TestCase状态 */
+	tc_done(TC_STAT_PASSED);
 }
 
 int _tc_semaphore_buffer_worker()
 {
-	/* set tc cleanup */
+	/* 设置TestCase清理回调函数 */
 	tc_cleanup(_tc_cleanup);
 	semaphore_buffer_worker_init();
 
-	return 50;
+	/* 返回TestCase运行的最长时间 */
+	return 100;
 }
-FINSH_FUNCTION_EXPORT(_tc_semaphore_buffer_worker, two threads working on a buffer example);
+/* 输出函数命令到finsh shell中 */
+FINSH_FUNCTION_EXPORT(_tc_semaphore_buffer_worker, a buffer worker with semaphore example);
 #else
+/* 用户应用入口 */
 int rt_application_init()
 {
 	semaphore_buffer_worker_init();
diff --git a/examples/kernel/semaphore_producer_consumer.c b/examples/kernel/semaphore_producer_consumer.c
new file mode 100644
index 0000000000000000000000000000000000000000..5ea98fbeae62e82ab1900132d9159ce9ba781091
--- /dev/null
+++ b/examples/kernel/semaphore_producer_consumer.c
@@ -0,0 +1,154 @@
+/*
+ * 程序清单：生产者消费者例子
+ *
+ * 这个例子中将创建两个线程用于实现生产者消费者问题
+ */
+#include <rtthread.h>
+#include "tc_comm.h"
+
+/* 定义最大5个元素能够被产生 */
+#define MAXSEM 5
+
+/* 用于放置生产的整数数组 */
+rt_uint32_t array[MAXSEM];
+/* 指向生产者、消费者在array数组中的读写位置 */
+static rt_uint32_t set, get;
+
+/* 指向线程控制块的指针 */
+static rt_thread_t producer_tid = RT_NULL;
+static rt_thread_t consumer_tid = RT_NULL;
+
+struct rt_semaphore sem_lock;
+struct rt_semaphore sem_empty, sem_full;
+
+/* 生成者线程入口 */
+void producer_thread_entry(void* parameter)
+{
+	int cnt = 0;
+
+	/* 运行100次 */
+	while( cnt < 100)
+	{
+		/* 获取一个空位 */
+		rt_sem_take(&sem_empty, RT_WAITING_FOREVER);
+
+		/* 修改array内容，上锁 */
+		rt_sem_take(&sem_lock, RT_WAITING_FOREVER);
+		array[set%MAXSEM] = cnt + 1;
+		rt_kprintf("the producer generates a number: %d\n", array[set%MAXSEM]);
+		set++;
+		rt_sem_release(&sem_lock);
+
+		/* 发布一个满位 */
+		rt_sem_release(&sem_full);
+		cnt++;
+
+		/* 暂停一段时间 */
+		rt_thread_delay(50);
+	}
+
+	rt_kprintf("the producer exit!\n");
+}
+
+/* 消费者线程入口 */
+void consumer_thread_entry(void* parameter)
+{
+	rt_uint32_t no;
+	rt_uint32_t sum;
+
+	/* 第n个线程，由入口参数传进来 */
+	no = (rt_uint32_t)parameter;
+
+	while(1)
+	{
+		/* 获取一个满位 */
+		rt_sem_take(&sem_full, RT_WAITING_FOREVER);
+
+		/* 临界区，上锁进行操作 */
+		rt_sem_take(&sem_lock, RT_WAITING_FOREVER);
+		sum += array[get%MAXSEM];
+		rt_kprintf("the consumer[%d] get a number: %d\n", no, array[get%MAXSEM] );
+		get++;
+		rt_sem_release(&sem_lock);
+
+		/* 释放一个空位 */
+		rt_sem_release(&sem_empty);
+
+		/* 生产者生产到100个数目，停止，消费者线程相应停止 */
+		if (get == 100) break;
+
+		/* 暂停一小会时间 */
+		rt_thread_delay(10);
+	}
+
+	rt_kprintf("the consumer[%d] sum is %d \n ", no, sum);
+	rt_kprintf("the consumer[%d] exit!\n");
+}
+
+int producer_consumer_init()
+{
+	/* 初始化3个信号量 */
+	rt_sem_init(&sem_lock , "lock",     1,      RT_IPC_FLAG_FIFO);
+	rt_sem_init(&sem_empty, "empty",    MAXSEM, RT_IPC_FLAG_FIFO);
+	rt_sem_init(&sem_full , "full",     0,      RT_IPC_FLAG_FIFO);
+
+	/* 创建线程1 */
+	producer_tid = rt_thread_create("producer",
+		producer_thread_entry, RT_NULL, /* 线程入口是producer_thread_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY - 1, THREAD_TIMESLICE);
+	if (producer_tid != RT_NULL)
+		rt_thread_startup(producer_tid);
+	else
+		tc_stat(TC_STAT_END | TC_STAT_FAILED);
+
+	/* 创建线程2 */
+	consumer_tid = rt_thread_create("consumer",
+		consumer_thread_entry, RT_NULL, /* 线程入口是consumer_thread_entry, 入口参数是RT_NULL */
+		THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
+	if (consumer_tid != RT_NULL)
+		rt_thread_startup(consumer_tid);
+	else
+		tc_stat(TC_STAT_END | TC_STAT_FAILED);
+
+	return 0;
+}
+
+#ifdef RT_USING_TC
+static void _tc_cleanup()
+{
+	/* 调度器上锁，上锁后，将不再切换到其他线程，仅响应中断 */
+	rt_enter_critical();
+
+	/* 删除线程 */
+	if (producer_tid != RT_NULL && producer_tid->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(producer_tid);
+	if (consumer_tid != RT_NULL && consumer_tid->stat != RT_THREAD_CLOSE)
+		rt_thread_delete(consumer_tid);
+
+	/* 调度器解锁 */
+	rt_exit_critical();
+
+	/* 设置TestCase状态 */
+	tc_done(TC_STAT_PASSED);
+}
+
+int _tc_producer_consumer()
+{
+	/* 设置TestCase清理回调函数 */
+	tc_cleanup(_tc_cleanup);
+	producer_consumer_init();
+
+	/* 返回TestCase运行的最长时间 */
+	return 100;
+}
+/* 输出函数命令到finsh shell中 */
+FINSH_FUNCTION_EXPORT(_tc_producer_consumer, producer and consumer example);
+#else
+/* 用户应用入口 */
+int rt_application_init()
+{
+	producer_consumer_init();
+
+	return 0;
+}
+#endif