diff --git a/pthread.c b/pthread.c
new file mode 100644
index 0000000..3ce49a6
--- /dev/null
+++ b/pthread.c
@@ -0,0 +1,87 @@
+#define __LIBRARY__
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>   
+#include <errno.h>
+
+#define PAGE_SIZE 4096
+
+int pthread_create(pthread_t *thread,const pthread_attr_t* attr,void* (*start_routine)(void *),void* arg)
+{
+	pthread_t thread_id;
+	
+	if(thread == NULL || start_routine == NULL)
+	{
+		printf("Error:Thread or func_addr is NULL!!!\n");
+		exit(0);
+	}
+
+	if(attr != NULL && attr->stacksize > PAGE_SIZE)
+		return EINVAL;
+	
+	thread_id = thread_fork(attr,start_routine,arg);
+	if(thread_id == -1)
+	{
+		printf("Error:New thread creating failed!!!\n");
+		return errno;
+	}
+
+	if(thread_id > 0)
+	{
+		(*thread) = thread_id;
+		return 0;
+	}
+
+	printf("Error:pthread_create error!\n");
+	return -1;
+}
+
+int pthread_join(pthread_t thread,void** value_ptr)
+{
+	if(thread <=0)
+	{
+		printf("Error:Invalid thread for pthread_join!\n");
+		exit(0);
+	}
+
+	if(value_ptr == NULL)
+	{
+		printf("Error:value_ptr is invalid!\n");
+		exit(0);
+	}	
+		
+	thread_join(thread,value_ptr);
+
+	return 0;
+}
+
+void pthread_exit(void* value_ptr)
+{
+	thread_exit(value_ptr);
+}
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