diff --git a/main.c b/main.c
index 67aa713..f3faefc 100644
--- a/main.c
+++ b/main.c
@@ -19,9 +19,9 @@ int main() {
 
 //    pthread_t tid;
 
-    pool_t *pool = tiny_pool_create(0);
+    pool_t *pool = tiny_pool_create(2);
 
-    int dat[] = {1, 2, 3, 4, 5, 6};
+    int dat[] = {1, 2, 3, 4, 5, 6, 7, 8};
     tiny_pool_submit(pool, demo_fun, (void*)&dat[0]);
     tiny_pool_submit(pool, demo_fun, (void*)&dat[1]);
 
@@ -37,10 +37,18 @@ int main() {
     tiny_pool_submit(pool, demo_fun, (void*)&dat[3]);
     tiny_pool_submit(pool, demo_fun, (void*)&dat[4]);
 
+    sleep(8);
+
     // TODO: tiny pool join
-    sleep(15);
+
+    printf("pool try exit\n");
+    tiny_pool_kill(pool);
 
     // TODO: tiny pool destroy
 
+    sleep(20);
+
+    printf("main exit\n");
+
     return 0;
 }
diff --git a/tiny_pool.c b/tiny_pool.c
index 8a015bb..e40c4cb 100644
--- a/tiny_pool.c
+++ b/tiny_pool.c
@@ -1,15 +1,25 @@
 #include <malloc.h>
+#include <memory.h>
 #include "tiny_pool.h"
 
 pool_t* tiny_pool_create(uint32_t size) {
 
+    printf("create thread pool size -> %d\n", size);
+
     pool_t *pool = (pool_t*)malloc(sizeof(pool_t));
 
-    for (int i = 0; i < 8; ++i) {
-        pool->threads[i] = 0;
-    }
+//    for (int i = 0; i < 8; ++i) {
+//        pool->threads[i] = 0;
+//    }
+
+    pool->thread_num = size;
+    pool->threads = (pthread_t*)malloc(sizeof(pthread_t) * size);
+    memset(pool->threads, 0, sizeof(pthread_t) * size);
 
     pool->status = PREPARING;
+    pthread_mutex_init(&pool->status_changing, NULL);
+
+    pool->busy_thread_num = 0;
     pthread_mutex_init(&pool->busy_thread_num_mutex, NULL);
 
     pool->task_queue_front = NULL;
@@ -45,10 +55,11 @@ void task_queue_push(pool_t *pool, task_t *task) {
 
     ++pool->task_queue_size;
 
+    printf("push success -> size = %d\n", pool->task_queue_size);
+
     // TODO: unlock task queue
     pthread_mutex_unlock(&pool->task_queue_busy);
 
-    printf("push success\n");
 
     if (pool->status == RUNNING) {
 
@@ -108,10 +119,13 @@ task_t* task_queue_pop(pool_t *pool) {
 
     }
 
+    --pool->task_queue_size;
+
+    printf("pop success -> size = %d\n", pool->task_queue_size);
+
     // TODO: unlock task queue
     pthread_mutex_unlock(&pool->task_queue_busy);
 
-    printf("pop success\n");
 
     return front;
 
@@ -160,7 +174,7 @@ void tiny_pool_boot(pool_t *pool) {
 
     pthread_mutex_lock(&pool->task_queue_busy);
 
-    for (uint32_t i = 0; i < 8; ++i) {
+    for (uint32_t i = 0; i < pool->thread_num; ++i) {
 
         printf("start thread %d\n", i);
 
@@ -170,9 +184,23 @@ void tiny_pool_boot(pool_t *pool) {
 
     printf("thread boot complete\n");
 
+    pthread_mutex_lock(&pool->status_changing);
     pool->status = RUNNING;
+    pthread_mutex_unlock(&pool->status_changing);
 
     pthread_mutex_unlock(&pool->task_queue_busy);
 
 }
 
+void tiny_pool_kill(pool_t *pool) {
+
+    printf("pool enter EXITING status\n");
+
+    pthread_mutex_lock(&pool->status_changing);
+
+    pool->status = EXITING;
+
+    pthread_mutex_unlock(&pool->status_changing);
+
+}
+
diff --git a/tiny_pool.h b/tiny_pool.h
index 9bc8ce5..871d32a 100644
--- a/tiny_pool.h
+++ b/tiny_pool.h
@@ -10,6 +10,7 @@ typedef struct task_t {
     struct task_t *next;
 } task_t;
 
+// TODO: thread pool status -> preparing / running / exiting / exited
 enum tiny_pool_status {
     PREPARING,
     RUNNING,
@@ -18,7 +19,8 @@ enum tiny_pool_status {
 
 typedef struct {
 
-    pthread_t threads[8];
+    pthread_t *threads;
+    uint32_t thread_num;
 
     enum tiny_pool_status status;
     pthread_mutex_t status_changing;
@@ -44,8 +46,12 @@ void tiny_pool_submit(pool_t *pool, void (*func)(void*), void *arg);
 // TODO: confirm just run once
 void tiny_pool_boot(pool_t *pool);
 
-// TODO: thread pool status -> preparing / running / exiting / exited
+void tiny_pool_kill(pool_t *pool);
 
 // TODO: destroy method
 
+// pool join -> handle to remain tasks -> return when queue empty and not thread working
+
+// pool destroy -> only wait current working task -> ignore waiting tasks in queue -> free memory and exit
+
 #endif