diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d835c8..2be69d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,8 @@ set(CMAKE_C_STANDARD 99)
 
 project(tiny_thread_pool LANGUAGES C)
 
-add_library(tiny_pool tiny_pool.c)
+add_library(tiny_pool STATIC tiny_pool.c)
 target_link_libraries(tiny_pool pthread)
 
+add_subdirectory(demo/c)
 add_subdirectory(demo/cpp)
diff --git a/demo/c/CMakeLists.txt b/demo/c/CMakeLists.txt
new file mode 100644
index 0000000..4c4ec0e
--- /dev/null
+++ b/demo/c/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.0)
+
+set(CMAKE_C_STANDARD 99)
+
+project(tiny_pool_demo_c LANGUAGES C)
+
+include_directories(../..)
+
+add_executable(demo_c demo.c)
+target_link_libraries(demo_c tiny_pool)
diff --git a/demo/c/demo.c b/demo/c/demo.c
new file mode 100644
index 0000000..e2d7bca
--- /dev/null
+++ b/demo/c/demo.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <unistd.h>
+#include "tiny_pool.h"
+
+void test_fun(void *i) {
+    int num = *(int*)i;
+    printf("task %d start\n", num);
+    for (int t = 0; t < num; ++t) {
+        sleep(1);
+        printf("task %d running...\n", num);
+    }
+    printf("task %d complete\n", num);
+}
+
+int main() {
+    int dat[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+
+    pool_t *pool = tiny_pool_create(4);
+
+    tiny_pool_submit(pool, test_fun, (void*)&dat[0]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[1]);
+
+    tiny_pool_boot(pool);
+
+    sleep(5);
+
+    tiny_pool_submit(pool, test_fun, (void*)&dat[2]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[3]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[4]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[5]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[6]);
+
+    sleep(6);
+
+    tiny_pool_submit(pool, test_fun, (void*)&dat[7]);
+    tiny_pool_submit(pool, test_fun, (void*)&dat[8]);
+
+    tiny_pool_join(pool);
+
+    return 0;
+}
diff --git a/demo/demo.c b/demo/demo.c
deleted file mode 100644
index 1281707..0000000
--- a/demo/demo.c
+++ /dev/null
@@ -1,61 +0,0 @@
-#include <stdio.h>
-#include <unistd.h>
-#include "tiny_pool.h"
-
-void demo_fun(void *i) {
-    int num = *(int*)i;
-    printf("  task %d start\n", num);
-    for (int t = 0; t < num; ++t) {
-        sleep(1);
-        printf("  task %d running...\n", num);
-    }
-    printf("  task %d complete\n", num);
-}
-
-int main() {
-
-//    pool_t *pool = tiny_pool_create(2);
-    pool_t *pool = tiny_pool_create(4);
-
-    int dat[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[0]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[1]);
-
-    printf("+ main: pool booting\n");
-    tiny_pool_boot(pool);
-    printf("+ main: pool boot complete\n");
-
-    printf("+ main: sleep 5s\n");
-    sleep(5);
-    printf("+ main: wake up\n");
-
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[2]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[3]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[4]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[5]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[6]);
-
-    printf("+ main: sleep 8s\n");
-    sleep(6);
-    printf("+ main: wake up\n");
-
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[7]);
-    tiny_pool_submit(pool, demo_fun, (void*)&dat[8]);
-
-//    printf("+ main: pool joining\n");
-//    tiny_pool_join(pool);
-//    printf("+ main: pool join complete\n");
-
-//    printf("+ main: pool detach\n");
-//    tiny_pool_detach(pool);
-//    printf("+ main: pool detach complete\n");
-//    sleep(20);
-
-    printf("+ main: pool kill\n");
-    tiny_pool_kill(pool);
-    printf("+ main: pool kill complete\n");
-
-    printf("+ main exit\n");
-
-    return 0;
-}