diff --git a/src/core/ffi/all_cases.cc b/src/core/ffi/all_cases.cc
index 065a136..70e9b93 100644
--- a/src/core/ffi/all_cases.cc
+++ b/src/core/ffi/all_cases.cc
@@ -25,3 +25,57 @@ int is_all_cases_prebuild_available() {
         return KLOTSKI_FALSE;
     }
 }
+
+void all_cases_build() {
+    AllCases::Instance().Build();
+}
+
+void all_cases_build_async(executor_t executor, notifier_t callback) {
+    executor([](void *cb) {
+        all_cases_build();
+        ((notifier_t)cb)();
+    }, (void*)callback);
+}
+
+void all_cases_parallel_build(executor_t executor) {
+    typedef std::function<void()> Runner;
+    AllCases::Instance().BuildParallel([executor](Runner &&runner) {
+        executor([](void *fn) {
+            (*(Runner*)fn)();
+            delete (Runner*)fn;
+        }, (void*)new Runner{std::move(runner)});
+    });
+}
+
+void all_cases_parallel_build_async(executor_t executor, notifier_t callback) {
+
+    typedef std::pair<executor_t, notifier_t> pp_t;
+
+    auto pp = new pp_t;
+    pp->first = executor;
+    pp->second = callback;
+
+
+    auto lambda = [](void *arg) {
+
+        std::cout << "enter lambda" << std::endl;
+
+        auto *pp = (pp_t*)arg;
+
+        all_cases_parallel_build(pp->first);
+
+        ((notifier_t)pp->second)();
+
+    };
+
+    executor(lambda, (void*)pp);
+
+}
+
+int is_all_cases_available() {
+    if (AllCases::Instance().IsAvailable()) {
+        return KLOTSKI_TRUE;
+    } else {
+        return KLOTSKI_FALSE;
+    }
+}
diff --git a/src/core/ffi/klotski.h b/src/core/ffi/klotski.h
index db2e9af..aa3b28a 100644
--- a/src/core/ffi/klotski.h
+++ b/src/core/ffi/klotski.h
@@ -32,8 +32,15 @@ EXTERN void all_cases_prebuild_async(executor_t executor, notifier_t callback);
 /// not completed, non-0 otherwise.
 EXTERN int is_all_cases_prebuild_available();
 
-//EXTERN void all_cases_build();
-//EXTERN int is_all_cases_available();
+EXTERN void all_cases_build();
+
+EXTERN void all_cases_build_async(executor_t executor, notifier_t callback);
+
+EXTERN void all_cases_parallel_build(executor_t executor);
+
+EXTERN void all_cases_parallel_build_async(executor_t executor, notifier_t callback);
+
+EXTERN int is_all_cases_available();
 
 //extern const uint32_t ALL_CASES_SIZE;
 //EXTERN_FUNC void export_all_cases(uint64_t *buffer);
diff --git a/src/main.c b/src/main.c
index 8b9dfbb..42d64c1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,56 +4,76 @@
 #include <unistd.h>
 #include "core/ffi/klotski.h"
 
-struct pthread_wrapper_t {
+typedef struct {
     void (*fn)(void*);
     void *arg;
-};
+} pthread_wrapper_t;
 
 void* pthread_wrapper(void *arg) {
-
-    printf("enter wrapper\n");
-
-    struct pthread_wrapper_t *kk = (struct pthread_wrapper_t*)arg;
-
+    printf("wrapper at %ld\n", pthread_self());
+    pthread_wrapper_t *kk = (pthread_wrapper_t*)arg;
     kk->fn(kk->arg);
-
     return NULL;
 }
 
 void callback() {
-    printf("enter callback\n");
+    printf("callback is triggered\n");
 }
 
 void executor(void(*fn)(void*), void *arg) {
     printf("executor receive task\n");
 //    fn(arg);
 
-    struct pthread_wrapper_t *kk = (struct pthread_wrapper_t*)malloc(sizeof(struct pthread_wrapper_t));
-
+    pthread_wrapper_t *kk = (pthread_wrapper_t*)malloc(sizeof(pthread_wrapper_t));
     kk->fn = fn;
     kk->arg = arg;
 
     pthread_t pp;
     pthread_create(&pp, NULL, pthread_wrapper, (void*)kk);
-
 }
 
 int main() {
-    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
-
+//    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
+//
 //    printf("prebuild begin\n");
 //    all_cases_prebuild();
 //    printf("prebuild complete\n");
-
-    printf("prebuild begin\n");
-    all_cases_prebuild_async(executor, callback);
-    printf("prebuild func exited\n");
-    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
-
+//
+//    printf("prebuild begin\n");
+//    all_cases_prebuild_async(executor, callback);
+//    printf("prebuild func exited\n");
+//    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
+//    printf("start sleep 3s\n");
+//    sleep(3);
+//
+//    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
+
+
+    printf("build available -> %d\n", is_all_cases_available());
+
+//    printf("build begin\n");
+//    all_cases_build();
+//    printf("build complete\n");
+
+//    printf("build begin\n");
+//    all_cases_build_async(executor, callback);
+//    printf("build func exited\n");
+//    printf("build available -> %d\n", is_all_cases_available());
+//    printf("start sleep 3s\n");
+//    sleep(3);
+
+//    printf("build begin\n");
+//    all_cases_parallel_build(executor);
+//    printf("build complete\n");
+
+    printf("build begin\n");
+    all_cases_parallel_build_async(executor, callback);
+    printf("build func exited\n");
+    printf("build available -> %d\n", is_all_cases_available());
     printf("start sleep 3s\n");
     sleep(3);
 
-    printf("prebuild available -> %d\n", is_all_cases_prebuild_available());
+    printf("build available -> %d\n", is_all_cases_available());
 
     return 0;
 }