diff --git a/all_cases/all_cases.cc b/all_cases/all_cases.cc
index cb24166..bd33119 100644
--- a/all_cases/all_cases.cc
+++ b/all_cases/all_cases.cc
@@ -34,3 +34,14 @@ void AllCases::build_all_cases() { // build all cases
     }
     AllCases::all_cases_building.unlock();
 }
+
+AllCases::Status AllCases::all_cases_status() { // get all cases status
+    if (all_cases_available) {
+        return AVAILABLE; // all cases already built
+    }
+    if (!all_cases_building.try_lock()) { // fail to lock mutex -> another thread working
+        return BUILDING;
+    }
+    all_cases_building.unlock(); // release mutex
+    return NO_INIT;
+}
diff --git a/all_cases/all_cases.h b/all_cases/all_cases.h
index 89f9e9f..79e235d 100644
--- a/all_cases/all_cases.h
+++ b/all_cases/all_cases.h
@@ -8,6 +8,7 @@
 class AllCases : public BasicRanges {
 public:
     static void build_all_cases();
+    static enum Status all_cases_status();
     static const std::vector<uint32_t> (*get_all_cases())[16];
 
 private:
diff --git a/all_cases/main.cc b/all_cases/main.cc
index f424045..1277476 100644
--- a/all_cases/main.cc
+++ b/all_cases/main.cc
@@ -16,6 +16,18 @@ void get_status() {
             std::cout << "basic ranges available" << std::endl;
             break;
     }
+
+    switch (AllCases::all_cases_status()) {
+        case AllCases::NO_INIT:
+            std::cout << "all cases no init" << std::endl;
+            break;
+        case AllCases::BUILDING:
+            std::cout << "all cases building" << std::endl;
+            break;
+        case AllCases::AVAILABLE:
+            std::cout << "all cases available" << std::endl;
+            break;
+    }
 }
 
 int main() {
@@ -36,18 +48,27 @@ int main() {
 //    std::cout << BasicRanges::get_basic_ranges()->size() << std::endl;
 
 
+    get_status();
+
     std::thread t1(AllCases::build_all_cases);
     std::thread t2(AllCases::build_all_cases);
     std::thread t3(AllCases::build_all_cases);
+    std::thread t(get_status);
     t1.join();
     t2.join();
     t3.join();
+    t.join();
 
-    AllCases::build_all_cases();
+//    AllCases::build_all_cases();
+
+    get_status();
 
     for (auto const &all_case : *AllCases::get_all_cases()) {
-        std::cout << all_case.size() << std::endl;
+        std::cout << "  " << all_case.size() << std::endl;
     }
 
+    std::cout << BasicRanges::get_basic_ranges() << std::endl;
+    std::cout << AllCases::get_basic_ranges() << std::endl;
+
     return 0;
 }