feat: get basic ranges status

all_cases/basic_ranges.cc

@@ -15,6 +15,17 @@ inline uint32_t binary_count(uint32_t bin) { // get number of non-zero bits
     return bin & 0b111111;
 }
 
+BasicRanges::Status BasicRanges::basic_ranges_status() { // get basic ranges status
+    if (basic_ranges_available) {
+        return AVAILABLE; // basic ranges already built
+    }
+    if (!basic_ranges_building.try_lock()) { // fail to lock mutex -> another thread working
+        return BUILDING;
+    }
+    basic_ranges_building.unlock(); // release mutex
+    return NO_INIT;
+}
+
 const std::vector<uint32_t>* BasicRanges::get_basic_ranges() { // get const ptr of basic ranges
     if (basic_ranges.empty()) {
         build_basic_ranges(); // basic ranges initialize

all_cases/basic_ranges.h

@@ -6,27 +6,18 @@
 
 class BasicRanges {
 public:
-
     enum Status {
         NO_INIT,
         BUILDING,
         AVAILABLE,
     };
-
     static void build_basic_ranges();
-
     static enum Status basic_ranges_status();
-
     static const std::vector<uint32_t>* get_basic_ranges();
 
 private:
-
     static bool basic_ranges_available;
-
     static std::mutex basic_ranges_building;
-
     static std::vector<uint32_t> basic_ranges;
-
     static void generate_ranges(int n1, int n2, int n3, int n4);
-
 };

all_cases/main.cc

@@ -4,15 +4,35 @@
 
 #include <thread>
 
+void get_status() {
+    switch (BasicRanges::basic_ranges_status()) {
+        case BasicRanges::NO_INIT:
+            std::cout << "basic ranges no init" << std::endl;
+            break;
+        case BasicRanges::BUILDING:
+            std::cout << "basic ranges building" << std::endl;
+            break;
+        case BasicRanges::AVAILABLE:
+            std::cout << "basic ranges available" << std::endl;
+            break;
+    }
+}
+
 int main() {
+
+    get_status();
+
     std::thread t1(BasicRanges::build_basic_ranges);
     std::thread t2(BasicRanges::build_basic_ranges);
     std::thread t3(BasicRanges::build_basic_ranges);
+    std::thread t(get_status);
     t1.join();
     t2.join();
     t3.join();
+    t.join();
+
+    get_status();
 
-//    BasicRanges::build_basic_ranges();
     std::cout << BasicRanges::get_basic_ranges()->size() << std::endl;
 
     return 0;