Fix edge case where the thread sometimes doesn't exit gracefully

.gitignore

@@ -0,0 +1,6 @@
+/.idea
+/.cache
+/.ccls-cache
+/compile_commands.json
+/cmake-build-debug
+/build

include/MultiThreading/Thread.h

@@ -14,11 +14,11 @@ namespace MultiThreading {
 class MultiThreading::Thread {
 private:
     std::thread worker;
-    std::function<void()> current_task;
+    std::function<void()> current_task = nullptr;
-    std::atomic<bool> busy{ false };
+    std::atomic<bool> busy = false;
     std::mutex mtx;
     std::condition_variable cv;
-    bool stop = false;
+    std::atomic<bool> stop = false;
 private:
     void Runner();
 public:

main.cpp

@@ -6,7 +6,7 @@
 
 using namespace MultiThreading;
 void some_test_func(int32_t hello) {
-    for (unsigned int i = 0; i < 4000000000; i++)
+    for (unsigned int i = 0; i < 400; i++)
         std::cout << "test" << std::endl;
 }
 

src/Task.cpp

@@ -1 +0,0 @@
-#include <MultiThreading/Task.h>

src/Thread.cpp

@@ -12,11 +12,9 @@ Thread::~Thread() {
         current_task = nullptr;
     }
 
-    if (Busy())
-        Join();
-
     cv.notify_all();
-    // Thread exits gracefully. If it does not, your program will likely freeze forever.
+    Join();
+    // Thread exits gracefully.
 }
 
 bool Thread::SetTask(std::shared_ptr<TaskBase> task) {