- new thread pool (no stucks anymore)

src/engine/helper/HL_ThreadPool.cpp

@@ -0,0 +1,51 @@
+#include "HL_ThreadPool.h"
+
+thread_pool::thread_pool(size_t num_of_threads, const std::string& name)
+{
+    this->name = name;
+    if (!num_of_threads)
+        num_of_threads = std::thread::hardware_concurrency();
+
+    for(size_t idx = 0; idx < num_of_threads; idx++)
+        this->workers.push_back(std::thread(&thread_pool::run_worker, this));
+}
+
+// Add new work item to the pool
+void thread_pool::enqueue(const thread_pool::task& t)
+{
+    {
+        std::unique_lock<std::mutex> lock(this->queue_mutex);
+        this->tasks.push(t);
+    }
+    this->condition.notify_one();
+}
+
+
+// the destructor joins all threads
+thread_pool::~thread_pool()
+{
+    {
+        std::unique_lock<std::mutex> lock(this->queue_mutex);
+        stop = true;
+    }
+    this->condition.notify_all();
+    for(std::thread &worker: workers)
+        worker.join();
+}
+
+void thread_pool::run_worker()
+{
+    ThreadHelper::setName(this->name);
+    task t;
+    while(!this->stop)
+    {
+        {
+            std::unique_lock<std::mutex> lock(this->queue_mutex);
+
+            this->condition.wait(lock, [this]{return !this->tasks.empty() || this->stop;});
+            t = this->tasks.front();
+            this->tasks.pop();
+        }
+        t(); // function<void()> type
+    }
+}