split project with app & doric module

doric-Qt/example/doric/utils/DoricCountDownLatch.h

@@ -0,0 +1,32 @@
+#ifndef COUNTDOWNLATCH_H
+#define COUNTDOWNLATCH_H
+
+#include <QSemaphore>
+#include <climits>
+
+class DoricCountDownLatch {
+  Q_DISABLE_COPY(DoricCountDownLatch)
+  QSemaphore m_sem{INT_MAX};
+
+public:
+  DoricCountDownLatch() {}
+  ~DoricCountDownLatch() {
+    m_sem.acquire(INT_MAX);
+    m_sem.release(INT_MAX);
+  }
+  class Locker {
+    DoricCountDownLatch *sem;
+
+  public:
+    Locker(const Locker &other) : sem{other.sem} { sem->m_sem.acquire(); }
+    Locker(Locker &&other) : sem{other.sem} { other.sem = nullptr; }
+    Locker(DoricCountDownLatch *sem) : sem{sem} { sem->m_sem.acquire(); }
+    ~Locker() {
+      if (sem)
+        sem->m_sem.release();
+    }
+  };
+  Locker lock() { return Locker{this}; }
+};
+
+#endif // COUNTDOWNLATCH_H