Uploading the main structure

node_modules/@parcel/watcher/src/Signal.hh

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+#ifndef SIGNAL_H
+#define SIGNAL_H
+
+#include <mutex>
+#include <condition_variable>
+
+class Signal {
+public:
+  Signal() : mFlag(false), mWaiting(false) {}
+  void wait() {
+    std::unique_lock<std::mutex> lock(mMutex);
+    while (!mFlag) {
+      mWaiting = true;
+      mCond.wait(lock);
+    }
+  }
+
+  std::cv_status waitFor(std::chrono::milliseconds ms) {
+    std::unique_lock<std::mutex> lock(mMutex);
+    return mCond.wait_for(lock, ms);
+  }
+
+  void notify() {
+    std::unique_lock<std::mutex> lock(mMutex);
+    mFlag = true;
+    mCond.notify_all();
+  }
+
+  void reset() {
+    std::unique_lock<std::mutex> lock(mMutex);
+    mFlag = false;
+    mWaiting = false;
+  }
+  
+  bool isWaiting() {
+    return mWaiting;
+  }
+
+private:
+  bool mFlag;
+  bool mWaiting;
+  std::mutex mMutex;
+  std::condition_variable mCond;
+};
+
+#endif