Remove pthread dependency

src/ftxui/component/task_internal.hpp

@@ -0,0 +1,42 @@
+// Copyright 2024 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#ifndef TASK_HPP
+#define TASK_HPP
+
+#include <chrono>
+#include <functional>
+#include <optional>
+
+namespace ftxui::task {
+
+/// A task represents a unit of work.
+using Task = std::function<void()>;
+
+/// A PendingTask represents a task that is scheduled to be executed at a
+/// specific time, or as soon as possible.
+struct PendingTask {
+  // Immediate task:
+  PendingTask(Task t) : task(std::move(t)) {}  // NOLINT
+
+  // Delayed task with a duration
+  PendingTask(Task t, std::chrono::steady_clock::duration duration)
+      : task(std::move(t)),
+        time(std::chrono::steady_clock::now() + duration) {}
+
+  /// The task to be executed.
+  Task task;
+
+  /// The time when the task should be executed. If the time is empty, the task
+  /// should be executed as soon as possible.
+  std::optional<std::chrono::steady_clock::time_point> time;
+
+  /// Compare two PendingTasks by their time.
+  /// If both tasks have no time, they are considered equal.
+  bool operator<(const PendingTask& other) const;
+};
+
+} // namespace ftxui::task
+
+
+#endif  // TASK_HPP_