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Telegram/lib_crl/crl/common/crl_common_queue.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <crl/common/crl_common_config.h>
+
+#include <crl/common/crl_common_list.h>
+#include <crl/common/crl_common_utils.h>
+#include <atomic>
+
+#ifndef CRL_USE_COMMON_QUEUE
+#define CRL_USE_COMMON_QUEUE
+#endif // !CRL_USE_COMMON_QUEUE
+
+namespace crl {
+namespace details {
+class main_queue_pointer;
+} // namespace details
+
+class queue {
+public:
+	queue();
+	queue(const queue &other) = delete;
+	queue &operator=(const queue &other) = delete;
+
+	template <typename Callable>
+	void async(Callable &&callable) {
+		if (_list.push_is_first(std::forward<Callable>(callable))) {
+			wake_async();
+		}
+	}
+
+	template <typename Callable>
+	void sync(Callable &&callable) {
+		semaphore waiter;
+		async([&] {
+			const auto guard = details::finally([&] { waiter.release(); });
+			callable();
+		});
+		waiter.acquire();
+	}
+
+private:
+	friend class details::main_queue_pointer;
+
+	static void ProcessCallback(void *that);
+
+	queue(main_queue_processor processor);
+
+	void wake_async();
+	void process();
+
+	main_queue_processor _main_processor = nullptr;
+	details::list _list;
+	std::atomic_flag _queued = ATOMIC_FLAG_INIT;
+
+};
+
+} // namespace crl