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tdutils/td/utils/port/detail/KQueue.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+
+#include "td/utils/port/config.h"
+
+#ifdef TD_POLL_KQUEUE
+
+#include "td/utils/common.h"
+#include "td/utils/List.h"
+#include "td/utils/port/detail/NativeFd.h"
+#include "td/utils/port/detail/PollableFd.h"
+#include "td/utils/port/PollBase.h"
+#include "td/utils/port/PollFlags.h"
+
+#include <cstdint>
+
+#include <sys/types.h>  // must be included before sys/event.h, which depends on sys/types.h on FreeBSD
+
+#include <sys/event.h>
+
+namespace td {
+namespace detail {
+
+class KQueue final : public PollBase {
+ public:
+  KQueue() = default;
+  KQueue(const KQueue &) = delete;
+  KQueue &operator=(const KQueue &) = delete;
+  KQueue(KQueue &&) = delete;
+  KQueue &operator=(KQueue &&) = delete;
+  ~KQueue() override;
+
+  void init() override;
+
+  void clear() override;
+
+  void subscribe(PollableFd fd, PollFlags flags) override;
+
+  void unsubscribe(PollableFdRef fd) override;
+
+  void unsubscribe_before_close(PollableFdRef fd) override;
+
+  void run(int timeout_ms) override;
+
+  static bool is_edge_triggered() {
+    return true;
+  }
+
+ private:
+  vector<struct kevent> events_;
+  int changes_n_;
+  NativeFd kq_;
+  ListNode list_root_;
+
+  int update(int nevents, const timespec *timeout, bool may_fail = false);
+
+  void invalidate(int native_fd);
+
+  void flush_changes(bool may_fail = false);
+
+  void add_change(std::uintptr_t ident, int16 filter, uint16 flags, uint32 fflags, std::intptr_t data, void *udata);
+};
+
+}  // namespace detail
+}  // namespace td
+
+#endif