123 lines
2.7 KiB
C++
123 lines
2.7 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/StringBuilder.h"
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#include <atomic>
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namespace td {
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class PollFlags {
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public:
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using Raw = int32;
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bool can_read() const {
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return has_flags(Read());
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}
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bool can_write() const {
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return has_flags(Write());
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}
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bool can_close() const {
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return has_flags(Close());
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}
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bool has_pending_error() const {
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return has_flags(Error());
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}
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void remove_flags(PollFlags flags) {
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remove_flags(flags.raw());
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}
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bool add_flags(PollFlags flags) {
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auto old_flags = flags_;
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add_flags(flags.raw());
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return old_flags != flags_;
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}
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bool has_flags(PollFlags flags) const {
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return has_flags(flags.raw());
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}
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bool empty() const {
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return flags_ == 0;
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}
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Raw raw() const {
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return flags_;
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}
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static PollFlags from_raw(Raw raw) {
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return PollFlags(raw);
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}
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PollFlags() = default;
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bool operator==(const PollFlags &other) const {
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return flags_ == other.flags_;
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}
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bool operator!=(const PollFlags &other) const {
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return !(*this == other);
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}
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PollFlags operator|(const PollFlags other) const {
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return from_raw(raw() | other.raw());
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}
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static PollFlags Write() {
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return PollFlags(Flag::Write);
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}
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static PollFlags Error() {
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return PollFlags(Flag::Error);
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}
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static PollFlags Close() {
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return PollFlags(Flag::Close);
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}
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static PollFlags Read() {
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return PollFlags(Flag::Read);
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}
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static PollFlags ReadWrite() {
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return Read() | Write();
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}
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private:
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enum class Flag : Raw { Write = 0x001, Read = 0x002, Close = 0x004, Error = 0x008, None = 0 };
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Raw flags_{static_cast<Raw>(Flag::None)};
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explicit PollFlags(Raw raw) : flags_(raw) {
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}
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explicit PollFlags(Flag flag) : PollFlags(static_cast<Raw>(flag)) {
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}
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PollFlags &add_flags(Raw flags) {
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flags_ |= flags;
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return *this;
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}
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PollFlags &remove_flags(Raw flags) {
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flags_ &= ~flags;
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return *this;
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}
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bool has_flags(Raw flags) const {
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return (flags_ & flags) == flags;
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}
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};
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StringBuilder &operator<<(StringBuilder &sb, PollFlags flags);
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class PollFlagsSet {
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public:
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// write flags from any thread
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// this is the only function that should be called from other threads
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bool write_flags(PollFlags flags);
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bool write_flags_local(PollFlags flags);
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bool flush() const;
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PollFlags read_flags() const;
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PollFlags read_flags_local() const;
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void clear_flags(PollFlags flags);
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void clear();
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private:
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mutable std::atomic<PollFlags::Raw> to_write_{0};
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mutable PollFlags flags_;
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};
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} // namespace td
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