tdlight/tdutils/td/utils/port/PollFlags.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/StringBuilder.h"
#include <atomic>
namespace td {
class PollFlags {
public:
using Raw = int32;
bool can_read() const {
return has_flags(Read());
}
bool can_write() const {
return has_flags(Write());
}
bool can_close() const {
return has_flags(Close());
}
bool has_pending_error() const {
return has_flags(Error());
}
void remove_flags(PollFlags flags) {
remove_flags(flags.raw());
}
bool add_flags(PollFlags flags) {
auto old_flags = flags_;
add_flags(flags.raw());
return old_flags != flags_;
}
bool has_flags(PollFlags flags) const {
return has_flags(flags.raw());
}
bool empty() const {
return flags_ == 0;
}
Raw raw() const {
return flags_;
}
static PollFlags from_raw(Raw raw) {
return PollFlags(raw);
}
PollFlags() = default;
bool operator==(const PollFlags &other) const {
return flags_ == other.flags_;
}
bool operator!=(const PollFlags &other) const {
return !(*this == other);
}
PollFlags operator|(const PollFlags other) const {
return from_raw(raw() | other.raw());
}
static PollFlags Write() {
return PollFlags(Flag::Write);
}
static PollFlags Error() {
return PollFlags(Flag::Error);
}
static PollFlags Close() {
return PollFlags(Flag::Close);
}
static PollFlags Read() {
return PollFlags(Flag::Read);
}
static PollFlags ReadWrite() {
return Read() | Write();
}
private:
enum class Flag : Raw { Write = 0x001, Read = 0x002, Close = 0x004, Error = 0x008, None = 0 };
Raw flags_{static_cast<Raw>(Flag::None)};
explicit PollFlags(Raw raw) : flags_(raw) {
}
explicit PollFlags(Flag flag) : PollFlags(static_cast<Raw>(flag)) {
}
PollFlags &add_flags(Raw flags) {
flags_ |= flags;
return *this;
}
PollFlags &remove_flags(Raw flags) {
flags_ &= ~flags;
return *this;
}
bool has_flags(Raw flags) const {
return (flags_ & flags) == flags;
}
};
StringBuilder &operator<<(StringBuilder &sb, PollFlags flags);
class PollFlagsSet {
public:
// write flags from any thread
// this is the only function that should be called from other threads
bool write_flags(PollFlags flags);
bool write_flags_local(PollFlags flags);
bool flush() const;
PollFlags read_flags() const;
PollFlags read_flags_local() const;
void clear_flags(PollFlags flags);
void clear();
private:
mutable std::atomic<PollFlags::Raw> to_write_{0};
mutable PollFlags flags_;
};
} // namespace td