72 lines
1.6 KiB
C++
72 lines
1.6 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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#include "td/utils/port/PollFlags.h"
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namespace td {
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bool PollFlagsSet::write_flags(PollFlags flags) {
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if (flags.empty()) {
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return false;
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}
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auto old_flags = to_write_.fetch_or(flags.raw(), std::memory_order_relaxed);
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return (flags.raw() & ~old_flags) != 0;
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}
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bool PollFlagsSet::write_flags_local(PollFlags flags) {
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return flags_.add_flags(flags);
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}
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bool PollFlagsSet::flush() const {
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if (to_write_.load(std::memory_order_relaxed) == 0) {
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return false;
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}
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auto to_write = to_write_.exchange(0, std::memory_order_relaxed);
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auto old_flags = flags_;
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flags_.add_flags(PollFlags::from_raw(to_write));
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if (flags_.can_close()) {
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flags_.remove_flags(PollFlags::Write());
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}
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return flags_ != old_flags;
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}
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PollFlags PollFlagsSet::read_flags() const {
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flush();
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return flags_;
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}
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PollFlags PollFlagsSet::read_flags_local() const {
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return flags_;
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}
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void PollFlagsSet::clear_flags(PollFlags flags) {
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flags_.remove_flags(flags);
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}
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void PollFlagsSet::clear() {
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to_write_ = 0;
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flags_ = {};
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}
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StringBuilder &operator<<(StringBuilder &sb, PollFlags flags) {
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sb << '[';
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if (flags.can_read()) {
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sb << 'R';
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}
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if (flags.can_write()) {
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sb << 'W';
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}
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if (flags.can_close()) {
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sb << 'C';
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}
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if (flags.has_pending_error()) {
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sb << 'E';
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}
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return sb << ']';
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}
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} // namespace td
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