75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2017
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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/detail/EventFdLinux.h"
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char disable_linker_warning_about_empty_file_event_fd_linux_cpp TD_UNUSED;
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#ifdef TD_EVENTFD_LINUX
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#include "td/utils/logging.h"
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#include "td/utils/Slice.h"
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#include <sys/eventfd.h>
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namespace td {
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namespace detail {
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void EventFdLinux::init() {
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int fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
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auto eventfd_errno = errno;
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LOG_IF(FATAL, fd == -1) << Status::PosixError(eventfd_errno, "eventfd call failed");
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fd_ = Fd(fd, Fd::Mode::Owner);
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}
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bool EventFdLinux::empty() {
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return fd_.empty();
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}
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void EventFdLinux::close() {
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fd_.close();
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}
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Status EventFdLinux::get_pending_error() {
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return Status::OK();
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}
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const Fd &EventFdLinux::get_fd() const {
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return fd_;
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}
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Fd &EventFdLinux::get_fd() {
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return fd_;
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}
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void EventFdLinux::release() {
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const uint64 value = 1;
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// NB: write_unsafe is used, because release will be called from multiple threads
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auto result = fd_.write_unsafe(Slice(reinterpret_cast<const char *>(&value), sizeof(value)));
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if (result.is_error()) {
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LOG(FATAL) << "EventFdLinux write failed: " << result.error();
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}
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size_t size = result.ok();
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if (size != sizeof(value)) {
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LOG(FATAL) << "EventFdLinux write returned " << value << " instead of " << sizeof(value);
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}
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}
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void EventFdLinux::acquire() {
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uint64 res;
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auto result = fd_.read(MutableSlice(reinterpret_cast<char *>(&res), sizeof(res)));
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if (result.is_error()) {
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LOG(FATAL) << "EventFdLinux read failed: " << result.error();
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}
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fd_.clear_flags(Fd::Read);
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}
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} // namespace detail
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} // namespace td
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#endif
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