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