121 lines
3.0 KiB
C++
121 lines
3.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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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/Select.h"
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char disable_linker_warning_about_empty_file_select_cpp TD_UNUSED;
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#ifdef TD_POLL_SELECT
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#include "td/utils/logging.h"
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#include <utility>
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namespace td {
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namespace detail {
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void Select::init() {
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FD_ZERO(&all_fd_);
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FD_ZERO(&read_fd_);
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FD_ZERO(&write_fd_);
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FD_ZERO(&except_fd_);
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max_fd_ = -1;
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}
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void Select::clear() {
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fds_.clear();
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}
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void Select::subscribe(PollableFd fd, PollFlags flags) {
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int native_fd = fd.native_fd().fd();
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for (auto &it : fds_) {
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CHECK(it.fd.native_fd().fd() != native_fd);
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}
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fds_.push_back(FdInfo{std::move(fd), flags});
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CHECK(0 <= native_fd && native_fd < FD_SETSIZE) << native_fd << " " << FD_SETSIZE;
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FD_SET(native_fd, &all_fd_);
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if (native_fd > max_fd_) {
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max_fd_ = native_fd;
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}
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}
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void Select::unsubscribe(PollableFdRef fd) {
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auto fd_locked = fd.lock();
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int native_fd = fd_locked.native_fd().fd();
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fd_locked.release_as_list_node();
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CHECK(0 <= native_fd && native_fd < FD_SETSIZE) << native_fd << " " << FD_SETSIZE;
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FD_CLR(native_fd, &all_fd_);
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FD_CLR(native_fd, &read_fd_);
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FD_CLR(native_fd, &write_fd_);
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FD_CLR(native_fd, &except_fd_);
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while (max_fd_ >= 0 && !FD_ISSET(max_fd_, &all_fd_)) {
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max_fd_--;
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}
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for (auto it = fds_.begin(); it != fds_.end();) {
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if (it->fd.native_fd().fd() == native_fd) {
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std::swap(*it, fds_.back());
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fds_.pop_back();
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break;
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} else {
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++it;
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}
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}
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}
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void Select::unsubscribe_before_close(PollableFdRef fd) {
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unsubscribe(fd);
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}
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void Select::run(int timeout_ms) {
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timeval timeout_data;
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timeval *timeout_ptr;
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if (timeout_ms == -1) {
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timeout_ptr = nullptr;
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} else {
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timeout_data.tv_sec = timeout_ms / 1000;
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timeout_data.tv_usec = timeout_ms % 1000 * 1000;
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timeout_ptr = &timeout_data;
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}
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for (auto &it : fds_) {
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int native_fd = it.fd.native_fd().fd();
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PollFlags fd_flags = it.fd.get_flags_unsafe(); // concurrent calls are UB
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if (it.flags.can_write() && !fd_flags.can_write()) {
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FD_SET(native_fd, &write_fd_);
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} else {
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FD_CLR(native_fd, &write_fd_);
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}
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if (it.flags.can_read() && !fd_flags.can_read()) {
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FD_SET(native_fd, &read_fd_);
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} else {
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FD_CLR(native_fd, &read_fd_);
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}
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FD_SET(native_fd, &except_fd_);
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}
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select(max_fd_ + 1, &read_fd_, &write_fd_, &except_fd_, timeout_ptr);
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for (auto &it : fds_) {
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int native_fd = it.fd.native_fd().fd();
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PollFlags flags;
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if (FD_ISSET(native_fd, &read_fd_)) {
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flags = flags | PollFlags::Read();
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}
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if (FD_ISSET(native_fd, &write_fd_)) {
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flags = flags | PollFlags::Write();
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}
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if (FD_ISSET(native_fd, &except_fd_)) {
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flags = flags | PollFlags::Error();
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}
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it.fd.add_flags(flags);
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}
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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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