mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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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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LOG_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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LOG_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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