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++
/*
|
|
This file is part of TON Blockchain Library.
|
|
|
|
TON Blockchain Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
TON Blockchain Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
Copyright 2017-2020 Telegram Systems LLP
|
|
*/
|
|
#include "td/utils/port/detail/Select.h"
|
|
|
|
char disable_linker_warning_about_empty_file_select_cpp TD_UNUSED;
|
|
|
|
#ifdef TD_POLL_SELECT
|
|
|
|
#include "td/utils/logging.h"
|
|
|
|
#include <utility>
|
|
|
|
namespace td {
|
|
namespace detail {
|
|
|
|
void Select::init() {
|
|
FD_ZERO(&all_fd_);
|
|
FD_ZERO(&read_fd_);
|
|
FD_ZERO(&write_fd_);
|
|
FD_ZERO(&except_fd_);
|
|
max_fd_ = -1;
|
|
}
|
|
|
|
void Select::clear() {
|
|
fds_.clear();
|
|
}
|
|
|
|
void Select::subscribe(PollableFd fd, PollFlags flags) {
|
|
int native_fd = fd.native_fd().fd();
|
|
for (auto &it : fds_) {
|
|
CHECK(it.fd.native_fd().fd() != native_fd);
|
|
}
|
|
fds_.push_back(FdInfo{std::move(fd), flags});
|
|
LOG_CHECK(0 <= native_fd && native_fd < FD_SETSIZE) << native_fd << " " << FD_SETSIZE;
|
|
FD_SET(native_fd, &all_fd_);
|
|
if (native_fd > max_fd_) {
|
|
max_fd_ = native_fd;
|
|
}
|
|
}
|
|
|
|
void Select::unsubscribe(PollableFdRef fd) {
|
|
auto fd_locked = fd.lock();
|
|
int native_fd = fd_locked.native_fd().fd();
|
|
fd_locked.release_as_list_node();
|
|
|
|
LOG_CHECK(0 <= native_fd && native_fd < FD_SETSIZE) << native_fd << " " << FD_SETSIZE;
|
|
FD_CLR(native_fd, &all_fd_);
|
|
FD_CLR(native_fd, &read_fd_);
|
|
FD_CLR(native_fd, &write_fd_);
|
|
FD_CLR(native_fd, &except_fd_);
|
|
while (max_fd_ >= 0 && !FD_ISSET(max_fd_, &all_fd_)) {
|
|
max_fd_--;
|
|
}
|
|
for (auto it = fds_.begin(); it != fds_.end();) {
|
|
if (it->fd.native_fd().fd() == native_fd) {
|
|
std::swap(*it, fds_.back());
|
|
fds_.pop_back();
|
|
break;
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Select::unsubscribe_before_close(PollableFdRef fd) {
|
|
unsubscribe(fd);
|
|
}
|
|
|
|
void Select::run(int timeout_ms) {
|
|
timeval timeout_data;
|
|
timeval *timeout_ptr;
|
|
if (timeout_ms == -1) {
|
|
timeout_ptr = nullptr;
|
|
} else {
|
|
timeout_data.tv_sec = timeout_ms / 1000;
|
|
timeout_data.tv_usec = timeout_ms % 1000 * 1000;
|
|
timeout_ptr = &timeout_data;
|
|
}
|
|
|
|
for (auto &it : fds_) {
|
|
int native_fd = it.fd.native_fd().fd();
|
|
PollFlags fd_flags = it.fd.get_flags_unsafe(); // concurrent calls are UB
|
|
if (it.flags.can_write() && !fd_flags.can_write()) {
|
|
FD_SET(native_fd, &write_fd_);
|
|
} else {
|
|
FD_CLR(native_fd, &write_fd_);
|
|
}
|
|
if (it.flags.can_read() && !fd_flags.can_read()) {
|
|
FD_SET(native_fd, &read_fd_);
|
|
} else {
|
|
FD_CLR(native_fd, &read_fd_);
|
|
}
|
|
FD_SET(native_fd, &except_fd_);
|
|
}
|
|
|
|
select(max_fd_ + 1, &read_fd_, &write_fd_, &except_fd_, timeout_ptr);
|
|
for (auto &it : fds_) {
|
|
int native_fd = it.fd.native_fd().fd();
|
|
PollFlags flags;
|
|
if (FD_ISSET(native_fd, &read_fd_)) {
|
|
flags = flags | PollFlags::Read();
|
|
}
|
|
if (FD_ISSET(native_fd, &write_fd_)) {
|
|
flags = flags | PollFlags::Write();
|
|
}
|
|
if (FD_ISSET(native_fd, &except_fd_)) {
|
|
flags = flags | PollFlags::Error();
|
|
}
|
|
it.fd.add_flags(flags);
|
|
}
|
|
}
|
|
|
|
} // namespace detail
|
|
} // namespace td
|
|
|
|
#endif
|