mirror of
https://github.com/ton-blockchain/ton
synced 2025-02-13 03:32:22 +00:00
9f008b129f
- added new fift/func code for validator complaint creation - bugfixes in validator - updates in tonlib - new versions of rocksdb/abseil - hardfork support
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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This file is part of TON Blockchain source code.
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TON Blockchain is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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TON Blockchain 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with TON Blockchain. If not, see <http://www.gnu.org/licenses/>.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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You must obey the GNU General Public License in all respects for all
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of the code used other than OpenSSL. If you modify file(s) with this
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exception, you may extend this exception to your version of the file(s),
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but you are not obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. If you delete this exception statement
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from all source files in the program, then also delete it here.
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Copyright 2019-2020 Telegram Systems LLP
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*/
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#include <atomic>
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#include "td/utils/common.h"
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#include "td/utils/port/thread.h"
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namespace td {
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template <class T>
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class AtomicRead {
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public:
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void read(T &dest) const {
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while (true) {
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static_assert(std::is_trivially_copyable<T>::value, "T must be trivially copyable");
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auto version_before = version.load();
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memcpy(&dest, &value, sizeof(dest));
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auto version_after = version.load();
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if (version_before == version_after && version_before % 2 == 0) {
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break;
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}
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td::this_thread::yield();
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}
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}
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friend struct Write;
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struct Write {
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explicit Write(AtomicRead *read) {
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read->do_lock();
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ptr.reset(read);
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}
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struct Destructor {
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void operator()(AtomicRead *read) const {
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read->do_unlock();
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}
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};
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T &operator*() {
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return value();
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}
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T *operator->() {
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return &value();
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}
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T &value() {
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CHECK(ptr);
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return ptr->value;
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}
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private:
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std::unique_ptr<AtomicRead, Destructor> ptr;
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};
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Write lock() {
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return Write(this);
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}
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private:
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std::atomic<td::uint64> version{0};
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T value;
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void do_lock() {
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CHECK(++version % 2 == 1);
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}
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void do_unlock() {
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CHECK(++version % 2 == 0);
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}
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};
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}; // namespace td
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