95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
// Copyright (c) 2014-2017, The Monero Project, The Danicoin Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "common/task_region.h"
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#include <boost/thread/locks.hpp>
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#include <cassert>
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/* `mark_completed` and `wait` can throw in the lock call, but its difficult to
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recover from either. An exception in `wait` means the post condition of joining
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all threads cannot be achieved, and an exception in `mark_completed` means
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certain deadlock. `noexcept` qualifier will force a call to `std::terminate` if
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locking throws an exception, which should only happen if a recursive lock
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attempt is made (which is not possible since no external function is called
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while holding the lock). */
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namespace tools
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{
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void task_region_handle::state::mark_completed(id task_id) noexcept {
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assert(task_id != 0 && (task_id & (task_id - 1)) == 0); // power of 2 check
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if (pending.fetch_and(~task_id) == task_id) {
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// synchronize with wait call, but do not need to hold
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boost::unique_lock<boost::mutex>{sync_on_complete};
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all_complete.notify_all();
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}
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}
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void task_region_handle::state::abort() noexcept {
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state* current = this;
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while (current) {
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current->ready = 0;
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current = current->next.get();
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}
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}
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void task_region_handle::state::wait() noexcept {
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state* current = this;
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while (current) {
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{
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boost::unique_lock<boost::mutex> lock{current->sync_on_complete};
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current->all_complete.wait(lock, [current] { return current->pending == 0; });
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}
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current = current->next.get();
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}
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}
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void task_region_handle::state::wait(thread_group& threads) noexcept {
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state* current = this;
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while (current) {
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while (current->pending != 0) {
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if (!threads.try_run_one()) {
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current->wait();
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return;
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}
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}
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current = current->next.get();
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}
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}
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void task_region_handle::create_state() {
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st = std::make_shared<state>(std::move(st));
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next_id = 1;
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}
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void task_region_handle::do_wait() noexcept {
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assert(st);
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const std::shared_ptr<state> temp = std::move(st);
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temp->wait(threads);
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}
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}
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