131 lines
4.0 KiB
C++
131 lines
4.0 KiB
C++
/*
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* Copyright (c) 2017 - 2018, Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "runtime/event/async_events_handler.h"
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#include "runtime/event/event.h"
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#include "runtime/os_interface/os_thread.h"
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#include <iterator>
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namespace OCLRT {
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AsyncEventsHandler::AsyncEventsHandler() {
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allowAsyncProcess = false;
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registerList.reserve(64);
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list.reserve(64);
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pendingList.reserve(64);
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}
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AsyncEventsHandler::~AsyncEventsHandler() {
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closeThread();
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}
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void AsyncEventsHandler::registerEvent(Event *event) {
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std::unique_lock<std::mutex> lock(asyncMtx);
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//Create on first use
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openThread();
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event->incRefInternal();
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registerList.push_back(event);
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asyncCond.notify_one();
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}
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Event *AsyncEventsHandler::processList() {
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uint32_t lowestTaskCount = Event::eventNotReady;
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Event *sleepCandidate = nullptr;
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pendingList.clear();
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for (auto event : list) {
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event->updateExecutionStatus();
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if (event->peekHasCallbacks() || (event->isExternallySynchronized() && (event->peekExecutionStatus() > CL_COMPLETE))) {
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pendingList.push_back(event);
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if (event->peekTaskCount() < lowestTaskCount) {
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sleepCandidate = event;
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lowestTaskCount = event->peekTaskCount();
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}
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} else {
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event->decRefInternal();
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}
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}
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list.swap(pendingList);
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return sleepCandidate;
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}
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void *AsyncEventsHandler::asyncProcess(void *arg) {
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auto self = reinterpret_cast<AsyncEventsHandler *>(arg);
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std::unique_lock<std::mutex> lock(self->asyncMtx, std::defer_lock);
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Event *sleepCandidate = nullptr;
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while (true) {
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lock.lock();
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self->transferRegisterList();
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if (!self->allowAsyncProcess) {
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self->processList();
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self->releaseEvents();
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break;
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}
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if (self->list.empty()) {
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self->asyncCond.wait(lock);
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}
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lock.unlock();
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sleepCandidate = self->processList();
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if (sleepCandidate) {
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sleepCandidate->wait(true, true);
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}
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std::this_thread::yield();
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}
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return nullptr;
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}
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void AsyncEventsHandler::closeThread() {
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std::unique_lock<std::mutex> lock(asyncMtx);
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if (allowAsyncProcess) {
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allowAsyncProcess = false;
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asyncCond.notify_one();
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lock.unlock();
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thread.get()->join();
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thread.reset(nullptr);
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}
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}
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void AsyncEventsHandler::openThread() {
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if (!thread.get()) {
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DEBUG_BREAK_IF(allowAsyncProcess);
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allowAsyncProcess = true;
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thread = Thread::create(asyncProcess, reinterpret_cast<void *>(this));
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}
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}
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void AsyncEventsHandler::transferRegisterList() {
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std::move(registerList.begin(), registerList.end(), std::back_inserter(list));
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registerList.clear();
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}
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void AsyncEventsHandler::releaseEvents() {
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for (auto event : list) {
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event->decRefInternal();
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}
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list.clear();
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UNRECOVERABLE_IF(!registerList.empty()) // transferred before release
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}
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} // namespace OCLRT
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