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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kExecutor
#include "mongo/transport/service_executor_fixed.h"
#include "mongo/base/error_codes.h"
#include "mongo/logv2/log.h"
#include "mongo/transport/service_executor_gen.h"
#include "mongo/util/fail_point.h"
namespace mongo {
MONGO_FAIL_POINT_DEFINE(hangBeforeSchedulingServiceExecutorFixedTask);
namespace transport {
namespace {
constexpr auto kThreadsRunning = "threadsRunning"_sd;
constexpr auto kExecutorLabel = "executor"_sd;
constexpr auto kExecutorName = "fixed"_sd;
} // namespace
ServiceExecutorFixed::ServiceExecutorFixed(ThreadPool::Options options)
: _options(std::move(options)) {
_options.onCreateThread =
[this, onCreate = std::move(_options.onCreateThread)](const std::string& name) mutable {
_executorContext = std::make_unique<ExecutorThreadContext>(this->weak_from_this());
onCreate(name);
};
_threadPool = std::make_unique<ThreadPool>(_options);
}
ServiceExecutorFixed::~ServiceExecutorFixed() {
invariant(!_canScheduleWork.load());
if (_state == State::kNotStarted)
return;
// Ensures we always call "shutdown" after staring the service executor
invariant(_state == State::kStopped);
_threadPool->shutdown();
_threadPool->join();
invariant(_numRunningExecutorThreads.load() == 0);
}
Status ServiceExecutorFixed::start() {
stdx::lock_guard<Latch> lk(_mutex);
auto oldState = std::exchange(_state, State::kRunning);
invariant(oldState == State::kNotStarted);
_threadPool->startup();
_canScheduleWork.store(true);
LOGV2_DEBUG(
4910501, 3, "Started fixed thread-pool service executor", "name"_attr = _options.poolName);
return Status::OK();
}
Status ServiceExecutorFixed::shutdown(Milliseconds timeout) {
auto waitForShutdown = [&]() mutable -> Status {
stdx::unique_lock<Latch> lk(_mutex);
bool success = _shutdownCondition.wait_for(lk, timeout.toSystemDuration(), [this] {
return _numRunningExecutorThreads.load() == 0;
});
return success ? Status::OK()
: Status(ErrorCodes::ExceededTimeLimit,
"Failed to shutdown all executor threads within the time limit");
};
LOGV2_DEBUG(4910502,
3,
"Shutting down fixed thread-pool service executor",
"name"_attr = _options.poolName);
{
stdx::lock_guard<Latch> lk(_mutex);
_canScheduleWork.store(false);
auto oldState = std::exchange(_state, State::kStopped);
if (oldState != State::kStopped) {
_threadPool->shutdown();
}
}
return waitForShutdown();
}
Status ServiceExecutorFixed::schedule(Task task, ScheduleFlags flags) {
if (!_canScheduleWork.load()) {
return Status(ErrorCodes::ShutdownInProgress, "Executor is not running");
}
auto mayExecuteTaskInline = [&] {
if (!(flags & ScheduleFlags::kMayRecurse))
return false;
if (!_executorContext)
return false;
return true;
};
if (mayExecuteTaskInline()) {
invariant(_executorContext);
if (_executorContext->getRecursionDepth() <
fixedServiceExecutorRecursionLimit.loadRelaxed()) {
// Recursively executing the task on the executor thread.
_executorContext->run(std::move(task));
return Status::OK();
}
}
hangBeforeSchedulingServiceExecutorFixedTask.pauseWhileSet();
// May throw if an attempt is made to schedule after the thread pool is shutdown.
try {
_threadPool->schedule([task = std::move(task)](Status status) mutable {
internalAssert(status);
invariant(_executorContext);
_executorContext->run(std::move(task));
});
} catch (DBException& e) {
return e.toStatus();
}
return Status::OK();
}
void ServiceExecutorFixed::appendStats(BSONObjBuilder* bob) const {
*bob << kExecutorLabel << kExecutorName << kThreadsRunning
<< static_cast<int>(_numRunningExecutorThreads.load());
}
} // namespace transport
} // namespace mongo
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