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author | Jason Carey <jcarey@argv.me> | 2019-01-23 13:18:49 -0500 |
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committer | Jason Carey <jcarey@argv.me> | 2019-02-05 22:41:49 -0500 |
commit | a23cdb1bd0f8fbe9cd79db08a24b8a89dc54ff81 (patch) | |
tree | 1adc2fdb36e6c8babaab134d53f84de3020c2404 /src/mongo/db/default_baton.cpp | |
parent | 5fd66f15797c45c9bab7b59f9e55e0a2f7ad5cd0 (diff) | |
download | mongo-a23cdb1bd0f8fbe9cd79db08a24b8a89dc54ff81.tar.gz |
SERVER-39146 Refactor Baton
Refactor the baton into regular and networking batons while also
cleaning up the basic baton implementation.
Diffstat (limited to 'src/mongo/db/default_baton.cpp')
-rw-r--r-- | src/mongo/db/default_baton.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/mongo/db/default_baton.cpp b/src/mongo/db/default_baton.cpp new file mode 100644 index 00000000000..9855957135a --- /dev/null +++ b/src/mongo/db/default_baton.cpp @@ -0,0 +1,154 @@ + +/** + * Copyright (C) 2019-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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault + +#include "mongo/platform/basic.h" + +#include "mongo/db/default_baton.h" + +#include "mongo/db/operation_context.h" +#include "mongo/util/scopeguard.h" + +namespace mongo { + +DefaultBaton::DefaultBaton(OperationContext* opCtx) : _opCtx(opCtx) {} + +DefaultBaton::~DefaultBaton() { + invariant(!_opCtx); + invariant(_scheduled.empty()); +} + +void DefaultBaton::markKillOnClientDisconnect() noexcept { + if (_opCtx->getClient() && _opCtx->getClient()->session()) { + _hasIngressSocket = true; + } +} + +void DefaultBaton::detachImpl() noexcept { + decltype(_scheduled) scheduled; + + { + stdx::lock_guard<stdx::mutex> lk(_mutex); + + { + stdx::lock_guard<Client> lk(*_opCtx->getClient()); + invariant(_opCtx->getBaton().get() == this); + _opCtx->setBaton(nullptr); + } + + _opCtx = nullptr; + _hasIngressSocket = false; + + using std::swap; + swap(_scheduled, scheduled); + } + + for (auto& job : scheduled) { + job(nullptr); + } +} + +void DefaultBaton::schedule(unique_function<void(OperationContext*)> func) noexcept { + stdx::unique_lock<stdx::mutex> lk(_mutex); + + if (!_opCtx) { + lk.unlock(); + func(nullptr); + + return; + } + + _scheduled.push_back(std::move(func)); + + if (_sleeping && !_notified) { + _notified = true; + _cv.notify_one(); + } +} + +void DefaultBaton::notify() noexcept { + stdx::lock_guard<stdx::mutex> lk(_mutex); + _notified = true; + _cv.notify_one(); +} + +Waitable::TimeoutState DefaultBaton::run_until(ClockSource* clkSource, + Date_t oldDeadline) noexcept { + stdx::unique_lock<stdx::mutex> lk(_mutex); + + // We'll fulfill promises and run jobs on the way out, ensuring we don't hold any locks + const auto guard = makeGuard([&] { + // While we have scheduled work, keep running jobs + while (_scheduled.size()) { + auto toRun = std::exchange(_scheduled, {}); + + lk.unlock(); + for (auto& job : toRun) { + job(_opCtx); + } + lk.lock(); + } + }); + + // If anything was scheduled, run it now. + if (_scheduled.size()) { + return Waitable::TimeoutState::NoTimeout; + } + + auto newDeadline = oldDeadline; + + // If we have an ingress socket, sleep no more than 1 second (so we poll for closure in the + // outside opCtx waitForConditionOrInterruptUntil implementation) + if (_hasIngressSocket) { + newDeadline = std::min(oldDeadline, clkSource->now() + Seconds(1)); + } + + // we mark sleeping, so that we receive notifications + _sleeping = true; + + // while we're not notified + auto notified = + clkSource->waitForConditionUntil(_cv, lk, newDeadline, [&] { return _notified; }); + + _sleeping = false; + _notified = false; + + // If we've been notified, or we haven't timed out yet, return as if by spurious wakeup. + // Otherwise call it a timeout. + return (notified || (clkSource->now() < oldDeadline)) ? Waitable::TimeoutState::NoTimeout + : Waitable::TimeoutState::Timeout; +} + +void DefaultBaton::run(ClockSource* clkSource) noexcept { + run_until(clkSource, Date_t::max()); +} + +} // namespace mongo |