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/**
* 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_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::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 {
namespace {
const auto kDetached = Status(ErrorCodes::ShutdownInProgress, "Baton detached");
} // namespace
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<Latch> lk(_mutex);
invariant(_opCtx->getBaton().get() == this);
_opCtx->setBaton(nullptr);
_opCtx = nullptr;
_hasIngressSocket = false;
using std::swap;
swap(_scheduled, scheduled);
}
for (auto& job : scheduled) {
job(kDetached);
}
}
void DefaultBaton::schedule(Task func) noexcept {
stdx::unique_lock<Latch> lk(_mutex);
if (!_opCtx) {
lk.unlock();
func(kDetached);
return;
}
_scheduled.push_back(std::move(func));
if (_sleeping && !_notified) {
_notified = true;
_cv.notify_one();
}
}
void DefaultBaton::notify() noexcept {
stdx::lock_guard<Latch> lk(_mutex);
_notified = true;
_cv.notify_one();
}
Waitable::TimeoutState DefaultBaton::run_until(ClockSource* clkSource,
Date_t oldDeadline) noexcept {
stdx::unique_lock<Latch> 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(Status::OK());
}
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
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