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/**
* Copyright (C) 2018-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/transport/service_entry_point_utils.h"
#include <functional>
#include <memory>
#include "mongo/logv2/log.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/debug_util.h"
#include "mongo/util/thread_safety_context.h"
#if !defined(_WIN32)
#include <sys/resource.h>
#endif
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif
namespace mongo {
namespace {
void* runFunc(void* ctx) {
std::unique_ptr<std::function<void()>> taskPtr(static_cast<std::function<void()>*>(ctx));
(*taskPtr)();
return nullptr;
}
} // namespace
Status launchServiceWorkerThread(std::function<void()> task) {
try {
#if defined(_WIN32)
stdx::thread(std::move(task)).detach();
#else
pthread_attr_t attrs;
pthread_attr_init(&attrs);
pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
static const rlim_t kStackSize =
1024 * 1024; // if we change this we need to update the warning
struct rlimit limits;
invariant(getrlimit(RLIMIT_STACK, &limits) == 0);
if (limits.rlim_cur > kStackSize) {
size_t stackSizeToSet = kStackSize;
#if !__has_feature(address_sanitizer)
if (kDebugBuild)
stackSizeToSet /= 2;
#endif
int failed = pthread_attr_setstacksize(&attrs, stackSizeToSet);
if (failed) {
const auto ewd = errnoWithDescription(failed);
LOGV2_WARNING(22949, "pthread_attr_setstacksize failed: {ewd}", "ewd"_attr = ewd);
}
} else if (limits.rlim_cur < 1024 * 1024) {
LOGV2_WARNING(22950,
"Stack size set to {limits_rlim_cur_1024}KB. We suggest 1MB",
"limits_rlim_cur_1024"_attr = (limits.rlim_cur / 1024));
}
// Wrap the user-specified `task` so it runs with an installed `sigaltstack`.
task = [sigAltStackController = std::make_shared<stdx::support::SigAltStackController>(),
f = std::move(task)] {
auto sigAltStackGuard = sigAltStackController->makeInstallGuard();
f();
};
pthread_t thread;
auto ctx = std::make_unique<std::function<void()>>(std::move(task));
ThreadSafetyContext::getThreadSafetyContext()->onThreadCreate();
int failed = pthread_create(&thread, &attrs, runFunc, ctx.get());
pthread_attr_destroy(&attrs);
if (failed) {
LOGV2(22948,
"pthread_create failed: {errnoWithDescription_failed}",
"errnoWithDescription_failed"_attr = errnoWithDescription(failed));
throw std::system_error(
std::make_error_code(std::errc::resource_unavailable_try_again));
}
ctx.release();
#endif
} catch (...) {
return {ErrorCodes::InternalError, "failed to create service entry worker thread"};
}
return Status::OK();
}
} // namespace mongo
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