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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.
*/
#include "mongo/stdx/exception.h"
#include <atomic>
#include <utility>
#if defined(_WIN32)
namespace mongo {
namespace stdx {
// `dispatch_impl` is circularly dependent with the initialization of `terminationHandler`, but
// should not have linkage. To facilitate matching the definition to the declaration, we make this
// function `static`, rather than placing it in the anonymous namespace.
[[noreturn]] static void dispatch_impl() noexcept;
namespace {
void uninitializedTerminateHandler() {}
::std::atomic<terminate_handler> terminationHandler(&uninitializedTerminateHandler); // NOLINT
void registerTerminationHook() noexcept {
const auto oldHandler =
terminationHandler.exchange(::std::set_terminate(&dispatch_impl)); // NOLINT
if (oldHandler != &uninitializedTerminateHandler)
std::abort(); // Someone set the handler, somehow before we got to initialize ourselves.
}
[[maybe_unused]] const int initializeTerminationHandler = []() noexcept {
registerTerminationHook();
return 0;
}();
} // namespace
} // namespace stdx
stdx::terminate_handler stdx::set_terminate(const stdx::terminate_handler handler) noexcept {
const auto oldHandler = terminationHandler.exchange(handler);
if (oldHandler == &uninitializedTerminateHandler)
std::abort(); // Do not let people set terminate before the initializer has run.
return oldHandler;
}
stdx::terminate_handler stdx::get_terminate() noexcept {
const auto currentHandler = terminationHandler.load();
if (currentHandler == &uninitializedTerminateHandler)
std::abort(); // Do not let people see the terminate handler before the initializer has
// run.
return currentHandler;
}
void stdx::dispatch_impl() noexcept {
if (const ::std::terminate_handler handler = terminationHandler.load())
handler();
// The standard says that returning from your handler is undefined. We may as well make the
// wrapper have stronger guarantees.
std::abort();
}
void stdx::TerminateHandlerDetailsInterface::dispatch() noexcept {
return stdx::dispatch_impl();
}
} // namespace mongo
#endif
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