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/*
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
*/
#pragma once
#include <atomic>
#include <cassert>
#include <stdexcept>
#include <string>
namespace pzstd {
// Coordinates graceful shutdown of the pzstd pipeline
class ErrorHolder {
std::atomic<bool> error_;
std::string message_;
public:
ErrorHolder() : error_(false) {}
bool hasError() noexcept {
return error_.load();
}
void setError(std::string message) noexcept {
// Given multiple possibly concurrent calls, exactly one will ever succeed.
bool expected = false;
if (error_.compare_exchange_strong(expected, true)) {
message_ = std::move(message);
}
}
bool check(bool predicate, std::string message) noexcept {
if (!predicate) {
setError(std::move(message));
}
return !hasError();
}
std::string getError() noexcept {
error_.store(false);
return std::move(message_);
}
~ErrorHolder() {
assert(!hasError());
}
};
}
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