648db22b |
1 | /* |
2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
3 | * All rights reserved. |
4 | * |
5 | * This source code is licensed under both the BSD-style license (found in the |
6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
7 | * in the COPYING file in the root directory of this source tree). |
8 | */ |
9 | #pragma once |
10 | |
11 | #include <atomic> |
12 | #include <cassert> |
13 | #include <stdexcept> |
14 | #include <string> |
15 | |
16 | namespace pzstd { |
17 | |
18 | // Coordinates graceful shutdown of the pzstd pipeline |
19 | class ErrorHolder { |
20 | std::atomic<bool> error_; |
21 | std::string message_; |
22 | |
23 | public: |
24 | ErrorHolder() : error_(false) {} |
25 | |
26 | bool hasError() noexcept { |
27 | return error_.load(); |
28 | } |
29 | |
30 | void setError(std::string message) noexcept { |
31 | // Given multiple possibly concurrent calls, exactly one will ever succeed. |
32 | bool expected = false; |
33 | if (error_.compare_exchange_strong(expected, true)) { |
34 | message_ = std::move(message); |
35 | } |
36 | } |
37 | |
38 | bool check(bool predicate, std::string message) noexcept { |
39 | if (!predicate) { |
40 | setError(std::move(message)); |
41 | } |
42 | return !hasError(); |
43 | } |
44 | |
45 | std::string getError() noexcept { |
46 | error_.store(false); |
47 | return std::move(message_); |
48 | } |
49 | |
50 | ~ErrorHolder() { |
51 | assert(!hasError()); |
52 | } |
53 | }; |
54 | } |