fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 1 | // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "base/sequence_token.h" |
| 6 | |
| 7 | #include "base/atomic_sequence_num.h" |
| 8 | #include "base/lazy_instance.h" |
| 9 | #include "base/logging.h" |
| 10 | #include "base/threading/thread_local.h" |
| 11 | |
| 12 | namespace base { |
| 13 | |
| 14 | namespace { |
| 15 | |
tzik | 09af4da | 2017-07-20 12:24:57 +0900 | [diff] [blame] | 16 | base::AtomicSequenceNumber g_sequence_token_generator; |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 17 | |
tzik | 09af4da | 2017-07-20 12:24:57 +0900 | [diff] [blame] | 18 | base::AtomicSequenceNumber g_task_token_generator; |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 19 | |
| 20 | LazyInstance<ThreadLocalPointer<const SequenceToken>>::Leaky |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 21 | tls_current_sequence_token = LAZY_INSTANCE_INITIALIZER; |
| 22 | |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 23 | LazyInstance<ThreadLocalPointer<const TaskToken>>::Leaky |
| 24 | tls_current_task_token = LAZY_INSTANCE_INITIALIZER; |
| 25 | |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 26 | } // namespace |
| 27 | |
| 28 | bool SequenceToken::operator==(const SequenceToken& other) const { |
gab | 28cc554 | 2016-08-10 11:46:47 +0900 | [diff] [blame] | 29 | return token_ == other.token_ && IsValid(); |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | bool SequenceToken::operator!=(const SequenceToken& other) const { |
| 33 | return !(*this == other); |
| 34 | } |
| 35 | |
| 36 | bool SequenceToken::IsValid() const { |
| 37 | return token_ != kInvalidSequenceToken; |
| 38 | } |
| 39 | |
gab | 7bd8cc6 | 2016-10-07 06:16:24 +0900 | [diff] [blame] | 40 | int SequenceToken::ToInternalValue() const { |
| 41 | return token_; |
| 42 | } |
| 43 | |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 44 | SequenceToken SequenceToken::Create() { |
| 45 | return SequenceToken(g_sequence_token_generator.GetNext()); |
| 46 | } |
| 47 | |
| 48 | SequenceToken SequenceToken::GetForCurrentThread() { |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 49 | const SequenceToken* current_sequence_token = |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 50 | tls_current_sequence_token.Get().Get(); |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 51 | return current_sequence_token ? *current_sequence_token : SequenceToken(); |
| 52 | } |
| 53 | |
| 54 | bool TaskToken::operator==(const TaskToken& other) const { |
gab | 28cc554 | 2016-08-10 11:46:47 +0900 | [diff] [blame] | 55 | return token_ == other.token_ && IsValid(); |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | bool TaskToken::operator!=(const TaskToken& other) const { |
| 59 | return !(*this == other); |
| 60 | } |
| 61 | |
| 62 | bool TaskToken::IsValid() const { |
| 63 | return token_ != kInvalidTaskToken; |
| 64 | } |
| 65 | |
| 66 | TaskToken TaskToken::Create() { |
| 67 | return TaskToken(g_task_token_generator.GetNext()); |
| 68 | } |
| 69 | |
| 70 | TaskToken TaskToken::GetForCurrentThread() { |
| 71 | const TaskToken* current_task_token = tls_current_task_token.Get().Get(); |
| 72 | return current_task_token ? *current_task_token : TaskToken(); |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread( |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 76 | const SequenceToken& sequence_token) |
| 77 | : sequence_token_(sequence_token), task_token_(TaskToken::Create()) { |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 78 | DCHECK(!tls_current_sequence_token.Get().Get()); |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 79 | DCHECK(!tls_current_task_token.Get().Get()); |
| 80 | tls_current_sequence_token.Get().Set(&sequence_token_); |
| 81 | tls_current_task_token.Get().Set(&task_token_); |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | ScopedSetSequenceTokenForCurrentThread:: |
| 85 | ~ScopedSetSequenceTokenForCurrentThread() { |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 86 | DCHECK_EQ(tls_current_sequence_token.Get().Get(), &sequence_token_); |
| 87 | DCHECK_EQ(tls_current_task_token.Get().Get(), &task_token_); |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 88 | tls_current_sequence_token.Get().Set(nullptr); |
fdoray | 0f73bd9 | 2016-08-10 06:49:26 +0900 | [diff] [blame] | 89 | tls_current_task_token.Get().Set(nullptr); |
fdoray | 4bcf108 | 2016-07-27 07:28:45 +0900 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | } // namespace base |