OLD | NEW |
(Empty) | |
| 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 namespace internal { |
| 14 |
| 15 namespace { |
| 16 |
| 17 base::StaticAtomicSequenceNumber g_sequence_token_generator; |
| 18 |
| 19 LazyInstance<ThreadLocalPointer<ScopedSetCurrentSequenceToken>>::Leaky |
| 20 tls_current_sequence_token = LAZY_INSTANCE_INITIALIZER; |
| 21 |
| 22 } // namespace |
| 23 |
| 24 bool SequenceToken::operator==(const SequenceToken& other) const { |
| 25 return token_ == other.token_; |
| 26 } |
| 27 |
| 28 bool SequenceToken::operator!=(const SequenceToken& other) const { |
| 29 return !(*this == other); |
| 30 } |
| 31 |
| 32 bool SequenceToken::IsValid() const { |
| 33 return token_ != kInvalidSequenceToken; |
| 34 } |
| 35 |
| 36 SequenceToken SequenceToken::Create() { |
| 37 return SequenceToken(g_sequence_token_generator.GetNext()); |
| 38 } |
| 39 |
| 40 SequenceToken SequenceToken::GetCurrent() { |
| 41 const ScopedSetCurrentSequenceToken* current_sequence_token = |
| 42 tls_current_sequence_token.Get().Get(); |
| 43 return current_sequence_token ? current_sequence_token->token_ |
| 44 : SequenceToken(); |
| 45 } |
| 46 |
| 47 ScopedSetCurrentSequenceToken::ScopedSetCurrentSequenceToken( |
| 48 const SequenceToken& token) |
| 49 : token_(token) { |
| 50 DCHECK(!tls_current_sequence_token.Get().Get()); |
| 51 tls_current_sequence_token.Get().Set(this); |
| 52 } |
| 53 |
| 54 ScopedSetCurrentSequenceToken::~ScopedSetCurrentSequenceToken() { |
| 55 DCHECK_EQ(tls_current_sequence_token.Get().Get(), this); |
| 56 tls_current_sequence_token.Get().Set(nullptr); |
| 57 } |
| 58 |
| 59 } // namespace internal |
| 60 } // namespace base |
OLD | NEW |