create_thread_identity.h
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1 /*
2  * Copyright 2017 The Abseil Authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * https://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 // Interface for getting the current ThreadIdentity, creating one if necessary.
18 // See thread_identity.h.
19 //
20 // This file is separate from thread_identity.h because creating a new
21 // ThreadIdentity requires slightly higher level libraries (per_thread_sem
22 // and low_level_alloc) than accessing an existing one. This separation allows
23 // us to have a smaller //absl/base:base.
24 
25 #ifndef ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
26 #define ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
27 
29 #include "absl/base/port.h"
30 
31 namespace absl {
32 namespace synchronization_internal {
33 
34 // Allocates and attaches a ThreadIdentity object for the calling thread.
35 // For private use only.
36 base_internal::ThreadIdentity* CreateThreadIdentity();
37 
38 // Returns the ThreadIdentity object representing the calling thread; guaranteed
39 // to be unique for its lifetime. The returned object will remain valid for the
40 // program's lifetime; although it may be re-assigned to a subsequent thread.
41 // If one does not exist for the calling thread, allocate it now.
45  if (ABSL_PREDICT_FALSE(identity == nullptr)) {
46  return CreateThreadIdentity();
47  }
48  return identity;
49 }
50 
51 } // namespace synchronization_internal
52 } // namespace absl
53 
54 #endif // ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_
#define ABSL_PREDICT_FALSE(x)
Definition: optimization.h:177
base_internal::ThreadIdentity * GetOrCreateCurrentThreadIdentity()
ThreadIdentity * CurrentThreadIdentityIfPresent()
Definition: algorithm.h:29
base_internal::ThreadIdentity * CreateThreadIdentity()


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autogenerated on Tue Jun 18 2019 19:44:35