| /* |
| * Copyright 2017 The Abseil Authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Interface for getting the current ThreadIdentity, creating one if necessary. |
| // See thread_identity.h. |
| // |
| // This file is separate from thread_identity.h because creating a new |
| // ThreadIdentity requires slightly higher level libraries (per_thread_sem |
| // and low_level_alloc) than accessing an existing one. This separation allows |
| // us to have a smaller //absl/base:base. |
| |
| #ifndef ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_ |
| #define ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_ |
| |
| #include "absl/base/internal/thread_identity.h" |
| #include "absl/base/port.h" |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| namespace synchronization_internal { |
| |
| // Allocates and attaches a ThreadIdentity object for the calling thread. |
| // For private use only. |
| base_internal::ThreadIdentity* CreateThreadIdentity(); |
| |
| // A per-thread destructor for reclaiming associated ThreadIdentity objects. |
| // For private use only. |
| void ReclaimThreadIdentity(void* v); |
| |
| // Returns the ThreadIdentity object representing the calling thread; guaranteed |
| // to be unique for its lifetime. The returned object will remain valid for the |
| // program's lifetime; although it may be re-assigned to a subsequent thread. |
| // If one does not exist for the calling thread, allocate it now. |
| inline base_internal::ThreadIdentity* GetOrCreateCurrentThreadIdentity() { |
| base_internal::ThreadIdentity* identity = |
| base_internal::CurrentThreadIdentityIfPresent(); |
| if (ABSL_PREDICT_FALSE(identity == nullptr)) { |
| return CreateThreadIdentity(); |
| } |
| return identity; |
| } |
| |
| } // namespace synchronization_internal |
| ABSL_NAMESPACE_END |
| } // namespace absl |
| |
| #endif // ABSL_SYNCHRONIZATION_INTERNAL_CREATE_THREAD_IDENTITY_H_ |