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