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author | Vincent Ambo <tazjin@google.com> | 2020-05-20T01·32+0100 |
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committer | Vincent Ambo <tazjin@google.com> | 2020-05-20T01·32+0100 |
commit | fc8dc48020ac5b52731d0828a96ea4d2526c77ba (patch) | |
tree | 353204eea3268095a9ad3f5345720f32c2615c69 /third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h | |
parent | ffb2ae54beb5796cd408fbe15d2d2da09ff37adf (diff) | |
parent | 768eb2ca2857342673fcd462792ce04b8bac3fa3 (diff) |
Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3' r/781
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline: ffb2ae54beb5796cd408fbe15d2d2da09ff37adf git-subtree-split: 768eb2ca2857342673fcd462792ce04b8bac3fa3
Diffstat (limited to 'third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h')
-rw-r--r-- | third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h b/third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h new file mode 100644 index 000000000000..e121f68377b1 --- /dev/null +++ b/third_party/abseil_cpp/absl/synchronization/internal/create_thread_identity.h @@ -0,0 +1,60 @@ +/* + * 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_ |