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diff --git a/third_party/abseil_cpp/absl/synchronization/barrier.h b/third_party/abseil_cpp/absl/synchronization/barrier.h
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--- a/third_party/abseil_cpp/absl/synchronization/barrier.h
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-// 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.
-//
-// -----------------------------------------------------------------------------
-// barrier.h
-// -----------------------------------------------------------------------------
-
-#ifndef ABSL_SYNCHRONIZATION_BARRIER_H_
-#define ABSL_SYNCHRONIZATION_BARRIER_H_
-
-#include "absl/base/thread_annotations.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// Barrier
-//
-// This class creates a barrier which blocks threads until a prespecified
-// threshold of threads (`num_threads`) utilizes the barrier. A thread utilizes
-// the `Barrier` by calling `Block()` on the barrier, which will block that
-// thread; no call to `Block()` will return until `num_threads` threads have
-// called it.
-//
-// Exactly one call to `Block()` will return `true`, which is then responsible
-// for destroying the barrier; because stack allocation will cause the barrier
-// to be deleted when it is out of scope, barriers should not be stack
-// allocated.
-//
-// Example:
-//
-//   // Main thread creates a `Barrier`:
-//   barrier = new Barrier(num_threads);
-//
-//   // Each participating thread could then call:
-//   if (barrier->Block()) delete barrier;  // Exactly one call to `Block()`
-//                                          // returns `true`; that call
-//                                          // deletes the barrier.
-class Barrier {
- public:
-  // `num_threads` is the number of threads that will participate in the barrier
-  explicit Barrier(int num_threads)
-      : num_to_block_(num_threads), num_to_exit_(num_threads) {}
-
-  Barrier(const Barrier&) = delete;
-  Barrier& operator=(const Barrier&) = delete;
-
-  // Barrier::Block()
-  //
-  // Blocks the current thread, and returns only when the `num_threads`
-  // threshold of threads utilizing this barrier has been reached. `Block()`
-  // returns `true` for precisely one caller, which may then destroy the
-  // barrier.
-  //
-  // Memory ordering: For any threads X and Y, any action taken by X
-  // before X calls `Block()` will be visible to Y after Y returns from
-  // `Block()`.
-  bool Block();
-
- private:
-  Mutex lock_;
-  int num_to_block_ ABSL_GUARDED_BY(lock_);
-  int num_to_exit_ ABSL_GUARDED_BY(lock_);
-};
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-#endif  // ABSL_SYNCHRONIZATION_BARRIER_H_