From 5aa5d282eac56a21e74611c1cdbaa97bb5db2dca Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Tue, 8 Feb 2022 02:05:36 +0300 Subject: chore(3p/abseil_cpp): unvendor abseil_cpp we weren't actually using these sources anymore, okay? Change-Id: If701571d9716de308d3512e1eb22c35db0877a66 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248 Tested-by: BuildkiteCI Reviewed-by: grfn Autosubmit: tazjin --- .../absl/synchronization/blocking_counter.h | 99 ---------------------- 1 file changed, 99 deletions(-) delete mode 100644 third_party/abseil_cpp/absl/synchronization/blocking_counter.h (limited to 'third_party/abseil_cpp/absl/synchronization/blocking_counter.h') diff --git a/third_party/abseil_cpp/absl/synchronization/blocking_counter.h b/third_party/abseil_cpp/absl/synchronization/blocking_counter.h deleted file mode 100644 index 1f53f9f24045..000000000000 --- a/third_party/abseil_cpp/absl/synchronization/blocking_counter.h +++ /dev/null @@ -1,99 +0,0 @@ -// -// 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. -// -// ----------------------------------------------------------------------------- -// blocking_counter.h -// ----------------------------------------------------------------------------- - -#ifndef ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_ -#define ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_ - -#include "absl/base/thread_annotations.h" -#include "absl/synchronization/mutex.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// BlockingCounter -// -// This class allows a thread to block for a pre-specified number of actions. -// `BlockingCounter` maintains a single non-negative abstract integer "count" -// with an initial value `initial_count`. A thread can then call `Wait()` on -// this blocking counter to block until the specified number of events occur; -// worker threads then call 'DecrementCount()` on the counter upon completion of -// their work. Once the counter's internal "count" reaches zero, the blocked -// thread unblocks. -// -// A `BlockingCounter` requires the following: -// - its `initial_count` is non-negative. -// - the number of calls to `DecrementCount()` on it is at most -// `initial_count`. -// - `Wait()` is called at most once on it. -// -// Given the above requirements, a `BlockingCounter` provides the following -// guarantees: -// - Once its internal "count" reaches zero, no legal action on the object -// can further change the value of "count". -// - When `Wait()` returns, it is legal to destroy the `BlockingCounter`. -// - When `Wait()` returns, the number of calls to `DecrementCount()` on -// this blocking counter exactly equals `initial_count`. -// -// Example: -// BlockingCounter bcount(N); // there are N items of work -// ... Allow worker threads to start. -// ... On completing each work item, workers do: -// ... bcount.DecrementCount(); // an item of work has been completed -// -// bcount.Wait(); // wait for all work to be complete -// -class BlockingCounter { - public: - explicit BlockingCounter(int initial_count) - : count_(initial_count), num_waiting_(0) {} - - BlockingCounter(const BlockingCounter&) = delete; - BlockingCounter& operator=(const BlockingCounter&) = delete; - - // BlockingCounter::DecrementCount() - // - // Decrements the counter's "count" by one, and return "count == 0". This - // function requires that "count != 0" when it is called. - // - // Memory ordering: For any threads X and Y, any action taken by X - // before it calls `DecrementCount()` is visible to thread Y after - // Y's call to `DecrementCount()`, provided Y's call returns `true`. - bool DecrementCount(); - - // BlockingCounter::Wait() - // - // Blocks until the counter reaches zero. This function may be called at most - // once. On return, `DecrementCount()` will have been called "initial_count" - // times and the blocking counter may be destroyed. - // - // Memory ordering: For any threads X and Y, any action taken by X - // before X calls `DecrementCount()` is visible to Y after Y returns - // from `Wait()`. - void Wait(); - - private: - Mutex lock_; - int count_ ABSL_GUARDED_BY(lock_); - int num_waiting_ ABSL_GUARDED_BY(lock_); -}; - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_ -- cgit 1.4.1