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/internal/waiter.h | 155 --------------------- 1 file changed, 155 deletions(-) delete mode 100644 third_party/abseil_cpp/absl/synchronization/internal/waiter.h (limited to 'third_party/abseil_cpp/absl/synchronization/internal/waiter.h') diff --git a/third_party/abseil_cpp/absl/synchronization/internal/waiter.h b/third_party/abseil_cpp/absl/synchronization/internal/waiter.h deleted file mode 100644 index be3df180d4e2..000000000000 --- a/third_party/abseil_cpp/absl/synchronization/internal/waiter.h +++ /dev/null @@ -1,155 +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. -// - -#ifndef ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_ -#define ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_ - -#include "absl/base/config.h" - -#ifdef _WIN32 -#include -#else -#include -#endif - -#ifdef __linux__ -#include -#endif - -#ifdef ABSL_HAVE_SEMAPHORE_H -#include -#endif - -#include -#include - -#include "absl/base/internal/thread_identity.h" -#include "absl/synchronization/internal/futex.h" -#include "absl/synchronization/internal/kernel_timeout.h" - -// May be chosen at compile time via -DABSL_FORCE_WAITER_MODE= -#define ABSL_WAITER_MODE_FUTEX 0 -#define ABSL_WAITER_MODE_SEM 1 -#define ABSL_WAITER_MODE_CONDVAR 2 -#define ABSL_WAITER_MODE_WIN32 3 - -#if defined(ABSL_FORCE_WAITER_MODE) -#define ABSL_WAITER_MODE ABSL_FORCE_WAITER_MODE -#elif defined(_WIN32) && _WIN32_WINNT >= _WIN32_WINNT_VISTA -#define ABSL_WAITER_MODE ABSL_WAITER_MODE_WIN32 -#elif defined(ABSL_INTERNAL_HAVE_FUTEX) -#define ABSL_WAITER_MODE ABSL_WAITER_MODE_FUTEX -#elif defined(ABSL_HAVE_SEMAPHORE_H) -#define ABSL_WAITER_MODE ABSL_WAITER_MODE_SEM -#else -#define ABSL_WAITER_MODE ABSL_WAITER_MODE_CONDVAR -#endif - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace synchronization_internal { - -// Waiter is an OS-specific semaphore. -class Waiter { - public: - // Prepare any data to track waits. - Waiter(); - - // Not copyable or movable - Waiter(const Waiter&) = delete; - Waiter& operator=(const Waiter&) = delete; - - // Destroy any data to track waits. - ~Waiter(); - - // Blocks the calling thread until a matching call to `Post()` or - // `t` has passed. Returns `true` if woken (`Post()` called), - // `false` on timeout. - bool Wait(KernelTimeout t); - - // Restart the caller of `Wait()` as with a normal semaphore. - void Post(); - - // If anyone is waiting, wake them up temporarily and cause them to - // call `MaybeBecomeIdle()`. They will then return to waiting for a - // `Post()` or timeout. - void Poke(); - - // Returns the Waiter associated with the identity. - static Waiter* GetWaiter(base_internal::ThreadIdentity* identity) { - static_assert( - sizeof(Waiter) <= sizeof(base_internal::ThreadIdentity::WaiterState), - "Insufficient space for Waiter"); - return reinterpret_cast(identity->waiter_state.data); - } - - // How many periods to remain idle before releasing resources -#ifndef ABSL_HAVE_THREAD_SANITIZER - static constexpr int kIdlePeriods = 60; -#else - // Memory consumption under ThreadSanitizer is a serious concern, - // so we release resources sooner. The value of 1 leads to 1 to 2 second - // delay before marking a thread as idle. - static const int kIdlePeriods = 1; -#endif - - private: -#if ABSL_WAITER_MODE == ABSL_WAITER_MODE_FUTEX - // Futexes are defined by specification to be 32-bits. - // Thus std::atomic must be just an int32_t with lockfree methods. - std::atomic futex_; - static_assert(sizeof(int32_t) == sizeof(futex_), "Wrong size for futex"); - -#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_CONDVAR - // REQUIRES: mu_ must be held. - void InternalCondVarPoke(); - - pthread_mutex_t mu_; - pthread_cond_t cv_; - int waiter_count_; - int wakeup_count_; // Unclaimed wakeups. - -#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_SEM - sem_t sem_; - // This seems superfluous, but for Poke() we need to cause spurious - // wakeups on the semaphore. Hence we can't actually use the - // semaphore's count. - std::atomic wakeups_; - -#elif ABSL_WAITER_MODE == ABSL_WAITER_MODE_WIN32 - // WinHelper - Used to define utilities for accessing the lock and - // condition variable storage once the types are complete. - class WinHelper; - - // REQUIRES: WinHelper::GetLock(this) must be held. - void InternalCondVarPoke(); - - // We can't include Windows.h in our headers, so we use aligned charachter - // buffers to define the storage of SRWLOCK and CONDITION_VARIABLE. - alignas(void*) unsigned char mu_storage_[sizeof(void*)]; - alignas(void*) unsigned char cv_storage_[sizeof(void*)]; - int waiter_count_; - int wakeup_count_; - -#else - #error Unknown ABSL_WAITER_MODE -#endif -}; - -} // namespace synchronization_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_SYNCHRONIZATION_INTERNAL_WAITER_H_ -- cgit 1.4.1