diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/synchronization/internal/per_thread_sem.cc')
-rw-r--r-- | third_party/abseil_cpp/absl/synchronization/internal/per_thread_sem.cc | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/third_party/abseil_cpp/absl/synchronization/internal/per_thread_sem.cc b/third_party/abseil_cpp/absl/synchronization/internal/per_thread_sem.cc deleted file mode 100644 index 821ca9b4e9c3..000000000000 --- a/third_party/abseil_cpp/absl/synchronization/internal/per_thread_sem.cc +++ /dev/null @@ -1,106 +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. - -// This file is a no-op if the required LowLevelAlloc support is missing. -#include "absl/base/internal/low_level_alloc.h" -#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING - -#include "absl/synchronization/internal/per_thread_sem.h" - -#include <atomic> - -#include "absl/base/attributes.h" -#include "absl/base/internal/thread_identity.h" -#include "absl/synchronization/internal/waiter.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace synchronization_internal { - -void PerThreadSem::SetThreadBlockedCounter(std::atomic<int> *counter) { - base_internal::ThreadIdentity *identity; - identity = GetOrCreateCurrentThreadIdentity(); - identity->blocked_count_ptr = counter; -} - -std::atomic<int> *PerThreadSem::GetThreadBlockedCounter() { - base_internal::ThreadIdentity *identity; - identity = GetOrCreateCurrentThreadIdentity(); - return identity->blocked_count_ptr; -} - -void PerThreadSem::Init(base_internal::ThreadIdentity *identity) { - new (Waiter::GetWaiter(identity)) Waiter(); - identity->ticker.store(0, std::memory_order_relaxed); - identity->wait_start.store(0, std::memory_order_relaxed); - identity->is_idle.store(false, std::memory_order_relaxed); -} - -void PerThreadSem::Destroy(base_internal::ThreadIdentity *identity) { - Waiter::GetWaiter(identity)->~Waiter(); -} - -void PerThreadSem::Tick(base_internal::ThreadIdentity *identity) { - const int ticker = - identity->ticker.fetch_add(1, std::memory_order_relaxed) + 1; - const int wait_start = identity->wait_start.load(std::memory_order_relaxed); - const bool is_idle = identity->is_idle.load(std::memory_order_relaxed); - if (wait_start && (ticker - wait_start > Waiter::kIdlePeriods) && !is_idle) { - // Wakeup the waiting thread since it is time for it to become idle. - Waiter::GetWaiter(identity)->Poke(); - } -} - -} // namespace synchronization_internal -ABSL_NAMESPACE_END -} // namespace absl - -extern "C" { - -ABSL_ATTRIBUTE_WEAK void AbslInternalPerThreadSemPost( - absl::base_internal::ThreadIdentity *identity) { - absl::synchronization_internal::Waiter::GetWaiter(identity)->Post(); -} - -ABSL_ATTRIBUTE_WEAK bool AbslInternalPerThreadSemWait( - absl::synchronization_internal::KernelTimeout t) { - bool timeout = false; - absl::base_internal::ThreadIdentity *identity; - identity = absl::synchronization_internal::GetOrCreateCurrentThreadIdentity(); - - // Ensure wait_start != 0. - int ticker = identity->ticker.load(std::memory_order_relaxed); - identity->wait_start.store(ticker ? ticker : 1, std::memory_order_relaxed); - identity->is_idle.store(false, std::memory_order_relaxed); - - if (identity->blocked_count_ptr != nullptr) { - // Increment count of threads blocked in a given thread pool. - identity->blocked_count_ptr->fetch_add(1, std::memory_order_relaxed); - } - - timeout = - !absl::synchronization_internal::Waiter::GetWaiter(identity)->Wait(t); - - if (identity->blocked_count_ptr != nullptr) { - identity->blocked_count_ptr->fetch_sub(1, std::memory_order_relaxed); - } - - identity->is_idle.store(false, std::memory_order_relaxed); - identity->wait_start.store(0, std::memory_order_relaxed); - return !timeout; -} - -} // extern "C" - -#endif // ABSL_LOW_LEVEL_ALLOC_MISSING |