| // 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 Posix-specific part of spinlock_wait.cc |
| |
| #include <sched.h> |
| |
| #include <atomic> |
| #include <ctime> |
| |
| #include "absl/base/internal/errno_saver.h" |
| #include "absl/base/internal/scheduling_mode.h" |
| #include "absl/base/port.h" |
| |
| extern "C" { |
| |
| ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)( |
| std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop, |
| absl::base_internal::SchedulingMode /* mode */) { |
| absl::base_internal::ErrnoSaver errno_saver; |
| if (loop == 0) { |
| } else if (loop == 1) { |
| sched_yield(); |
| } else { |
| struct timespec tm; |
| tm.tv_sec = 0; |
| tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop); |
| nanosleep(&tm, nullptr); |
| } |
| } |
| |
| ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)( |
| std::atomic<uint32_t>* /* lock_word */, bool /* all */) {} |
| |
| } // extern "C" |
