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1// Copyright 2017 The Abseil Authors.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//      https://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14//
15// This file is an Akaros-specific part of spinlock_wait.cc
16
17#include <atomic>
18
19#include "absl/base/internal/scheduling_mode.h"
20
21extern "C" {
22
23ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
24    std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */,
25    int /* loop */, absl::base_internal::SchedulingMode /* mode */) {
26  // In Akaros, one must take care not to call anything that could cause a
27  // malloc(), a blocking system call, or a uthread_yield() while holding a
28  // spinlock. Our callers assume will not call into libraries or other
29  // arbitrary code.
30}
31
32ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(
33    std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
34
35}  // extern "C"
36