47 lines
1.4 KiB
PHP
47 lines
1.4 KiB
PHP
|
// 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"
|