chromium/third_party/abseil-cpp/absl/synchronization/internal/sem_waiter.cc

// Copyright 2023 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.

#include "absl/synchronization/internal/sem_waiter.h"

#ifdef ABSL_INTERNAL_HAVE_SEM_WAITER

#include <semaphore.h>

#include <atomic>
#include <cassert>
#include <cstdint>
#include <cerrno>

#include "absl/base/config.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/thread_identity.h"
#include "absl/base/optimization.h"
#include "absl/synchronization/internal/kernel_timeout.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace synchronization_internal {

#ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL
constexpr char SemWaiter::kName[];
#endif

SemWaiter::SemWaiter() : … { … }

#if defined(__GLIBC__) && \
    (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 30))
#define ABSL_INTERNAL_HAVE_SEM_CLOCKWAIT …
#elif defined(__ANDROID_API__) && __ANDROID_API__ >= 30
#define ABSL_INTERNAL_HAVE_SEM_CLOCKWAIT …
#endif

// Calls sem_timedwait() or possibly something else like
// sem_clockwait() depending on the platform and
// KernelTimeout requested. The return value is the same as a call to the return
// value to a call to sem_timedwait().
int SemWaiter::TimedWait(KernelTimeout t) { … }

bool SemWaiter::Wait(KernelTimeout t) { … }

void SemWaiter::Post() { … }

void SemWaiter::Poke() { … }

}  // namespace synchronization_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_INTERNAL_HAVE_SEM_WAITER