blob: f1d12140f0ec14b3f4d819c435c5c165618e5007 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// 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.
//
#ifndef Y_ABSL_SYNCHRONIZATION_INTERNAL_SEM_WAITER_H_
#define Y_ABSL_SYNCHRONIZATION_INTERNAL_SEM_WAITER_H_
#include "y_absl/base/config.h"
#ifdef Y_ABSL_HAVE_SEMAPHORE_H
#include <semaphore.h>
#include <atomic>
#include <cstdint>
#include "y_absl/base/internal/thread_identity.h"
#include "y_absl/synchronization/internal/futex.h"
#include "y_absl/synchronization/internal/kernel_timeout.h"
#include "y_absl/synchronization/internal/waiter_base.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
namespace synchronization_internal {
#define Y_ABSL_INTERNAL_HAVE_SEM_WAITER 1
class SemWaiter : public WaiterCrtp<SemWaiter> {
public:
SemWaiter();
bool Wait(KernelTimeout t);
void Post();
void Poke();
static constexpr char kName[] = "SemWaiter";
private:
int TimedWait(KernelTimeout t);
sem_t sem_;
// This seems superfluous, but for Poke() we need to cause spurious
// wakeups on the semaphore. Hence we can't actually use the
// semaphore's count.
std::atomic<int> wakeups_;
};
} // namespace synchronization_internal
Y_ABSL_NAMESPACE_END
} // namespace y_absl
#endif // Y_ABSL_HAVE_SEMAPHORE_H
#endif // Y_ABSL_SYNCHRONIZATION_INTERNAL_SEM_WAITER_H_
|
