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
|
/*
* Copyright 2022 The Android Open Source Project
*
* 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
*
* http://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.
*/
#pragma once
#include <log/log.h>
#include <utils/Mutex.h>
namespace android {
struct SCOPED_CAPABILITY ConditionalLock {
ConditionalLock(Mutex& mutex, bool lock) ACQUIRE(mutex) : mutex(mutex), lock(lock) {
if (lock) mutex.lock();
}
~ConditionalLock() RELEASE() {
if (lock) mutex.unlock();
}
Mutex& mutex;
const bool lock;
};
struct SCOPED_CAPABILITY TimedLock {
TimedLock(Mutex& mutex, nsecs_t timeout, const char* whence) ACQUIRE(mutex)
: mutex(mutex), status(mutex.timedLock(timeout)) {
ALOGE_IF(!locked(), "%s timed out locking: %s (%d)", whence, strerror(-status), status);
}
~TimedLock() RELEASE() {
if (locked()) mutex.unlock();
}
bool locked() const { return status == NO_ERROR; }
Mutex& mutex;
const status_t status;
};
// Require, under penalty of compilation failure, that the compiler thinks that a mutex is held.
#define REQUIRE_MUTEX(expr) ([]() REQUIRES(expr) {})()
// Tell the compiler that we know that a mutex is held.
#define ASSERT_MUTEX(expr) ([]() ASSERT_CAPABILITY(expr) {})()
// Specify that one mutex is an alias for another.
// (e.g. SurfaceFlinger::mStateLock and Layer::mFlinger->mStateLock)
#define MUTEX_ALIAS(held, alias) (REQUIRE_MUTEX(held), ASSERT_MUTEX(alias))
} // namespace android
|
