1 /*
2  * Copyright (c) 2021-2021 Huawei Device Co., Ltd.
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  *     http://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 
16 #ifndef HISTREAMER_FOUNDATION_OSAL_CONDITION_VARIABLE_H
17 #define HISTREAMER_FOUNDATION_OSAL_CONDITION_VARIABLE_H
18 
19 #include <cerrno>
20 #include <ctime>
21 #include "foundation/osal/thread/scoped_lock.h"
22 
23 namespace OHOS {
24 namespace Media {
25 namespace OSAL {
26 class ConditionVariable {
27 public:
28     ConditionVariable() noexcept;
29 
30     virtual ~ConditionVariable() noexcept;
31 
32     ConditionVariable(const ConditionVariable& other) = delete;
33 
34     ConditionVariable operator=(const ConditionVariable& other) = delete;
35 
36     void NotifyOne() noexcept;
37 
38     void NotifyAll() noexcept;
39 
40     void Wait(ScopedLock& lock) noexcept;
41 
42     template <typename Predicate>
Wait(ScopedLock & lock,Predicate pred)43     void Wait(ScopedLock& lock, Predicate pred) noexcept
44     {
45         while (!pred()) {
46             Wait(lock);
47         }
48     }
49 
50     bool WaitFor(ScopedLock& lock, int timeoutMs);
51 
52     template <typename Predicate>
WaitFor(ScopedLock & lock,int timeoutMs,Predicate pred)53     bool WaitFor(ScopedLock& lock, int timeoutMs, Predicate pred)
54     {
55         if (timeoutMs < 0) {
56             return false;
57         }
58         struct timespec timeout = {0, 0};
59 #ifdef USING_CLOCK_REALTIME
60         clock_gettime(CLOCK_REALTIME, &timeout);
61 #else
62         clock_gettime(CLOCK_MONOTONIC, &timeout);
63 #endif
64         timeout.tv_sec += timeoutMs / 1000;              // 1000
65         timeout.tv_nsec += (timeoutMs % 1000) * 1000000; // 1000 1000000
66         int status = 0;
67         while (!pred() && (status == 0)) {
68             status = pthread_cond_timedwait(&cond_, &(lock.mutex_->nativeHandle_),
69                                             &timeout);
70             if (status == ETIMEDOUT) {
71                 return pred();
72             }
73         }
74         return status == 0;
75     }
76 
77 private:
78     bool condInited_;
79     pthread_cond_t cond_{};
80 };
81 } // namespace OSAL
82 } // namespace Media
83 } // namespace OHOS
84 
85 #endif // HISTREAMER_FOUNDATION_OSAL_CONDITION_VARIABLE_H
86