1 /**
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <ImsMediaCondition.h>
18 #include <errno.h>
19 #include <sys/time.h>
20
ImsMediaCondition()21 ImsMediaCondition::ImsMediaCondition()
22 {
23 reset();
24 mMutex = new pthread_mutex_t;
25 mCondition = new pthread_cond_t;
26
27 if (mMutex != nullptr)
28 {
29 pthread_mutex_init(mMutex, nullptr);
30 }
31
32 if (mCondition != nullptr)
33 {
34 pthread_cond_init(mCondition, nullptr);
35 }
36 }
37
~ImsMediaCondition()38 ImsMediaCondition::~ImsMediaCondition()
39 {
40 if (mCondition != nullptr)
41 {
42 pthread_cond_destroy(mCondition);
43 }
44
45 if (mMutex != nullptr)
46 {
47 pthread_mutex_destroy(mMutex);
48 }
49
50 if (mCondition != nullptr)
51 {
52 delete mCondition;
53 mCondition = nullptr;
54 }
55
56 if (mMutex != nullptr)
57 {
58 delete mMutex;
59 mMutex = nullptr;
60 }
61 }
62
wait()63 void ImsMediaCondition::wait()
64 {
65 while (pthread_mutex_lock(mMutex) == EINTR)
66 ;
67 if (mSignalFlag & (1 << mWaitCount))
68 { // signal() had been reached before wait()
69 mSignalFlag = mSignalFlag ^ (1 << mWaitCount);
70 }
71 else
72 {
73 mWaitFlag = mWaitFlag | (1 << mWaitCount);
74 while (pthread_cond_wait(mCondition, mMutex) == EINTR)
75 ;
76 }
77
78 IncCount(&mWaitCount);
79 pthread_mutex_unlock(mMutex);
80 }
81
wait_timeout(int64_t nRelativeTime)82 bool ImsMediaCondition::wait_timeout(int64_t nRelativeTime)
83 {
84 // make abs time
85 struct timespec ts;
86 struct timeval tv;
87 gettimeofday(&tv, (struct timezone*)nullptr);
88 uint64_t nInitTime = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
89 ts.tv_sec = tv.tv_sec + (nRelativeTime / 1000);
90 long addedUSec = tv.tv_usec + (nRelativeTime % 1000) * 1000L;
91
92 if (addedUSec >= 1000000)
93 {
94 ts.tv_sec++;
95 addedUSec -= 1000000;
96 }
97
98 ts.tv_nsec = addedUSec * 1000L;
99 // wait
100 while (pthread_mutex_lock(mMutex) == EINTR)
101 ;
102 if (mSignalFlag & (1 << mWaitCount))
103 { // signal() had been reached before wait()
104 mSignalFlag = mSignalFlag ^ (1 << mWaitCount);
105 }
106 else
107 {
108 mWaitFlag = mWaitFlag | (1 << mWaitCount);
109 while (pthread_cond_timedwait(mCondition, mMutex, &ts) == EINTR)
110 ;
111 }
112
113 IncCount(&mWaitCount);
114 pthread_mutex_unlock(mMutex);
115 struct timeval tl;
116 gettimeofday(&tl, (struct timezone*)nullptr);
117 uint64_t nCurrTime = (tl.tv_sec * 1000) + (tl.tv_usec / 1000);
118
119 if (nCurrTime - nInitTime >= nRelativeTime)
120 {
121 return true; // timeout
122 }
123 else
124 {
125 return false; // signal
126 }
127 }
128
signal()129 void ImsMediaCondition::signal()
130 {
131 if (mCondition == nullptr || mMutex == nullptr)
132 {
133 return;
134 }
135
136 while (pthread_mutex_lock(mMutex) == EINTR)
137 ;
138
139 if (mWaitFlag & (1 << mSignalCount))
140 {
141 mWaitFlag = mWaitFlag ^ (1 << mSignalCount);
142 }
143 else
144 {
145 mSignalFlag = mSignalFlag | (1 << mSignalCount);
146 }
147
148 pthread_cond_signal(mCondition);
149 IncCount(&mSignalCount);
150 pthread_mutex_unlock(mMutex);
151 }
152
reset()153 void ImsMediaCondition::reset()
154 {
155 mWaitFlag = 0;
156 mSignalFlag = 0;
157 mWaitCount = 0;
158 mSignalCount = 0;
159 }
160
IncCount(uint32_t * pnCount)161 void ImsMediaCondition::IncCount(uint32_t* pnCount)
162 {
163 uint32_t count = *pnCount;
164 count++;
165 if (count == 32)
166 count = 0;
167 *pnCount = count;
168 }
169