1 /*
2 * Copyright (C) 2019 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 "CommonPool.h"
18
19 #include <sys/resource.h>
20 #include <utils/Trace.h>
21 #include "renderthread/RenderThread.h"
22
23 #include <array>
24
25 namespace android {
26 namespace uirenderer {
27
CommonPool()28 CommonPool::CommonPool() {
29 ATRACE_CALL();
30
31 CommonPool* pool = this;
32 // Create 2 workers
33 for (int i = 0; i < THREAD_COUNT; i++) {
34 std::thread worker([pool, i] {
35 {
36 std::array<char, 20> name{"hwuiTask"};
37 snprintf(name.data(), name.size(), "hwuiTask%d", i);
38 auto self = pthread_self();
39 pthread_setname_np(self, name.data());
40 setpriority(PRIO_PROCESS, 0, PRIORITY_FOREGROUND);
41 auto startHook = renderthread::RenderThread::getOnStartHook();
42 if (startHook) {
43 startHook(name.data());
44 }
45 }
46 pool->workerLoop();
47 });
48 worker.detach();
49 }
50 }
51
instance()52 CommonPool& CommonPool::instance() {
53 static CommonPool pool;
54 return pool;
55 }
56
post(Task && task)57 void CommonPool::post(Task&& task) {
58 instance().enqueue(std::move(task));
59 }
60
enqueue(Task && task)61 void CommonPool::enqueue(Task&& task) {
62 std::unique_lock lock(mLock);
63 while (!mWorkQueue.hasSpace()) {
64 lock.unlock();
65 usleep(100);
66 lock.lock();
67 }
68 mWorkQueue.push(std::move(task));
69 if (mWaitingThreads == THREAD_COUNT || (mWaitingThreads > 0 && mWorkQueue.size() > 1)) {
70 mCondition.notify_one();
71 }
72 }
73
workerLoop()74 void CommonPool::workerLoop() {
75 std::unique_lock lock(mLock);
76 while (true) {
77 if (!mWorkQueue.hasWork()) {
78 mWaitingThreads++;
79 mCondition.wait(lock);
80 mWaitingThreads--;
81 }
82 // Need to double-check that work is still available now that we have the lock
83 // It may have already been grabbed by a different thread
84 while (mWorkQueue.hasWork()) {
85 auto work = mWorkQueue.pop();
86 lock.unlock();
87 work();
88 lock.lock();
89 }
90 }
91 }
92
waitForIdle()93 void CommonPool::waitForIdle() {
94 instance().doWaitForIdle();
95 }
96
doWaitForIdle()97 void CommonPool::doWaitForIdle() {
98 std::unique_lock lock(mLock);
99 while (mWaitingThreads != THREAD_COUNT) {
100 lock.unlock();
101 usleep(100);
102 lock.lock();
103 }
104 }
105
106 } // namespace uirenderer
107 } // namespace android