Remove old TaskManager system
Replace it with a newer, fancier, WorkQueue-inspired
one that's just a global common thread pool.
Test: hwuiunit passes
Change-Id: Ib5d03104a08bbac9a4ec67a1bfc0db2b35d6700f
diff --git a/libs/hwui/thread/CommonPool.h b/libs/hwui/thread/CommonPool.h
new file mode 100644
index 0000000..aef2990
--- /dev/null
+++ b/libs/hwui/thread/CommonPool.h
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#ifndef FRAMEWORKS_BASE_COMMONPOOL_H
+#define FRAMEWORKS_BASE_COMMONPOOL_H
+
+#include "utils/Macros.h"
+
+#include <log/log.h>
+
+#include <condition_variable>
+#include <functional>
+#include <future>
+#include <mutex>
+
+namespace android {
+namespace uirenderer {
+
+template <class T, int SIZE>
+class ArrayQueue {
+ PREVENT_COPY_AND_ASSIGN(ArrayQueue);
+ static_assert(SIZE > 0, "Size must be positive");
+
+public:
+ ArrayQueue() = default;
+ ~ArrayQueue() = default;
+
+ constexpr size_t capacity() const { return SIZE; }
+ constexpr bool hasWork() const { return mHead != mTail; }
+ constexpr bool hasSpace() const { return ((mHead + 1) % SIZE) != mTail; }
+ constexpr int size() const {
+ if (mHead > mTail) {
+ return mHead - mTail;
+ } else {
+ return mTail - mHead + SIZE;
+ }
+ }
+
+ constexpr void push(T&& t) {
+ int newHead = (mHead + 1) % SIZE;
+ LOG_ALWAYS_FATAL_IF(newHead == mTail, "no space");
+
+ mBuffer[mHead] = std::move(t);
+ mHead = newHead;
+ }
+
+ constexpr T&& pop() {
+ LOG_ALWAYS_FATAL_IF(mTail == mHead, "empty");
+ int index = mTail;
+ mTail = (mTail + 1) % SIZE;
+ return std::move(mBuffer[index]);
+ }
+
+private:
+ T mBuffer[SIZE];
+ int mHead = 0;
+ int mTail = 0;
+};
+
+class CommonPool {
+ PREVENT_COPY_AND_ASSIGN(CommonPool);
+
+public:
+ using Task = std::function<void()>;
+ static constexpr auto THREAD_COUNT = 2;
+ static constexpr auto QUEUE_SIZE = 128;
+
+ static void post(Task&& func);
+
+ template <class F>
+ static auto async(F&& func) -> std::future<decltype(func())> {
+ typedef std::packaged_task<decltype(func())()> task_t;
+ auto task = std::make_shared<task_t>(std::forward<F>(func));
+ post([task]() { std::invoke(*task); });
+ return task->get_future();
+ }
+
+ template <class F>
+ static auto runSync(F&& func) -> decltype(func()) {
+ std::packaged_task<decltype(func())()> task{std::forward<F>(func)};
+ post([&task]() { std::invoke(task); });
+ return task.get_future().get();
+ };
+
+private:
+ CommonPool();
+ ~CommonPool() {}
+
+ void enqueue(Task&&);
+
+ void workerLoop();
+
+ std::mutex mLock;
+ std::condition_variable mCondition;
+ int mWaitingThreads = 0;
+ ArrayQueue<Task, QUEUE_SIZE> mWorkQueue;
+};
+
+} // namespace uirenderer
+} // namespace android
+
+#endif // FRAMEWORKS_BASE_COMMONPOOL_H