thread.hpp

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/*
    Copyright 2021 XITRIX
 
    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 <unistd.h>
 
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <cstdint>
#include <functional>
#include <mutex>
#include <set>
#include <thread>
#include <vector>
 
namespace aurore
{
 
struct DelayOperation
{
#ifdef PS4
    uint64_t startPoint;
#else
    // getCPUTimeUsec(): the test harness' simulated clock when it runs
    int64_t startPoint;
#endif
    long delayMilliseconds;
    size_t index;
    std::function<void()> func;
};
 
typedef std::vector<DelayOperation>::iterator DelayOperationIterator;
 
extern void sync(std::function<void()> func);
 
extern void async(std::function<void()> func);
 
extern size_t delay(long milliseconds, std::function<void()> func);
 
extern void cancelDelay(size_t iter);
 
// The free functions above are the API for apps; Threading is what the
// application runs them with (start, stop, performSyncTasks each frame)
class Threading
{
  public:
    static void sync(std::function<void()> func);
 
    static void async(std::function<void()> func);
 
    static void asyncDecode(std::function<void()> func);
 
    static size_t delay(long milliseconds, std::function<void()> func);
 
    static void cancelDelay(size_t iter);
 
    static void start();
 
    static void stop();
 
    static void performSyncTasks();
 
    static void setSyncTaskBudget(uint64_t microseconds);
 
    static bool isIdle();
 
  private:
    inline static std::mutex m_sync_mutex;
    inline static std::vector<std::function<void()>> m_sync_functions;
    inline static uint64_t m_sync_budget = 0;
 
    inline static std::mutex m_async_mutex;
    inline static std::vector<std::function<void()>> m_async_tasks;
    inline static std::condition_variable m_async_cv;
    inline static int m_async_running = 0; // under m_async_mutex
 
    inline static std::mutex m_delay_mutex;
    inline static std::vector<DelayOperation> m_delay_tasks;
    inline static std::set<size_t> m_delay_cancel_set;
    inline static std::set<size_t> m_delay_pending; // queued, not run nor cancelled
    inline static size_t m_delay_index = 0;
 
    inline static std::atomic<bool> task_loop_active { true };
    inline static bool task_loop_running = false; // started and not stopped
 
    static void* task_loop(void* a);
    static void std_task_loop();
    static void* decode_loop(void* a);
 
    static void start_task_loop();
};
 
} // namespace aurore