Unity 编辑器下多线程处理文件

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/akof1314/article/details/82889968

原因

在unity编辑器下打算用多线程来查找处理里面的资源，但又想阻塞主线程，防止用户操作unity，又能准确显示多线程的进度。在分析unity编辑器的使用多线程示例后，发现可以用 ManualResetEvent 信号来通知主线程。

解决

主线程阻塞掉，直到信号通知继续执行下面的操作。另外，保证多线程的数量跟处理器数量一致，最大化使用多线程。

#region  多线程执行

private class JobFileTextSearchReplace
{
    private string m_Path;
    private List<string> m_Patterns;
    private string m_ReplaceStr;
    private bool[] m_SearchRet;

    public ManualResetEvent doneEvent;
    public string exception;

    public JobFileTextSearchReplace(string path, List<string> patterns, string replaceStr, bool[] searchRet)
    {
        m_Path = path;
        m_Patterns = patterns;
        m_ReplaceStr = replaceStr;
        m_SearchRet = searchRet;
        doneEvent = new ManualResetEvent(false);
    }

    public void ThreadPoolCallback(System.Object threadContext)
    {
        try
        {
            string text = File.ReadAllText(m_Path);

            ///
        }
        catch (Exception ex)
        {
            exception = m_Path + "\n" + ex.Message;
        }

        doneEvent.Set();
    }
}

protected void ThreadDoFilesTextSearchReplace(List<string> fileList, List<string> patterns, string replaceStr, bool[][] searchRetList)
{
    List<JobFileTextSearchReplace> jobList = new List<JobFileTextSearchReplace>();
    List<ManualResetEvent> eventList = new List<ManualResetEvent>();

    int numFiles = fileList.Count;
    int numFinished = 0;
    AssetDanshariUtility.DisplayThreadProgressBar(numFiles, numFinished);

    int timeout = 600000;  // 10 分钟超时

    for (var i = 0; i < fileList.Count; i++)
    {
        JobFileTextSearchReplace job = new JobFileTextSearchReplace(fileList[i], patterns, replaceStr, searchRetList[i]);
        jobList.Add(job);
        eventList.Add(job.doneEvent);
        ThreadPool.QueueUserWorkItem(job.ThreadPoolCallback);

        if (eventList.Count >= Environment.ProcessorCount)
        {
            WaitForDoFile(eventList, timeout);
            AssetDanshariUtility.DisplayThreadProgressBar(numFiles, numFinished);
            numFinished++;
        }
    }

    while (eventList.Count > 0)
    {
        WaitForDoFile(eventList, timeout);
        AssetDanshariUtility.DisplayThreadProgressBar(numFiles, numFinished);
        numFinished++;
    }

    foreach (var job in jobList)
    {
        if (!string.IsNullOrEmpty(job.exception))
        {
            Debug.LogError(job.exception);
        }
    }
}

private void WaitForDoFile(List<ManualResetEvent> events, int timeout)
{
    int finished = WaitHandle.WaitAny(events.ToArray(), timeout);
    if (finished == WaitHandle.WaitTimeout)
    {
        // 超时
    }
    events.RemoveAt(finished);
}

#endregion