来自不同进程的文件的原子操作

Question

我需要处理来自不同进程的单个文件(读和写)。由于进程之间存在竞争，因此有必要阻止文件。目前正在按以下方式进行记录：

const int MAX_RETRY = 50;
const int DELAY_MS = 200;
bool Success = false;
int Retry = 0;
while (!Success && Retry < MAX_RETRY)
{
    try
    {
        using (StreamWriter Wr = new StreamWriter(ConfPath))
        {
            Wr.WriteLine("My content");
        }
    }
    catch (IOException)
    {
        Thread.Sleep(DELAY_MS);
        Retry++;
    }
}

我的问题有适当的解决办法吗？

Answer 1

您可以使用名为Mutex在进程之间共享锁：

const int MAX_RETRY = 50;
const int DELAY_MS = 200;
bool Success = false;
int Retry = 0;

// Will return an existing mutex if one with the same name already exists
Mutex mutex = new Mutex(false, "MutexName"); 
mutex.WaitOne();

try
{
    while (!Success && Retry < MAX_RETRY)
    {
        using (StreamWriter Wr = new StreamWriter(ConfPath))
        {
            Wr.WriteLine("My content");
        }
        Success = true;
    }
}
catch (IOException)
{
  Thread.Sleep(DELAY_MS);
  Retry++;
}
finally
{
    mutex.ReleaseMutex();
}