singleton - 在 dotnet 核心中，如何确保我的应用程序只有一个副本在运行？

Question

我以前做过这样的事情

private static bool AlreadyRunning()
{
    var processes = Process.GetProcesses();
    var currentProc = Process.GetCurrentProcess();
    logger.Info($"Current proccess: {currentProc.ProcessName}");
    foreach (var process in processes)
    {
        if (currentProc.ProcessName == process.ProcessName && currentProc.Id != process.Id)
        {
            logger.Info($"Another instance of this process is already running: {process.Id}");
            return true;
        }
    }
    return false;
}

效果很好。在新的 dotnet 核心世界中，所有东西都有一个名为 dotnet 的进程名称，所以我一次只能运行一个 dotnet 应用程序!不是我想要的 :D

在 dotnet 中是否有一种理想的方法来做到这一点？我看到建议的互斥体，但我不确定我是否理解在除 Windows 机器之外的其他系统上运行的可能缺点或错误状态。

Answer 1

.NET Core 现在支持全局命名互斥锁。来自 PR description ，添加了该功能:

• On systems that support thread process-shared robust recursive mutexes, they will be used
• On other systems, file locks are used. File locks, unfortunately, don't have a timeout in the blocking wait call, and I didn't find any other sync object with a timed wait with the necessary properties, so polling is done for timed waits.

此外，Named mutex not supported on Unix 中有一个有用的注释关于互斥锁名称的问题，应该使用:

By default, names have session scope and sessions are more granular on Unix (each terminal gets its own session). Try adding a "Global" prefix to the name minus the quotes.