FileSemaphore class allow us to pause program execution and wait for a file appear in a given folder with a given name and eventually with a given content.
You can also handle the “unlock” event that contains the filename and the content of the file that has caused the event.
Full class documentation is here!
string semFile = Path.Combine (Directory.GetCurrentDirectory (), "semaphore4.sem");
string content = "specific content";
// Deleting file if exists
if (File.Exists (semFile)) File.Delete (semFile);
FileSemaphore fs = new FileSemaphore (semFile, content);
bool ok = fs.WaitForUnlock (10000, out FileSemaphoreEventArgs eventArgs);
// Here you can write the file manually to unlock the program...
if (ok){
Console.WriteLine("Unlocked by file");
} else {
Console.WriteLine("Timeout!");
}FileSemaphore fs = new FileSemaphore ("semaphore.sem");
fs.UnLocked += (s, e) => {
Console.WriteLine ($"t1: semaphore is unlocked with {e.Filename} with '{e.Content}' as content.");
};
fs.Start ();
Thread.Sleep(1000);
File.WriteAllText ("semaphore.sem", "hello semaphore!");
Thread.Sleep(1000);