public void ExclusiveFileAccess()
{
// create the test file
using (StreamWriter writer = new StreamWriter(File.OpenWrite("test.test"))) {
writer.Write("Hello World!");
writer.Close();
}
// kick off the thread to do the second open
ManualResetEvent first = new ManualResetEvent(false);
ManualResetEvent second = new ManualResetEvent(false);
ManualResetEvent third = new ManualResetEvent(false);
ManualResetEvent fourth = new ManualResetEvent(false);
Async.Fork(delegate() {
first.WaitOne();
try {
using (Stream f = StreamUtil.FileOpenExclusive("test.test")) {
Assert.IsNull(f, "file open succeeded when it was expected to fail");
}
} catch {
third.Set();
fourth.Set();
throw;
}
second.WaitOne();
third.Set();
try {
using (Stream f = StreamUtil.FileOpenExclusive("test.test")) {
Assert.IsNotNull(f, "file open failed when it was expected to succeed");
}
} catch {
fourth.Set();
throw;
}
fourth.Set();
}, null);
// open the file first
using (Stream g = StreamUtil.FileOpenExclusive("test.test")) {
first.Set();
Thread.Sleep(2000);
second.Set();
Thread.Sleep(500);
third.WaitOne();
g.Close();
}
fourth.WaitOne();
File.Delete("test.test");
}
