Bug 57069 - WaitHandle.SignalAndWait is broke
Summary: WaitHandle.SignalAndWait is broke
Status: RESOLVED FIXED
Alias: None
Product: Runtime
Classification: Mono
Component: io-layer (show other bugs)
Version: 5.0 (2017-02)
Hardware: PC Mac OS
: Normal major
Target Milestone: ---
Assignee: Ludovic Henry
URL:
Depends on:
Blocks:
 
Reported: 2017-06-01 19:20 UTC by Jonathan Chambers
Modified: 2017-06-05 19:18 UTC (History)
4 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.


Please create a new report on GitHub or Developer Community with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:
Status:
RESOLVED FIXED

Description Jonathan Chambers 2017-06-01 19:20:34 UTC
Run the follow test case. It hangs in Mono 5.0+. This is a regression from Mono 4.8

using System;
using System.Threading;

internal class Program
{
    public static void Main (string[] args)
    {
        using (var eventToSignal = new AutoResetEvent (false))
        using (var eventToWait = new AutoResetEvent (false))
        {
            eventToWait.Set ();

            var res1 = WaitHandle.SignalAndWait (eventToSignal, eventToWait);
            Console.WriteLine ("res1: " + res1);

            var res2 = eventToSignal.WaitOne ();
            Console.WriteLine ("res2: " + res2);
        }
    }
}
Comment 1 Jonathan Chambers 2017-06-01 19:28:04 UTC
This runs fine on Mono with Windows, so this looks like a w32 layer issue.
Comment 2 Ludovic Henry 2017-06-05 19:18:33 UTC
This is fixed with https://github.com/mono/mono/pull/4973