Hi,
mono used to support this functionality, but the code to do that was very
problematic, and it is disabled in recent mono releases.
Zoltan
On Wed, Jul 2, 2014 at 9:31 PM, Edward Ned Harvey (mono) <
edward.harvey.m...@clevertrove.com> wrote:
> Before anything else ... Can anybody recommend a way to do interprocess
> mutex?
>
> I would like to confirm this is a bug before I go create a bug report in
> bugzilla. Can anybody please confirm both (a) you get the same behavior,
> and (b) it's not correct behavior?
>
> I want to make this observation as well: The class in question is
> System.Threading.Mutex. But on the mono class status pages, there seems to
> be no System.Threading.Mutex. So that sounds a little suspicious to me,
> but maybe it's ok? Or maybe I'm overlooking it somehow?
>
> Here is some sample source code:
> using System;
> using System.Threading;
>
> namespace FunWithMutex
> {
> class MainClass
> {
> static string mutexName;
> const int numThreads = 5;
> static Thread[] allThreads = new Thread[numThreads];
> public static void Main(string[] args)
> {
> mutexName = @"Global\mutex-test-erihjbnkjvwiuehrnkjcxvjhwehiu";
> for (int i=0; i<numThreads; i++)
> {
> allThreads[i] = new Thread(new ThreadStart(DoSomething));
> allThreads[i].Name = "Thread #" + i.ToString();
> allThreads[i].Start();
> }
> }
> static void DoSomething()
> {
> System.Console.Error.WriteLine(Thread.CurrentThread.Name + "
> starting...");
> using (var myMutex = new Mutex(false,mutexName))
> {
> myMutex.WaitOne();
> try
> {
> System.Console.Error.WriteLine(
> Thread.CurrentThread.Name + " running...");
> Thread.Sleep(TimeSpan.FromSeconds(5));
> System.Console.Error.WriteLine(
> Thread.CurrentThread.Name + " finished...");
> }
> finally
> {
> myMutex.ReleaseMutex();
> }
> }
> }
> }
> }
>
>
> When run in windows .NET, you launch several processes that each run the
> above code, and the Mutex will only allow one process to enter at a time.
>
> When run in Mono, a single process obeys the mutex correctly, but multiple
> processes that are launched concurrently, each have an apparently private
> mutex, because each process will allow a single thread to enter the mutex
> concurrently.
>
> In other words, the mutex *should* provide synchronization across multiple
> processes, but it doesn't. Instead, it only provides synchronization
> across multiple threads within a single process.
>
> _______________________________________________
> Mono-devel-list mailing list
> Mono-devel-list@lists.ximian.com
> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>
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