C#

<br />
<br />
public class SingleProgramInstance : IDisposable<br />
{<br />
       //private members <br />
        private Mutex __mutex;<br />
        private bool __firstInstance = false;<br />
        private string __uniqueName = String.Empty;<br />
       <br />
        private Mutex Mutex<br />
        {<br />
            get { return __mutex; }<br />
            private set { __mutex = value; }<br />
        }<br />
<br />
        public string UniqueName<br />
        {<br />
            get { return __uniqueName; }<br />
            private set { __uniqueName = value; }<br />
        }<br />
 <br />
        public SingleProgramInstance()<br />
            : this(String.Empty)<br />
        {      }<br />
        <br />
        public SingleProgramInstance(string identifier)<br />
        {<br />
            //Initialize a named mutex and attempt to<br />
            // get ownership immediately.<br />
            //Use an addtional identifier to lower<br />
            // our chances of another process creating<br />
            // a mutex with the same name.<br />
<br />
            this.UniqueName =  Assembly.GetExecutingAssembly().GetName().Name + identifier;<br />
<br />
            this.Mutex = new Mutex(true, this.UniqueName, out __firstInstance);<br />
        }<br />
<br />
        // Disposing resources<br />
        ~SingleProgramInstance()<br />
        {            <br />
            this.Dispose();<br />
        }<br />
      <br />
        public bool IsFirstInstance<br />
        {<br />
            get { return __firstInstance; }<br />
        } <br />
        <br />
        public void Dispose()<br />
        {<br />
            if (this.IsFirstInstance && this.Mutex != null)<br />
            {<br />
                this.Mutex.ReleaseMutex();<br />
                this.Mutex = null;<br />
<br />
                GC.SuppressFinalize(this);<br />
            }            <br />
        }       <br />
    }<br />
<br />
class Program<br />
    {<br />
        static void Main(string[] args)<br />
        {<br />
            using (SingleProgramInstance spi = new SingleProgramInstance("zxy123"))<br />
            {<br />
                if (spi.IsFirstInstance)            <br />
                    Console.WriteLine("First Instance");               <br />
<br />
                else                <br />
                    Console.WriteLine("!!!!! NOT First Instance !!!!!!");              <br />
<br />
                spi.Dispose();<br />
            }<br />
<br />
            Console.ReadKey();<br />
<br />
            Process.Start("test73_Mutex.exe");<br />
        }<br />
    }<br />
<br />

Zilo(svk) wrote:

this fails from time to time

Zilo(svk) wrote:

looks like I'll use your solution.

Zilo(svk) wrote:

Can you be more specific ?

Zilo(svk) wrote:

I have an application and I want to keep only one instance running

Zilo(svk) wrote:

I have an application and I want to keep only one instance running

Zilo(svk) wrote:

that may not be refreshed/reloaded while application runs (for simplicity reasons)

Zilo(svk) wrote:

However, it looks that you're not willing to bless my mind with a reason why it doesn't work my way

Zilo(svk) wrote:

I disagree

Zilo(svk) wrote:

My problem is that I'm not able to (always) own mutex in the second application launch (restart) after it was properly released in first one!!!

using System;
using System.Collections.Generic;
using System.Xml.Serialization;
  
// ... namespace not shown
  
public class MainClass {
    private List<IMyInterface> items = new List<IMyInterface>();
  
    [XmlArrayItem(typeof(MySubClass1))]
    [XmlArrayItem(typeof(MySubClass2))]
    [XmlArrayItem(typeof(MySubClass3))]
    public List<IMyInterface> Items {
        get {
            return this.items;
        }
        set {
            this.items = value;
        }
    }
}