How to avoid deadlock in c#?

To avoid deadlock you can use  Monitor.TryEnter  instead of lock.

In the below example, DoWork1 will acquire lock on staticObjLock2 for 10 Seconds. If lock cannot be acquired it prints a message and return.

 

Example:- 

 

class Program

    {

        private static object staticObjLock1 = new object();

        private static object staticObjLock2 = new object();

 

 

        static void Main()

        {

                     Thread thread1 = new Thread(DoWork1);

            Thread thread2 = new Thread(DoWork2);

 

            thread1.Start();

            thread2.Start();

 

            thread1.Join();

            thread2.Join();

 

            Console.WriteLine("Processing done!");

            Console.ReadLine();

 

 

         }

 

        private static void DoWork1()

        {

            lock (staticObjLock1)

            {

                Console.WriteLine("try to accquire lock on objectB");

                Thread.Sleep(1000);

                if (Monitor.TryEnter(staticObjLock2, 10000))

                {

                    try

                    {

                        // this will never execute

                        Console.WriteLine("in DoWork2 critical section");

                    }

                    finally

                    {

                        Monitor.Exit(staticObjLock2);

                    }

                }

                else

                {

                    Console.WriteLine("Unable to acquire lock.");

                }

            }

        }

        private static void DoWork2()

        {

            lock (staticObjLock2)

            {

                Console.WriteLine("try to accquire lock on objectA");

                //Thread.Sleep(1000);

                lock (staticObjLock1)

                {

                    // this will never execute

                    Console.WriteLine("in DoWork2 critical section");

                }

            }

        }

 

    }