Deadlock in c#? What is deadlock in c#?

Deadlock is a situation where an application locks up because more than one process are waiting for each other to finish.

Deadlock occurs when each of two threads try to acquire a lock on a resources already locked by another.

Thread 1 locked on resources 1 tries to acquire a lock on resources 2. At the same time, thread 2 has a lock on resources 2 and tries to acquire lock on resources 1. These two threads never give up their locks, hence a Deadlock occurs.

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);

                lock (staticObjLock2)

                {

                    // this will never execute

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

                }

            }

        }

        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");

                }

            }

        }

 

    }