![]() Consider two processes P1 and P2 are waiting for one another to relinquish control on the resources R1 and R2 held by each other. Let us understand deadlock with an example. Circular Wait: This is a condition in which two or more threads are waiting for a resource acquired by the next member in the chain.No Pre-emption: If a thread has acquired a resource, it cannot be taken away from the thread until it relinquishes control of the resource voluntarily.Hold and Wait: This is a condition in which a thread is holding at least one resource and waiting for a minimum of one resource already acquired by another thread.Mutual Exclusion: This implies that only one thread can have access to a resource at a particular time.In other words, deadlock is a scenario in which a group of concurrent processes is stalled because one process is holding a resource while waiting for another resource that has already been obtained by another process.ĭeadlock can occur if the following conditions hold true: What is a Thread Deadlock in C#? Why Does it Occur?ĭeadlock is a blocking situation in which a set of concurrent processes share the same resource and are stalled by each other because they are attempting to access a resource already locked by another process. You can take advantage of the Semaphore, SemaphoreSlim, and ReaderWriterLockSlim classes to implement non-exclusive locks in C#. Non-exclusive locks provide read-only access to a shared resource and limit concurrency, i.e., limit the number of concurrent accesses to a shared resource. You can implement exclusive locks using the lock keyword (syntactic sugar for the static methods of the Monitor class) and the Mutex and SpinLock classes in C#. Exclusive lockĪn exclusive lock makes sure that only one thread can gain access or enter a critical section at any given point in time. ![]() There are two types of locks that determine access to shared resources – exclusive lock and non-exclusive lock. When a process or a thread wants to access an object, it requests a lock on that object. Thread synchronization provides support for ordering so that you can orchestrate your threads to perform the tasks as per your plan.Įxclusive Lock and Non-Exclusive Lock Thread Locks in C# Usually, you don’t have much control over all this, which is one reason for race conditions. Ordering – You might often want two or more threads to perform a task in a predictable order or restrict access to shared resources to a particular number of threads only.These critical sections are executed atomically – by one and only one thread. ![]() The code segment that contains the necessary instructions for this is known as the critical section.
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