Semaphores are crucial for managing access to shared resources in concurrent programming, particularly in .NET. They differ from mutexes, allowing multiple threads to access resources simultaneously based on defined limits. A practical example is provided with a FileLogger class in C#, showcasing the use of a Mutex for locking in scenarios where multiple threads might attempt to write to a log file. This example illustrates critical section management, demonstrating resource synchronization in multi-threaded applications.
A semaphore is used to limit the number of threads that have access to a shared resource at the same time, enabling non-exclusive locking and concurrency control.
In .NET, we utilize the System.Threading.Semaphore class to manage semaphores, which allow multiple threads to access a shared resource based on the defined limits.
A Mutex object in .NET can be created with the Mutex class, using WaitOne to lock a resource and ReleaseMutex to unlock it, ensuring thread safety.
The FileLogger class demonstrates how to synchronize access to a shared resource, in this case, a text file, using a Mutex to prevent simultaneous writes.
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