That means only one thread exits from the critical section. We can also pass a parameter to Release method to defines how many threads are actually exits. It allows waiting threads to enter into a critical section.īy default Release method only increment the counter by 1. When a thread exits from the critical section, it must call the Release method to increment the counter maintained by semaphore object. In the above example, if calling thread does not receive signal within specified 4 seconds, then it returns false. If thread has not received signal within a time internal specified, It returns false value.īool isSignalled = semaphoreObject.WaitOne(TimeSpan.FromSeconds(4)) In another overload of semaphore WaitOne method, we can pass the time interval for which a thread can wait to get a signal from semaphore. If the Int32 variable maintained by semaphore is greater than 0 then it allows calling thread to enter.īelow is the syntax of calling WaitOne method. They called the WaitOne method on semaphore object. Threads can enter into the critical section by using WaitOne method. Semaphore semaphoreObject = new Semaphore(initialCount: 0, maximumCount: 5, name: "MyUniqueNameApp") WaitOne Method This string parameter is a unique string which is used for using semaphore between multiple process.īelow is the syntax of creating semaphore. Used semaphore between multiple processesĪlternatively semaphore has another constructor which takes additional string as parameter. If we set the maximum count of 3 and initial count of 3, that means maximum 3 threads can enter into a critical section and there is no threads currently in the critical section.
That means 3 threads are already in the critical section. For example if we set the maximum count of 3 and initial count of 0. Maximum count defines how many maximum threads can enter into a critical section. InitialCount set the value of Int32 variable. We initialize semaphore object with two parameters: Semaphore semaphoreObject = new Semaphore(initialCount: 0, maximumCount: 5) When the Int32 variable is 0, no thread can enters into a critical section.īelow is the syntax of C# semaphore initialization. When a thread enters into a critical section, it decreases the Int32 variable with 1 and when a thread exits from a critical section, it increases the Int32 variable with 1.
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