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A semaphore is similar to a mutex except that it can grant more than one thread access to a shared resource at the same time Thus, the semaphore is useful when a collection of resources is being synchronized A semaphore controls access to a shared resource through the use of a counter If the counter is greater than zero, then access is allowed If it is zero, access is denied What the counter is counting are permits Thus, to access the resource, a thread must be granted a permit from the semaphore In general, to use a semaphore, the thread that wants access to the shared resource tries to acquire a permit If the semaphore s counter is greater than zero, the thread acquires a permit, which causes the semaphore s count to be decremented Otherwise, the thread will block until a permit can be acquired When the thread no longer needs access to the shared

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From equation ( ) we may immediately conclude that P = 6000 Substituting this into ( ) gives 10000 = 6000 ( eK ) 2 We conclude that eK = 5 3

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resource, it releases the permit, which causes the semaphore s count to be incremented If there is another thread waiting for a permit, then that thread will acquire a permit at that time The number of simultaneous accesses permitted is specified when the semaphore is created If you create a semaphore that allows only one access, then a semaphore acts just like a mutex Semaphores are especially useful in situations in which a shared resource consists of a group or pool For example, a collection of network connections, any of which can be used for communication, is a resource pool A thread needing a network connection doesn t care which one it gets In this case, a semaphore offers a convenient mechanism to manage access to the connections The semaphore is implemented by SystemThreadingSemaphore It has several constructors The simplest form is shown here: public Semaphore(int initialCount, int maximumCount) Here, initialCount specifies the initial value of the semaphore permit counter, which is the number of permits available The maximum value of the counter is passed in maximumCount Thus, maximumCount represents the maximum number of permits that can granted by the semaphore The value in initialCount specifies how many of these permits are initially available Using a semaphore is similar to using a mutex, described earlier To acquire access, your code will call WaitOne( ) on the semaphore This method is inherited by Semaphore from the WaitHandle class WaitOne( ) waits until the semaphore on which it is called can be acquired Thus, it blocks execution of the calling thread until the specified semaphore can grant permission When your code no longer needs ownership of the semaphore, it releases it by calling Release( ), which is shown here: public int Release( ) public int Release(int releaseCount) The first form releases one permit The second form releases the number of permits specified by releaseCount Both return the permit count that existed prior to the release It is possible for a thread to call WaitOne( ) more than once before calling Release( ) However, the number of calls to WaitOne( ) must be balanced by the same number of calls to Release( ) before the permit is released Alternatively, you can call the Release(int) form, passing a number equal to the number of times that WaitOne( ) was called Here is an example that illustrates the semaphore In the program, the class MyThread uses a semaphore to allow only two MyThread threads to be executed at any one time Thus, the resource being shared is the CPU.

// Use a Semaphore using System; using SystemThreading; // This thread allows only two instances of itself // to run at any one time class MyThread { public Thread Thrd;

EXERCISE 17: Revise to Create Proper Emphasis and Increase Clarity Barry, a sales manager for a large printer, explains, I m always wordy I nd myself writing run-on sentences and I don t use modi ers well Take a look at Barry s E-mail draft asking his sales staff for their analysis of why sales are down