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That s less than 2 percent of the total time per call, not a bad price to pay for the simplicity. Suppose instead the call only takes five seconds to complete:
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The percentage changes to about 17 percent. Depending on performance needs, that may be too high of a price to pay.
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In this chapter we ve discussed how to effectively manage thread interactions. We ve seen that traditional software development concepts, such as encapsulation, can be used in multithreaded development. We ve discussed the most common forms of access control, and explored some less commonly used mechanisms, such as interlocked operations. One of the most important things to get from this chapter is being able to identify where concurrency control is needed, by identifying the thread boundaries we discussed in section 7.1.4. Once you know where the moving parts contact each other, you can use one of the means we discussed to make sure that contact happens in a controlled way. In the next chapter we explore a different type of synchronization control known as a wait handle.
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8.1 8.2 8.3 8.4 The WaitHandle class 143 The AutoResetEvent class 145 WaitHandle 147 ManualResetEvent 154 8.5 Mutex class: WaitOne and ReleaseMutex 156 8.6 Summary 159
WaitHandle-derived classes provide a means of constructing powerful synchronization mechanisms. In this chapter we will cover ManualResetEvent, AutoResetEvent, and Mutex. Just as the Monitor class allows for a thread to wait to acquire a lock on an object, the AutoResetEvent allows a thread to wait for a class derived from WaitHandle to become signaled. Each object derived from WaitHandle has two states: signaled and unsignaled. When an AutoResetEvent becomes signaled, any thread waiting for that event is released from the WaitSleepJoin state, triggering the AutoResetEvent
to return to the unsignaled state. WaitHandle-derived classes have advantages over the Monitor class. One is that it is possible to wait for multiple WaitHandle-derived classes. Using the WaitAll method, a thread can wait until all WaitHandle-derived classes in an array, or for only one, to become signaled. More important, WaitHandle-derived classes allow for interaction between managed and unmanaged code because they expose underlying OS handles. ManualResetEvent is similar to AutoResetEvent, but it differs in its behavior when a thread is waiting. Unlike the AutoResetEvent class that returns to the unsignaled state, ManualResetEvents remain in the signaled state. The Reset method changes ManualResetEvent from signaled to unsignaled. 142
Matrix multiplication explained
The Mutex object is similar to the Monitor object in that it controls access of threads to regions of code. It differs in that it can control access to regions of code in different processes. This allows for robust synchronization at a process level, as well as a thread level. The examples used in this chapter relate to matrix multiplication. Matrix multiplication is the process of combining two matrices to produce a third. The number of columns in the first matrix must equal the number of rows in the second. The resulting matrix will have the same number of rows that the first matrix has and the number of the columns that the second has. Figure 8.1 shows how one matrix is multiplied by the second to produce the third. Notice that to produce the top-left cell of the result matrix, we start by multiplying the cell in the top-left in the first matrix by the top-left in the second. We then add that result to the product of the cell in the first row, second column in the first matrix times the cell in the first column, second row in the second, and so on. Matrix multiplication is being used because it is a relatively common mathematical construct used in many fields. Operations research, computer graphics, statistics, and engineering all use matrix multiplication.
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