Книга: Microsoft Windows Embedded CE 6.0 Exam Preparation Kit

Experiment with Multithreaded Applications and Critical Sections

Experiment with Multithreaded Applications and Critical Sections

Use critical section objects in a multithreaded application to protect access to a global variable. Complete the following tasks:

1. Create two threads in the main code of the applications and in the thread functions wait two seconds (Sleep(2000)) and three seconds (Sleep(3000)) in an infinite loop. The primary thread of the application should wait until both threads exit by using the WaitForMultipleObjects function.

2. Create a global variable and access it from both threads. One thread should write to the variable and the other thread should read the variable. By accessing the variable before and after the first Sleep and displaying the values, you should be able visualize concurrent access.

3. Protect access to the variable by using a CriticalSection object shared between both threads. Grab the critical section at the beginnings of the loops and release it at the ends of the loops. Compare the results with the previous output.

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