Visual Basic 2005 for Programmers: Deitel Developer Series, Second Edition

15.5. Thread Synchronization and Class Monitor

Often, multiple threads of execution manipulate shared data. If threads with access to shared data simply read that data, then any number of threads can access the data simultaneously without problems. However, when multiple threads share data and the data is modified by one or more of the threads, then indeterminate results may occur. If one thread is in the process of updating the data and another thread tries to update it too, the data will reflect only the later update. If the data is an array or other data structure in which the threads could update separate parts of the data concurrently, it is possible that part of the data will reflect the information from one thread while another part of ...