By Joe Duffy

Writer Joe Duffy has risen to the problem of explaining the way to write software program that takes complete benefit of concurrency and parallelism. In Concurrent Programming on home windows, he explains the right way to layout, enforce, and keep large-scale concurrent courses, basically utilizing C# and C++ for Windows.

Concurrent Programming on home windows has 4 significant sections: the 1st introduces concurrency at a excessive point, by means of a piece that makes a speciality of the elemental platform good points, internal workings, and API information.

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Example text

We can quickly label the operations that do not act on shared state because there are so few (just one). The only memory location not shared with other threads is the x variable, so the x++ statement doesn't modify shared state. (Similar to the statement above about type safety, we are relying on the fact that we haven't previously shared the address of x on the thread's stack with another thread. Of course, another thread might have found an address to the stack through some other means and could perform address arithmetic to access x indirectly, but this is a remote possibility.

Depending on the statistical improbability of such things is seriously discouraged . ) This interleaved history can happen quite easily, for obvious reasons, if tl and t2 were running on separate processors. The frequency depends on the frequency with which the rou­ tine is accessed, among other things. info M a n a g i n g Prog r a m State incremented its private value. The probability of this happening is higher on a machine with multiple processors, but just having multiple threads running on a single processor machine is enough.

And, more often than not, shared state must be managed carefully and with a great eye for detail. This is also why under­ standing and debugging concurrent code that someone else wrote is often very difficult. State Machines and Time All programs are state machines. Not all people think of their programs this way, but it turns out to be a convenient mental model for concurrent pro­ grams. Even if you don't think about your program as a state machine proper, you probably at least think about your program in terms of time and the sequence of program events on a sequential timeline: the order in which reads from and writes to variables occur, the time distance between two such events, and so on.

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