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Windows operating system never detects that a thread is blocked on a primitive user-mode construct Since a thread pool thread blocked on a user-mode primitive construct is never considered blocked, the thread pool will not create a new thread to replace the temporarily blocked thread In addition, these CPU instructions block the thread for an incredibly short period of time Wow! All of this sounds great, doesn t it And it is great, which is why I recommend using these constructs as much as possible However, there is a downside: Only the Windows operating system kernel can stop a thread from running so that it is not wasting CPU time A thread running in user mode can be preempted by the system, but the thread will be scheduled again as soon as possible .

charType = charTypeTable[ inputChar ];

So a thread that wants to acquire some resource but can t get it spins in user mode This potentially wastes a lot of CPU time, which would be better spent performing other work or even just letting the CPU go idle to conserve power This brings us to the primitive kernel-mode constructs The kernel-mode constructs are provided by the Windows operating system itself As such, they require that your application s threads call functions implemented in the operating system kernel Having threads transition from user mode to kernel mode and back incurs a big performance hit, which is why kernelmode constructs should be avoided 2 However, they do have a positive feature: When a thread uses a kernel-mode construct to acquire a resource that another thread has, Windows blocks the thread so that it is no longer wasting CPU time .

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This fragment assumes that the charTypeTable array has been set up earlier. You put your program s knowledge into its data rather than into its logic in the table instead of in the if tests.

\CiDotNet.Calc.Test.dll </TestAssemblies> </PropertyGroup> <Target Name="Build" > <MSBuild Targets="Clean;Rebuild" Projects="CiDotNet.sln" ContinueOnError="false" /> </Target> <Target Name="Test" > <Exec Command="lib\NUnit\nunit-console.exe $(TestAssemblies)

Then, when the resource becomes available, Windows resumes the thread, allowing it to access the resource A thread waiting on a construct might block forever if the thread currently holding the construct never releases it If the construct is a user-mode construct, the thread is running on a CPU forever, and we call this a livelock If the construct is a kernel-mode construct, the thread is blocked forever, and we call this a deadlock Both of these are bad, but of the two, a deadlock is always preferable to a livelock because a livelock wastes both CPU time and memory (the thread s stack, etc ), while a deadlock wastes only memory 3 In an ideal world, we d like to have constructs that take the best of both worlds .

When you use table-driven methods, you have to address two issues: First you have to address the question of how to look up entries in the table. You can use some data to access a table directly. If you need to classify data by month, for example, keying into a month table is straightforward. You can use an array with indexes 1 through 12. Other data is too awkward to be used to look up a table entry directly. If you need to classify data by social security number, for example, you can t use the social security number to key into the table directly unless you can afford to store 999-99-9999 entries in your table. You re forced to use a more complicated approach. Here s a list of ways to look up an entry in a table:

That is, we d like a construct that is fast and non-blocking (like the user-mode constructs) when there is no contention But when there is contention for the construct, we d like it to be blocked by the operating system kernel Constructs that work like this do exist; I call them hybrid constructs, and I will discuss them in 29 It is very common for applications to use the hybrid constructs because in most applications, it is rare for two or more threads to attempt to access the same data at the same time A hybrid construct keeps your application running fast most of the time, and occasionally it runs slowly to block the thread The slowness usually doesn t matter at this point because your thread is going to be blocked anyway ..

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