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Now, if an application s thread enters into an infinite loop, Windows will periodically preempt that thread, assign a different thread to an actual CPU, and let this other thread run for a while This other thread could be Task Manager s thread and now, the end user can use Task Manager to kill the process containing the thread that is in an infinite loop When doing this, the process dies and all the data it was working on is destroyed, too, but all other processes in the system continue to run just fine without losing their data Of course, the user doesn t have to reset the machine and reboot, so context switches are required to provide end users with a much better overall experience at the cost of performance In fact, the performance hit is much worse than you might think .

It s easier to change code later when this approach is used, and the code tends to be easier to read This disciplined use of global data is a prime example of the distinction between programming in vs programming into a language, which is discussed more in Section 344, Program Into Your Language, Not In It Emulation of enumerated types You can also use global variables to emulate enumerated types in languages such as Python that don t support enumerated types directly Streamlining use of extremely common data Sometimes you have so many references to a variable that it appears in the parameter list of every routine you write Rather than including it in every parameter list, you can make it a global variable In cases in which a variable seems to be accessed everywhere, however, it rarely is.

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Yes, a performance hit occurs when Windows context switches to another thread But the CPU was executing another thread, and the previously running thread s code and data reside in the CPU s caches so that the CPU doesn t have to access RAM memory as much, which has significant latency associated with it When Windows context switches to a new thread, this new thread is most likely executing different code and accessing different data that is not in the CPU s cache The CPU must access RAM memory to populate its cache so it can get back to a good execution speed But then, about 30 ms later, another context switch occurs The time required to perform a context switch varies with different CPU architectures and speed .

Usually it s accessed by a limited set of routines you can package into a class with the data they work on More on this later Eliminating tramp data Sometimes you pass data to a routine or class merely so that it can be passed to another routine or class For example, you might have an error-processing object that s used in each routine When the routine in the middle of the call chain doesn t use the object, the object is called tramp data Use of global variables can eliminate tramp data..

And the time required to build up a CPU s cache depends on what applications are running in the system, the size of the CPU s caches, and various other factors So it is impossible for me to give you an absolute figure or even an estimate as to what time overhead is incurred for each context switch Suffice it to say that you want to avoid using context switches as much as possible if you are interested in building high-performing applications and components Important At the end of a time-slice, if Windows decides to schedule the same thread again.

Figure 4.18 Additional source control configuration. Check out on the build agent, choose the default working directory with cleanup, and don t use labeling.

(rather than switching to another thread), then Windows does not perform a context switch . Instead, the thread is allowed to just continue running . This improves performance significantly, and avoiding context switches is something you want to achieve as often as possible when you design your code .