Download Advanced Windows Nt: The Developer's Guide to the Win32 by Jeffrey Richter PDF

By Jeffrey Richter

Assuming an information of 16-bit home windows programming, this e-book explains what's new and assorted approximately home windows NT and information what programmers want to know to use the function or mechanism of their courses. The publication comprises chapters on NT's robust memory-management method, concerns on the subject of multitasking and a bit explaining NT's differently opaque message-passing approach with a robust piece of code referred to as "message crackers".

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Windows NT never assigns a suspended thread to a CPU until that thread is somehow resumed. A thread that is suspended because no window messages are available is resumed by the system as soon as a message appears in that thread's queue. Later in this chapter, we'll discuss other ways that threads can be suspended and resumed. Threads are assigned priorities. Priorities range from 1 to 31, with 31 representing the highest priority. When the Windows NT Kernel assigns a thread to a CPU, it treats all threads of the same priority as equal.

The Task Manager is very well-behaved. Most of the time it simply sits idle, not requiring any CPU time at all. If this were not the case, the whole system would perform much more slowly, and many applications would not respond. The REALTIME_PRIORITY_CLASS flag should almost never be used. In fact, earlier betas of the Win32 API did not expose this priority class to applications even though it was part of the Windows NT Kernel. Realtime priority is extremely high, and because most threads execute at a lower priority, they will be affected by a process with this class.

This is necessary because it's possible to write code like this: int *p = &errno; if (*p == ENOMEM) { . . } If the internal _errno function simply returned the value of errno, the above code wouldn't compile. The multithreaded version of the C Runtime Library also places synchronization primitives around certain functions. For example, if two threads simultaneously call malloc, the heap could possibly become corrupted. The multithreaded version of the C Runtime Library prevents two threads from allocating memory from the heap at the same time.

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