Definition and Use of System Threads
A thread is a unit of execution. Each thread maintains an independent program counter and hardware context that includes a private set of CPU registers. Each thread maintains a priority value that determines when it gains control of the system processor(s). In general, the higher a thread's priority, the more likely it is to receive control.
Threads can operate in user mode or kernel mode. A system thread is one that runs exclusively in kernel mode. It has no user-mode context and cannot access user address space. Just like a Win32 thread, a system thread executes at or below APC_LEVEL IRQL and it competes for use of the CPU based on its scheduling priority.
When To Use Threads
There are several reasons ...
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