(A) OS maintains only scheduling and accounting information for
each thread.
(B) OS maintains only CPUregisters for each thread.
(C) OS does not maintain a separate stack for each thread.
(D) OS does not maintain virtual memory state for each thread.
Answer B.
Explanation.
A thread is the light weight process that can be scheduled for
execution. All threads of a process share its virtual address space and system
resources. In addition, each thread maintains exception handlers, a scheduling
priority, thread local storage, a unique thread identifier, and a set of
structures the system will use to save the thread context until it is
scheduled. The thread context includes the thread's set of machine registers,
the kernel stack, a thread environment block, and a user stack in the address
space of the thread's process.
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