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Q. What are two differences among user-level threads and kernel-level threads? Under what situations is one type better than the other?
Answer:
(1) User-level threads are unidentified by the kernel whereas the kernel is aware of kernel threads.
(2) On systems utilizing either M:1 or M:N mapping user threads are scheduled by the thread library and the kernel schedules kernel threads.
(3) Kernel threads require not be associated with a process where as each user thread belongs to a process. Kernel threads are usually more expensive to maintain than user threads as they must be represented with a kernel data structure.
Buddy system of memory allocation Free memory is used to maintain in linked lists, each of similar sized blocks. Every block is of size 2^k. When some memory is needed by a th
Q. In following Section we mentioned that disabling interrupts frequently could affect the system's clock. Describe why it could and how such effects could be minimized.
Q. The wait() statement in every Java program examples was part of a while loop. Describe why you would always need to use a while statement when using wait() and why you would ne
Suppose your process starts up, and allocates some memory with malloc(). The allocator will then give part of a memory page to your process. The OS then updates the corresponding p
single pass assembler
Q. Likewise some systems support many types of structures for a file's data while others simply support a stream of bytes. What are the merits in addition to demerits? Answer:
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Write on short note DMA. Direct M emory Access (DMA) is a technique for transferring data from main to a device without passing it through the CPU. Computers that have
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The principle is that of ordinary addition; however remember the highest number is 1. Calculate the following: 11001 + 11
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