An operating system (OS) is a basic software whose rule is to intermediate software requisitions for resources and the hardware available, manage input/output, memory allocation/deallocation, file systems, among other basic tasks a device should do.

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Semaphore : one for each shared resource?

Normally semaphores are implemented as integer variables. The value of a semaphore represents initially the number of processes that are allowed to access the shared resource at the same time, which ...
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Why user threads are mapped to Kernel threads

Since user threads are mapped to kernel threads, why don't we create all threads as kernel threads that is a process with zero user thread. Doesn't mapping of user thread to kernel thread create ...
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Clarification in steps OS takes during a page fault, related to TLB

I am reading the book operating systems by Galvin, and there is something I don't understand. Assume that there is a hardware managed Translation Lookaside Buffer (TLB). Now when a program requests ...