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Concept of Reentrancy
It is a useful, memory-saving method for multiprogrammed timesharing machines. A Reentrant method is one in which multiple clients can share a single copy of a program during the similar period. Reentrancy has 2 key functions: The program code cannot change itself, and the local data for each client process must be stored in different disk. Thus, the permanent phase is the code, and the temporary phase is the pointer back to the calling function and local variables needed by that code. Each operation instance is known as activation. It runs the code in the permanent phase, but has its permanent copy of local parameters or variables. The temporary phase associated with each activity is the activation record. usually, the activation record is store on the stack.
diffenciet between least recently used and not recently used
Synchronization serves two purposes: 1) to ensure safety for updates on shared data (e.g. to avoid races conditions), and 2) to coordinate and order actions taken by threads (e.g.
How are file sharing and protection implemented? To implement file protection and sharing, the system ought to maintain more file and directory attributes than are needed on a
Direct memory access Many computers avoid burdening the main CPU with programmed I/O by offloading sine if this work to a special-purpose processor known as a direct memory add
Question: (a) Answer the following questions based on the code snippet below. 1. int main (int argc, char *argv[]) 2. { 3. 4. pid_t processId; 5. 6. processId =
Scalability : Scalability is the competence of the system to adapt to increased service load. A scalable system will respond more gracefully to increased load than a non-sc
Q. Some untimely computers protected the operating system by placing it in a memory partition that couldn't be modified by either the user job or the operating system itself. Expl
explain dynamic patrician stratagies
What is low-level formatting? Before a disk can kept data, it must be required into sectors that the disk controller can read and write. This procedure is called low-level form
Q. Could you replicate a multilevel directory structure with a single-level directory structure in which arbitrarily long names can be used? If your answer is yes describe how you
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