process Allocation max ABC ABC 141 562 PO P1 P2 P3 P4 PO PL P2 01 0 111 323 211 P3 P4 210 561 ABC 322 996 321 010 111 323 211 A Avaliable ABC. 200 1. Write the safe sequence of process, if it is safe? 2. If any which process are able to finish and what resources are available before it become unsafe, if it is unsafe? 6) Repear Queation a with the system below: Process Allocation Max ABC 562 ♦ 210 561 996 321 •Allocation and max will tell how much resoures each process need. process Once complexed for that process, all Max will add into the avaliasse. K Avaliable A.BC 200 the

process Allocation max ABC ABC 141 562 PO P1 P2 P3 P4 PO PL P2 01 0 111 323 211 P3 P4 210 561 ABC 322 996 321 010 111 323 211 A Avaliable ABC. 200 1. Write the safe sequence of process, if it is safe? 2. If any which process are able to finish and what resources are available before it become unsafe, if it is unsafe? 6) Repear Queation a with the system below: Process Allocation Max ABC 562 ♦ 210 561 996 321 •Allocation and max will tell how much resoures each process need. process Once complexed for that process, all Max will add into the avaliasse. K Avaliable A.BC 200 the

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a C program which creates a child process to find all txt files in the root directory (i.e., “/") and stores the output in a text file called “all_txt_files.txtť". If the child process execution takes more than t seconds (measured at the parent), the parent should abort the execution of that child. Otherwise, after the child process termination, the parent has to create another child which will count the number of records in all_txt_files.txt and print out the output. The program should not allow the creation of orphan processes. - You need to include the C header file time.h to roughly count the execution time of the child process and play with different values of t so that both cases may happen. Another option may be the alarm system call. - You can use redirection (i.e., “>") to redirect the output of find to a txt file (e.g., find / - name "*. txt" > all_txt_files.txt). It's not a problem if find cannot access some directories. - You can count the number of lines in a txt…
A deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.
Assume that there are the following processes in the deadline scheduler queue: Process Arrival Runtime Period Deadline 1 0 2 12 10 2 2 4 20 16 3 4 3 15 14 Complete the following schedule so each of the processes adheres to the deadline policy by replacing a dot with a process number (as necessary): TIME: 01234567890123456789012345678901234567890123456789 PROCESS: 112222333.......................................
Consider the following code snippet: waitpid(-1, &status, 0); Which of the following correctly describes the purpose of this code snippet? it is equivalent to wait(&status); it causes the parent process to wait for the child process that terminates first and fetch that child's termination status it causes the parent process to wait for the child process whose pid is -1 and fetch that child's termination status The first two choices are both correct None of the above choices are correct Which of the following statements about wait(2) and waitpid(2) are true? The waitpid(2) function can block the caller until a child process terminates, whereas wait(2) has an option that prevents it from blocking. The wait(2) function doesn't wait for the child that terminates first; it has a number of options that control which process it waits for. If a child has already terminated and is a zombie, wait(2) returns immediately with that child's status. Otherwise, it blocks the caller until a child…
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IS THE MECHANISM THAT ENSURES THAT ONLY ONE PROCESS IS DOING CERTAIN EXECUTION AT ONE TIME. Select one: a.MUTUAL EXCLUSION b.COMPETING PROCESSES c.RACE CONDITION d.CRITICAL SECTION
A method that is common to both shared and unique pointers is get. What does this method do? Returns the address of the managed object There is no such method get. Returns the reference count of the managed object O Returns the reference to the managed object in raw pointer form.
A Deadlock condition in which, multiple processes are not allowed to use the same resource at the same time. This condition is known as a. Mutual Exclusion O b. Hold and Wait O c. No Preemption O d. Circular Wait
Consider the following policies for preventing deadlock in a system with mutually exclusive resources: 1. Processes acquire all their resources at the beginning of execution. If any resource is not available, all acquired resources are released. 2. The resources are numbered uniquely. Processes can only request resources in increasing resource numbers. 3. The resources are numbered uniquely. Processes can only request resources in decreasing resource numbers. 4. The resources are numbered uniquely. Processes can only request a resource with a resource number larger than its currently held resource.Question: Which of the above policies can be used for preventing deadlock? Group of answer choices 1)The resources are numbered uniquely. Processes can only request resources in decreasing resource numbers 2)The resources are numbered uniquely. Processes can only request resources in increasing resource numbers 3)The resources are numbered uniquely. Processes can only request a…
IS THE MECHANISM THAT ENSURES THAT ONLY ONE PROCESS IS DOING CERTAIN EXECUTION AT ONE TIME. Select one: a.MUTUAL EXCLUSION b.CRITICAL SECTION c.RACE CONDITION d.COMPETING PROCESSES DOO
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