To ensure no preemption, if a process is holding some resources and requests another resource that cannot be immediately allocated to it
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| 78. | To ensure no preemption, if a process is holding some resources and requests another resource that cannot be immediately allocated to it : |
| a. | then the process waits for the resources be allocated to it |
| b. | the process keeps sending requests until the resource is allocated to it |
| c. | the process resumes execution without the resource being allocated to it |
| d. | then all resources currently being held are preempted |
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- 56. In the multiprogramming system, a set of processes is deadlock if each process in the set is waiting for an event to occur that can be initialized only by another process in the set. Which of the following is not one of the four conditions that are necessary for deadlock to occur? a. nonpreemption b. process suspension c. partial assignment of resources d. circular waitFacts: Facts about Deadlock Deadlock is a situation that occurs in OS when any process enters a waiting state because another waiting process is holding the demanded resource. Deadlock is a common problem in multi-processing where several processes share a specific type of mutually exclusive resource known as a soft lock or software. Deadlock is a situation where a process or a set of processes is blocked, waiting for some other resource that is held by some other waiting process. It is an undesirable state of the system. The following are the four conditions that must hold simultaneously (Links to an external site.) for a deadlock to occur. Mutual Exclusion –A resource can be used by only one process at a time. If another process requests for that resource then the requesting process must be delayed until the resource has been released. Hold and wait –Some processes must be holding some resources in nonshareable mode and at the same time must be waiting to acquire some more…76. To ensure that the hold and wait condition never occurs in the system, it must be ensured that : a. whenever a resource is requested by a process, it is not holding any other resources b. each process must request and be allocated all its resources before it begins its execution c. a process can request resources only when it has none d. all of the mentioned
- Modern Operating Systems must tackle the challenges of Synchronization and Deadlock. ’Process Synchronization’ is the task of coordinating the execution of processes in a way that no two processes can have access to the same shared data or resource. A process requesting a resource may have to wait, if the resource is not available at that time. Sometimes, a waiting process is never able to change state, because the resources it has requested are held by other waiting processes; this situation is called ’Deadlock'.Modern Operating Systems must tackle the challenges of Synchronization and Deadlock. 'Process Synchronization' is the task of coordinating the execution of processes in a way that no two processes can have access to the same shared data or resource. A process requesting a resource may have to wait, if the resource is not available at that time. Sometimes, a waiting process is never able to change state, because the resources it has requested are held by other waiting processes; this situation is called 'Deadlock'. In concurrent programming, a "critical section" is a part of a multi-process program thatmay not be concurrently executed by more than one of the program's thread. Let us consider a 2 processes solution: do {flag[i] = TRUE;while(flag[j]); %waitCRITICAL SECTIONflag[i] = FALSE;REMAINDER SECTION} while (TRUE);Pseudo-code of $P_i$ (the one of $P_j$ is symmetric) a) Does the given solution satisfy the mutual exclusion requirement? Explain (asimple 'yes-no' answer is NOT enough.…Critical Sections - Select all of the following statements that are true A critical section is a segment of code in which a process has write-access to data or resources that are shared with at least one other process. Every process waiting to enter a critical section must be allowed to enter it at some point. No eternal waiting must be possible. In a system consisting of n processes, a critical section protected by a mutex variable can be accessed by more than one process at a time. A process not executing in a critical section must not prevent other processes from entering the critical section. Critical sections must never contain data shared by multiple processes. O DELL W
- Part IV: Scheduling. Suppose that processes P1, P2, ..., P4 arrive for execution at the times indicated in Table below. Each process will run for the amount of time listed, and will be assigned a priority ranging from 0 (highest) to 10 (lowest). No more processes will arrive until the last process completes. In answering the questions, base all decisions on the information you have at the time the decision must be made. Arrival Time Process Priority Burst Time 8 P1 P2 10 4 5 P3 5 P4 8 2 1 1) Draw two Gantt charts that illustrate the execution of these processes using the following scheduling algorithms: a) Non-preemptive Priority b) Round Robin (Quantum time is 4) c) What is the waiting time for non-preemptive Priority scheduling algorithm?10. A system has 3 processes sharing 4 resources. If each process needs a maximum of 2 units, then a. deadlock can never occur b. deadlock may occur c. deadlock has to occur d. none of these104. The process to be aborted is chosen on the basis of the following factors : a. priority of the process b. process is interactive or batch c. how long the process has computed d. all of the mentioned
- Resource requests may be made by those who have reached a halt owing to the finding of deadlocks in their processes.Modern Operating Systems must tackle the challenges of Synchronization and Deadlock. 'Pro- vess Synchronization' is the task of coordinating the execution of processes in a way that no two processes can have access to the same shared data or resource. A process requesting a resource may have to wait, if the resource is not available at that time. Sometimes, a waiting process is never able to change state, because the resources it has requested are held by other waiting processes; this situation is called 'Deadlock'. ,In concurrent programming, a "critical section" is a part of a multi-process program that (a) may not be concurrently executed by more than one of the program's thread. Let us consider a 2 processes solution: do { flag(i] - TRUE; while (flag[j]); %wait CRITICAL SECTION flag[i] - FALSE; REMAINDER SECTION } while (TRUE); Pseudo-code of $P_i$ (the one of $P_j$ is symmetric) (i) { simple 'yes-no' answer is NOT enough. What is the mutual exclusion requirement? Why is (not?)…Operating Systems Summer Term Final 2021 2- Which of the following is false? a) O Dispath latency is the time spent for saving state of currently running process and restoring state from process control block of newly selected process to run b) When the currently running process release the CPU because it made an 1/O call, it is called voluntary context switch. c)OWhen nonpreemptive scheduling is used, a process that is currently running do not release CPU until it terminates or it switches to waiting state d) O Windows and Linux OS use preemtive scheduling whereas MacOs and Linux use nonpreemptive scheduling Boş bırak KÖnceki 2/10 Sonraki> Каpat Cevap Lis 1.