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SISTEM OPERASI

   NURHALIMA


    CHAPTER.10




                 NURHALIMA   1
NURHALIMA   2
1. Proses dapat meminta berbagai kombinasi dari sumber daya dibawah ini:
CDROM, soundcard dan
floppy. Jelaskan tiga macam pencegahan deadlock skema yang meniadakan:
• Hold and Wait
• Circular Wait
• No Preemption
2. Diasumsikan proses P0 memegang sumber daya R2 dan R3, meminta sumber daya
R4; P1
menggunakan R4 dan meminta R1; P2 menggunakan R1 dan meminta R3 .
Gambarkan Wait-for
Graph. Apakah sistem terjebak dalam deadlock? Jika ya, tunjukkan proses mana yang
menyebabkan
deadlock. Jika tidak, tunjukkan urutan proses untuk selesai.
3. User x telah menggunakan 7 printer dan harus menggunakan 10 printer. User y
telah menggunakan
1 printer dan akan memerlukan paling banyak 4 printer. User z telah menggunakan 2
printer dan
akan menggunakan paling banyak 4 printer. Setiap user pada saat ini meminta 1
printer. Kepada
siapakah OS akan memberikan grant printer tersebut dan tunjukkan "safe sequence"
yang ada
sehingga tidak terjadi deadlock.
4. Pernyataan manakah yang benar mengenai deadlock:




                                                     NURHALIMA                      3
i. Pencegahan deadlock lebih sulit dilakukan (implementasi) daripada
menghindari deadlock.
ii. Deteksi deadlock dipilih karena utilisasi dari resources dapat lebih optimal.
iii. Salah satu prasyarat untuk melakukan deteksi deadlock adalah: hold and
wait.
iv. Algoritma Banker’s (Djikstra) tidak dapat menghindari terjadinya deadlock.
v. Suatu sistem jika berada dalam keadaan tidak aman: "unsafe", berarti telah
terjadi d

5. User 1 sedang menggunakan x printers dan memerlukan total n printers.
Kondisi umum adalah: y <
-12, n < -12, x < -y, m < -n. State ini safe jika dan hanya jika:
i. x+n<-12 dan y+m<-12 dan x+m<-12
ii. x+n<-12 dan y+m<12 dan x+m<-12
iii. x+n<-12 atau(or) y+m<-12 dan x+m<-12
iv. x+m<-12
v. Semua statement diatas menjamin: safe stateeadlock.




                                                       NURHALIMA                    4

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Os ppt.10

  • 1. SISTEM OPERASI NURHALIMA CHAPTER.10 NURHALIMA 1
  • 3. 1. Proses dapat meminta berbagai kombinasi dari sumber daya dibawah ini: CDROM, soundcard dan floppy. Jelaskan tiga macam pencegahan deadlock skema yang meniadakan: • Hold and Wait • Circular Wait • No Preemption 2. Diasumsikan proses P0 memegang sumber daya R2 dan R3, meminta sumber daya R4; P1 menggunakan R4 dan meminta R1; P2 menggunakan R1 dan meminta R3 . Gambarkan Wait-for Graph. Apakah sistem terjebak dalam deadlock? Jika ya, tunjukkan proses mana yang menyebabkan deadlock. Jika tidak, tunjukkan urutan proses untuk selesai. 3. User x telah menggunakan 7 printer dan harus menggunakan 10 printer. User y telah menggunakan 1 printer dan akan memerlukan paling banyak 4 printer. User z telah menggunakan 2 printer dan akan menggunakan paling banyak 4 printer. Setiap user pada saat ini meminta 1 printer. Kepada siapakah OS akan memberikan grant printer tersebut dan tunjukkan "safe sequence" yang ada sehingga tidak terjadi deadlock. 4. Pernyataan manakah yang benar mengenai deadlock: NURHALIMA 3
  • 4. i. Pencegahan deadlock lebih sulit dilakukan (implementasi) daripada menghindari deadlock. ii. Deteksi deadlock dipilih karena utilisasi dari resources dapat lebih optimal. iii. Salah satu prasyarat untuk melakukan deteksi deadlock adalah: hold and wait. iv. Algoritma Banker’s (Djikstra) tidak dapat menghindari terjadinya deadlock. v. Suatu sistem jika berada dalam keadaan tidak aman: "unsafe", berarti telah terjadi d 5. User 1 sedang menggunakan x printers dan memerlukan total n printers. Kondisi umum adalah: y < -12, n < -12, x < -y, m < -n. State ini safe jika dan hanya jika: i. x+n<-12 dan y+m<-12 dan x+m<-12 ii. x+n<-12 dan y+m<12 dan x+m<-12 iii. x+n<-12 atau(or) y+m<-12 dan x+m<-12 iv. x+m<-12 v. Semua statement diatas menjamin: safe stateeadlock. NURHALIMA 4