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- Architettura dei Calcolatori e Sistemi Operativi
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Sistemi operativi 7 Esercizi concatenati
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Memoria: 13 Esercizi concatenati parametri: MAX_FREE: 3 MIN_FREE: 2 MEM_SIZE: 10 INITIAL_STAC K_SIZE: 3 eventi: 1. exec(2, 0, 0, 4, 4001FA,"X") 2. fork("Q") 3. write ("Pd0", "Pp0", "Pp1”) 4. read("Pc0", "Pp0"), 4 kswapd 5. fork("R") 6. write("Pd1", "pd2") 7. read("Pc0", "Pp0", "pp1"), 4 kswapd 8. write("Pp2") 9. read("Pd0") 10. write("Pd0") 11. contextSwitch("R"), write(“Rp0”) 12. write("Rd0") 13. exit("P"), write(“Pp2”) Soluzione (si riportano solo le strutture dati modificate – colorati gli aspetti più significativi, in rosso le aggiunte, in blu le pagine cancellate, in verde le pagine fisiche liberate da PFRA) 1 - exec(2, 0, 0, 4, 4001FA,"X") PROCESSO: P ********************************************************* VMA : C 000000400, 2 , R , P , M , <X,0> D 000000600, 4 , W , P , A , <‐1,0> P 7FFFFFFFC, 3 , W , P , A , <‐1,0> PT: <c0 :1 R> <c1 :‐ ‐> <d0 :‐ ‐> <d1 :‐ ‐> <d 2 :‐ ‐> <d3 :‐ ‐> <p0 :2 W> <p1 :‐ ‐> <p2 :‐ ‐> process P ‐ NPV of PC and SP: c0, p0 ____MEMORIA FISICA____(pagine libere: 7)_________________________ 00 : <ZP> || 01 : Pc0/<X,0> || 02 : Pp0 || 03 : ‐‐‐‐ || 04 : ‐‐‐‐ || 05 : ‐‐‐‐ || 06 : ‐‐‐‐ || 07 : ‐‐‐‐ || 08 : ‐‐‐‐ || 09 : ‐‐‐‐ || ____STATO del TLB________________________________________________ Pc0 : 01 ‐ 0: 1: || Pp0 : 02 ‐ 1: 1: || ‐‐‐‐‐ || ‐‐‐‐‐ || SWAP FILE: ‐‐‐‐, ‐‐‐‐, ‐‐‐‐, ‐‐‐‐, ‐‐‐‐, ‐‐‐‐, LRU ACTIVE: PP0, PC0, LRU INACT IVE: 2. fork("Q") – si evidenziano gli aspetti relativi alla pagina in cima alla pila PROCESSO: P ********************************************************* VMA : C 000000400, 2 , R , P , M , <X,0> D 000000600, 4 , W , P , A , <‐1,0> P 7FFFFFFFC, 3 , W , P , A , <‐1,0> PT: <c0 :1 R> <c1 :‐ ‐> <d0 :‐ ‐> <d1 :‐ ‐> <d2 :‐ ‐> <d3 :‐ ‐> <p0 :3 W> <p1 :‐ ‐> <p2 :‐ ‐> process P ‐ NPV of PC and SP: c0, p0 PROCESSO: Q…
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