A computer system consists of hardware, system programs, and application programs figs 6

... program and data User program and data Operating System Address 0xFFFFFFFF Limit Base 0 (a) User-2 data User-1 data User program Operating System Base-2 Limit-2 Limit-2 Limit-1 Base-2 Base-1 (b) Limit-1 Base-1 ... model in a distributed system. Banking system Airline reservation Operating system Web browser Compilers Editors Application programs Hardware System progr...

Ngày tải lên: 28/04/2014, 16:35

... of a global vari- able. Thread 1's code Thread 2's code Thread 1's stack Thread 2's stack Thread 1's globals Thread 2's globals Fig. 2-17. Threads can have private ... equal. Now we are engaged in a great civil war testing whether that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battlefield of t...

Ngày tải lên: 28/04/2014, 16:35

... Demonstration that the state in (a) is safe. A B C 3 2 2 9 4 7 Free: 3 (a) A B C 4 2 2 9 4 7 Free: 2 (b) A B C 4 4 —4 2 9 7 Free: 0 (c) A B C 4 — 2 9 7 Free: 4 (d) Has Max Has Max Has Max Has Max Fig. ... 3-10. Demonstration that the state in (b) is not safe. A B C D 0 0 0 0 6 Has Max 5 4 7 Free: 10 A B C D 1 1 2 4 6 Has Max 5 4 7 Free: 2 A B C D 1 2 2 4 6 Has Max 5 4 7 F...

Ngày tải lên: 28/04/2014, 16:35

... vector. (a) (b) (c) A0 A1 A2 A3 A4 A5 B0 B1 B2 B3 B4 B5 B6 C1 C2 C3 A0 A1 A2 A3 A4 A6 B0 B1 B2 B3 B4 B5 B6 C1 C2 C3 A0 A1 A2 A3 A4 A5 B0 B1 B2 A6 B4 B5 B6 C1 C2 C3 Age 10 7 5 4 6 3 9 4 6 2 5 6 12 3 5 6 Fig. ... possibilities also exist. Page faults/sec Number of page frames assigned A B Fig. 4-29. Page fault rate as a function of the number of page fr...

Ngày tải lên: 28/04/2014, 16:35

... 5- 16. Layers of the I/O system and the main functions of each layer. Parameter IBM 360 -KB floppy disk WD 18300 hard disk Number of cylinders 40 1 060 1 Tracks per cylinder 2 12 Sectors per track ... RAID levels 0 through 5. Backup and parity drives are shown shaded. Spiral groove Pit Land 2K block of user data Fig. 5-20. Recording structure of a compact disc or CD-ROM. Pre...

Ngày tải lên: 28/04/2014, 16:35

... 16K Disk space utilization (percent) Data rate (KB/sec) Disk space utilization Data rate Block size (bytes) Fig. 6- 20. The solid curve (left-hand scale) gives the data rate of a disk. The dashed ... numbers 86 234 897 422 140 223 223 160 1 26 142 141 1001101101101100 0110110111110111 1010110110110110 0110110110111011 1110111011101111 1101101010001111 0000111011010111 10111011011011...

Ngày tải lên: 28/04/2014, 16:35

... processes, each displaying a movie. The frame rates and processing requirements per frame are different for each movie. A1 A1 A1 B1 B1 A2 A2 A2 A3 A3 B3 A4 A3 B3 A4 A5 B4 A5 B4 A4 A5 B1 B2 B2 B2 B3 ... video server A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 (a) A0 A4 B0 B4 C0 C4 D0 D4 A1 A5 B1 B5 C1 C5 D...

Ngày tải lên: 28/04/2014, 16:35

... 2 Run-time system Operating system Shared memory Application Hardware Run-time system Operating system Application Hardware (b) Machine 1 Machine 2 Run-time system Operating system Shared memory Application Hardware Run-time system Operating system Application Hardware (c) Machine ... memory Application Hardware Run-time system Operating system Application Hard...

Ngày tải lên: 28/04/2014, 16:35

... (b) After the procedure A has been called. (c) Buffer overflow shown in gray. (a) First page (in memory) Second page (not in memory) Page boundary A A A A A A (b) B A A A A A (c) F A A A A A Fig. ... capability. Goal Threat Data confidentiality Exposure of data Data integrity Tampering with data System availability Denial of service Fig. 9-1. Security goals and t...

Ngày tải lên: 28/04/2014, 16:35

... parent Allocate child's stack and user area Fill child's user area from parent Allocate PID for child Set up child to share parent's text Copy page tables for data and stack Set up sharing ... Description s = brk(addr) Change data segment size a = mmap(addr, len, prot, flags, fd, offset) Map a file in s = unmap(addr, len) Unmap a file Fig. 10-15. Some system calls r...

Ngày tải lên: 28/04/2014, 16:35