A computer system consists of hardware, system programs, and application programs figs 9
A computer system consists of hardware, system programs, and application programs figs 1
... 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
A computer system consists of hardware, system programs, and application programs figs 2
... 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
A computer system consists of hardware, system programs, and application programs figs 3
... A B C 3 2 2 9 4 7 Free: 3 (a) A B C 3 4 2 9 4 7 Free: 1 (b) A B C 3 0 –– 2 9 7 Free: 5 (c) A B C 3 0 7 9 7 Free: 0 (d) – A B C 3 0 0 9 – Free: 7 (e) Has Max Has Max Has Max Has Max Has Max Fig. ... 3 -9. 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 F...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 4
... 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 frames assigned. Single address space 2 32 0 Data Program (a) I ... virtual page 0 Indexed by hash on virtual page Virtual page Page frame Fig. 4-15. Comparison of a traditional page table with an inverted page table. (a) Page loaded fi...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 5
... and laser (not to scale). A silver CD-ROM has a similar structure, except without the dye layer and with a pitted aluminum layer instead of a gold layer. Polycarbonate substrate 1 Polycarbonate ... data bytes Symbols of 14 bits each 42 Symbols make 1 frame 98 Frames make 1 sector … … Fig. 5-21. Logical data layout on a CD-ROM. Printed label Protective lacquer Reflective gol...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 6
... utilization Data rate Block size (bytes) Fig. 6-20. The solid curve (left-hand scale) gives the data rate of a disk. The dashed curve (right-hand scale) gives the disk space efficiency. All files are ... 4 Address of disk block 5 Address of disk block 6 Address of disk block 7 Address of block of pointers Disk block containing additional disk addresses Fig. 6-15. An example i-no...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 7
... 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 ... (b) After a rewind to 12 min. (c) After waiting 3 min. (d) After starting to refill the buffer. (e) Buffer full. Video A A A T T Video A A A T T Video A A A T...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 8
... CPU systems. Pentium Windows Middleware Middleware Middleware Middleware Application Pentium Linux Application SPARC Solaris Application Mac OS Application Macintosh Common base for applications Network Fig. ... memory Application Hardware Run-time system Operating system Application Hardware (b) Machine 1 Machine 2 Run-time system Operating system Shared memory Applicati...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 9
... capability. Goal Threat Data confidentiality Exposure of data Data integrity Tampering with data System availability Denial of service Fig. 9- 1. Security goals and threats. User process All system calls ... (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...
Ngày tải lên: 28/04/2014, 16:35
A computer system consists of hardware, system programs, and application programs figs 10
... 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