Operating Systems Design and Implementation, Third Edition phần 2 pptx

... manager and the file system will be found in any operating system. The information server (IS) handles 2 2 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com 12 12 Simpo ... might lead to the sequence A1, A2, A3, A1, A2, A3, A1, A2, A3, A1, before the kernel switches to process B. This situation is illustrated in Fig. 2- 28(a). Figure 2- 28. (a) Possible sch...

Ngày tải lên: 12/08/2014, 22:21

... more layers and the priority of a process may change during its execution. The clock and system tasks in layer 1 of Fig. 2- 29 receive the highest priority. The device drivers of layer 2 get lower ... particular moment. Fig. 2- 43 shows the queues and the processes that are in place at the instant the kernel completes initialization and begins to run, that is, at the call to resta...

Ngày tải lên: 12/08/2014, 22:21

... 2 2 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com Copyright [Page iv] Library of Congress Cataloging in Publication Data Tanenbaum, Andrew S. Operating Systems: Design ... Systems: Design and Implementation / Andrew S. Tanenbaum, Albert S. Woodhull. 3rd ed. ISBN: 0-13-1 429 38-8 1. Operating systems (Computers) I. Woodhull, Albert S. II. Title Q...

Ngày tải lên: 12/08/2014, 22:21

... using powers of 2a Kilobyte (KB) is 2 10 = 1 024 bytes, a Megabyte (MB) is 2 20 = 1 024 2 bytes, etc., to express the size of memory devices. A Gigabyte (GB), then, should be 1 024 3 , or 2 30 bytes. However, ... with 32, 768 bytes of display memory can hold 20 4 complete lines of 160 bytes each, and can do hardware scrolling 179 times before the inability to wrap becomes a 22...

Ngày tải lên: 12/08/2014, 22:21

... REG ,24 576 because virtual address 81 92 is in virtual page 2 and this page is mapped onto physical page frame 6 (physical addresses 24 576 to 28 671). As a third example, virtual address 20 500 is 20 ... chosen by the operating system. Even if the hardware has been designed with, for example, 5 12- byte pages, the operating system can easily regard pages 0 and 1, 2 and...

Ngày tải lên: 12/08/2014, 22:21

... D, and F in that order. Their respective load times were 18, 23 , 5, 7, 32, 19, 3, and 8. Their reference bits are 1, 0, 1, 1, 0, 1, 1, and 0 and their modified bits are 1, 1, 1, 0, 0, 0, 1, and ... time. Call Function time Get current real time and uptime in seconds stime Set the real time clock 25 25 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com...

Ngày tải lên: 12/08/2014, 22:21

... 27 217 and 27 218). 4. Both parent directories must be on the same device (line 27 221 ). 5. Both parent directories must be writable, searchable, and on a writable device (lines 27 224 and 27 225 ). 6. ... (line 27 177). 2. The old pathname must not be a directory above the new pathname in the directory tree (lines 27 195 to 27 2 12) . 3. Neither . nor is acceptable as an old...

Ngày tải lên: 12/08/2014, 22:21

... */ 025 17 #if __ACK__ || __GNUC__ 025 18 #define _WORD_SIZE _EM_WSIZE 025 19 #define _PTR_SIZE _EM_WSIZE 025 20 #endif 025 21 025 22 #define _NR_PROCS 64 025 23 #define _NR_SYS_PROCS 32 025 24 025 25 /* ... addresses and lengths in bytes */ 028 18 #endif 028 19 028 20 #if (_MINIX_CHIP == _CHIP_M68000) 028 21 typedef unsigned long vir_bytes;/* virtual addresses and lengths in bytes */ 0...

Ngày tải lên: 12/08/2014, 22:21

... timers and run watchdog functions 20 211 * pm_cancel_timer: remove a time from the list of timers 20 2 12 * 20 213 */ 20 214 20 215 #include "pm.h" 20 216 20 217 #include <timers.h> 20 218 ... <minix/syslib.h> 20 219 #include <minix/com.h> 20 220 20 221 PRIVATE timer_t *pm_timers = NULL; 20 222 20 223 /*=============================================...

Ngày tải lên: 12/08/2014, 22:21

... 28 260 major = CTRLR(nr); 28 261 } 28 2 62 else { 28 263 panic(__FILE__,"monitor 'controller' syntax is 'c#' of 'fd'", NO_NUM); 28 264 } [Page 1 022 ] 28 265 28 266 ... #include <minix/com.h> 28 322 #include "file.h" 28 323 #include "fproc.h" 28 324 #include "inode.h" 28 325 #include "param.h"...

Ngày tải lên: 12/08/2014, 22:21