Operating Systems Design and Implementation, Third Edition phần 5 potx

... pages, the operating system can easily regard pages 0 and 1, 2 and 3, 4 and 5, and so on, as 1-KB pages by always allocating two consecutive 51 2-byte page frames for them. Determining the best ... the hand is inspected. If its R bit is 0, the page is evicted, the new page is inserted into the clock in its place, and the hand is advanced one position. If R is 1, it is cleared a...

Ngày tải lên: 12/08/2014, 22:21

... to send? */ 055 41 055 42 sigset_t p_pending; /* bit map for pending kernel signals */ 055 43 055 44 char p_name[P_NAME_LEN]; /* name of the process, including \0 */ 055 45 }; 055 46 055 47 /* Bits for ... value" 0 254 5 #endif 0 254 6 0 254 7 #if (_MINIX_MACHINE == 0) 0 254 8 error "_MINIX_MACHINE has incorrect value (0)" 0 254 9 #endif 0 255 0 0 255 1 #endif /* _MINIX_SYS_CO...

Ngày tải lên: 12/08/2014, 22:21

... 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 and Implementation ... Merge and Split Unregistered Version - http://www.simpopdf.com • Table of Contents &"87%" class="v1" height="17">Index Operating Syste...

Ngày tải lên: 12/08/2014, 22:21

... periods of 100, 200, and 50 0 msec, respectively. If these events require 50 , 30, and 100 msec of CPU time per event, respectively, the system is schedulable because 0 .5 + 0. 15 + 0.2 < 1. If ... its 50 msec quantum would get priority 50 , while a process that ran 25 msec before blocking would get priority 2, and a process that used the whole quantum would get priority 1. [P...

Ngày tải lên: 12/08/2014, 22:21

... the EXTERN macro in proc.h (lines 55 95 and 55 96). The initial queueing of processes during system startup is determined by the image table in table.c (lines 60 95 to 6109). [Page 183] Figure 2-43. ... null pointer and then executing a software interrupt. This has the same effect as a hardware reset. 55 55 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com...

Ngày tải lên: 12/08/2014, 22:21

... replaced with other media, and in the case of floppy disks there are many different possible formats. IBM compatible hardware supports both 3 .5- inch and 5. 25- inch disk drives and the diskettes can ... starting, and the program can also be 25 25 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com Do_transfer (line 12814) does what its name implies, it ass...

Ngày tải lên: 12/08/2014, 22:21

... data processing. 5. 1.3. File Types Many operating systems support several types of files. UNIX and Windows, for example, have regular files and directories. UNIX also has character and block special ... 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,...

Ngày tải lên: 12/08/2014, 22:21

... of the open call and is really only necessary for compatibility with older programs. The procedures that handle creat and open are do_creat (line 2 453 7) and do_open (line 2 455 0). (As in the process ... usage counter and returns a pointer to it. This search is contained on lines 229 45 to 22 955 . If the i-node is not present in memory, the i-node is loaded by calling rw_inode. [P...

Ngày tải lên: 12/08/2014, 22:21

... cons->c_reverse = TRUE; 1 655 0 break; 1 655 1 1 655 2 default: /* COLOR */ 1 655 3 if (n == 39) n = 37; /* set default color */ 1 655 4 if (n == 49) n = 40; 1 655 5 1 655 6 if (!color) { 1 655 7 /* Don't mess ... 2 055 1 /*===========================================================================* 2 055 2 * do_getsysinfo * 2 055 3 *===================================================...

Ngày tải lên: 12/08/2014, 22:21

... advanced parallel, distributed, and imaging systems. In the past, he has done research on compilers, operating systems, networking, and local-area distributed systems. His current research focuses ... in operating systems, networks, and large wide-area distributed systems. Together, all these research projects have led to over 100 refereed papers in journals and conference...

Ngày tải lên: 12/08/2014, 22:21