Operating Systems Design and Implementation, Third Edition phần 5 potx
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 isevicted, the new page is inserted into the clock in its place, and the hand is advanced one position. If R is 1, itis cleared and the hand ... http://www.simpopdf.com[Page 404]4 .5. Design Issues for Paging Systems In the previous sections we have explained how paging works and have given a few of the basic pagereplacement algorithms and shown how to...
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Operating Systems Design and Implementation, Third Edition phần 8 potx
... to send? */ 055 41 055 42 sigset_t p_pending; /* bit map for pending kernelsignals */ 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_CONFIG_H */ 0 255 2 0 255 3++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++include/minix/const.h++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ... SLOT_FREE) 055 83 #define iskernelp(p)iskerneln((p)->p_nr) 055 84 #define iskerneln(n) ((n) < 0) 055 85 #define isuserp(p) isusern((p)->p_nr) 055 86 #defineisusern(n) ((n) >= 0) 055 87 055 88...
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Operating Systems Design and Implementation, Third Edition phần 1 doc
... PDF Merge and Split Unregistered Version - http://www.simpopdf.comCopyright[Page iv]Library of Congress Cataloging in Publication DataTanenbaum, Andrew S. Operating Systems: Design and Implementation ... Merge and Split Unregistered Version - http://www.simpopdf.com• Table ofContents&"87%" class="v1"height="17">Index Operating Systems Design and Implementation, ... JerseyDedicationTo Suzanne, Barbara, Marvin, and the memory of Sweetie π and BramASTTo Barbara and GordonASWThe MINIX 3 MascotOther operating systems have an animal mascot, so we felt MINIX...
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Operating Systems Design and Implementation, Third Edition phần 2 pptx
... periods of 100, 200, and 50 0msec, respectively. If these events require 50 , 30, and 100 msec of CPU time per event, respectively, thesystem is schedulable because 0 .5 + 0. 15 + 0.2 < 1. If ... its 50 msec quantum would getpriority 50 , while a process that ran 25 msec before blocking would get priority 2, and a process that used thewhole quantum would get priority 1.[Page 1 05] It ... terms task and device driver is needed. In older versions of MINIX all33Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.compaper.[Page 93] 5 5Simpo PDF Merge and Split...
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Operating Systems Design and Implementation, Third Edition phần 3 pptx
... theEXTERN macro in proc.h (lines 55 95 and 55 96). The initial queueing of processes during system startup isdetermined by the image table in table.c (lines 60 95 to 6109).[Page 183]Figure 2-43. ... nullpointer 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.com1212Simpo PDF Merge and ... elements of irq_handlers. Put_irq_handler adds an entry to one of these lists. 51 51 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.cominstance, the user command ps needs to...
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Operating Systems Design and Implementation, Third Edition phần 4 docx
... replaced with other media, and in the case of floppy disks there are many differentpossible formats. IBM compatible hardware supports both 3 .5- inch and 5. 25- inch disk drives and the diskettescan ... starting, and the program can also be 25 25 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.comDo_transfer (line 12814) does what its name implies, it assembles a command structure ... maximumcylinder, head, and sector numbers can be 1023, 255 , and 63 respectively, due to the number of bits allowedfor these fields in the original BIOS data structures.If the ATA_IDENTIFY command fails,...
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Operating Systems Design and Implementation, Third Edition phần 6 ppsx
... data processing. 5. 1.3. File TypesMany 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, 1, 1, 0, 0, 0,1, and ... structure of the file attributes, and one or moredisk addresses (up to some maximum) telling where the disk blocks are, as we saw in Fig. 5- 5(a).[Page 50 4]For systems that use i-nodes, another...
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Operating Systems Design and Implementation, Third Edition phần 7 pps
... of the open call and is really only necessary for compatibility witholder programs. The procedures that handle creat and open are do_creat (line 2 453 7) and do_open (line2 455 0). (As in the process ... usage counter and returns a pointer to it. This search is contained on lines229 45 to 22 955 . If the i-node is not present in memory, the i-node is loaded by calling rw_inode.[Page 57 5]When the ... satisfy it. Figure 5- 45 shows three examplesof how the chunk size is determined, for chunk sizes of 6, 2, and 1 bytes, respectively. The actual calculationis done on lines 251 59 to 251 69.1919Simpo...
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Operating Systems Design and Implementation, Third Edition phần 9 doc
... 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*===========================================================================*/ 2 055 4PUBLIC int do_getsysinfo() 2 055 5 { 2 055 6 struct mproc *proc_addr; 2 055 7 vir_bytes ... DEL_SCAN:sys_abort(RBT_HALT); return; 158 50 } 158 51 (void) func_key(code); /* check for function key */ 158 52 quiet =scan_keyboard(); 158 53 } 158 54 } 158 55 }++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++drivers/tty/console.c++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++...
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Operating Systems Design and Implementation, Third Edition phần 10 pdf
... 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 100refereed papers in journals and conference proceedings and ... 28 255 major = FLOPPY_MAJOR;28 256 } 28 257 else if (controller[0] == 'c' && isdigit(controller[1])) { 28 258 if ((nr = (unsigned) atoi(&controller[1]))> NR_CTRLRS) 28 259 ...
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