Operating Systems Design and Implementation, Third Edition phần 4 docx

... key, 2 forthe "1'', and so on. Each key is assigned a number, including modifier keys like the left SHIFT and rightSHIFT keys, numbers 42 and 54. When a key is pressed, MINIX 3 ... w_timeout line 13 046 is called. Whatneeds to be done depends on the current command in w_command. The timeout might have been left overfrom a previous operation, and w_command may have the value ... keyboard.c, and console.c, all of which are large files,When a user logs in on the system console, a shell is created for him with /dev/console as standard input,standard output, and standard error....

Operating Systems Design and Implementation, Third Edition phần 1 doc

... class="v1"height="17">Index Operating Systems Design and Implementation, Third Edition By Andrew S. Tanenbaum - Vrije Universiteit Amsterdam, TheNetherlands, Albert S. Woodhull - Amherst, ... BasicMemoryManagementSection 4. 2. SwappingSection 4. 3. VirtualMemorySection 4. 4. PageReplacementAlgorithmsSection 4. 5. Design IssuesforPaging Systems Section 4. 6. SegmentationSection 4. 7. OverviewoftheMINIX3ProcessManagerSection 4. 8. ... access"times = times(buffer) Get the user and systemtimes used sofar 4 4Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com 4 4Simpo PDF Merge and Split Unregistered Version -...

Operating Systems Design and Implementation, Third Edition phần 2 pptx

... kernel starts the system and clock tasks, and then theprocess manager and the file system. The process manager and the file system thencooperate in starting other servers and drivers that are part ... interactive systems, especially timesharing systems and servers, different goals apply. The most importantone is to minimize response time, that is the time between issuing a command and getting ... used in batch systems. In the following ones we will examine interactive and real-time systems. It is worth pointing out that some algorithms are used in both batch and interactive systems. We...

Operating Systems Design and Implementation, Third Edition phần 3 pptx

... (lines 8383 to 841 8), is initialized by the compiler with the addresses ofthe routines that handle exceptions and hardware interrupts and then is used in the loop at lines 846 4 to 846 8to initialize ... Cprograms and the rather ugly forms these data take in the machine readable descriptors such as the one in Fig.2 -44 . Init_codeseg (line 847 7) and init_dataseg (line 849 3) are similar in operation and ... segment to befurther divided into data and stack segments. On lines 844 4 to 845 0 descriptors for each LDT are built in theGDT. The functions init_dataseg and init_codeseg build these descriptors....

Operating Systems Design and Implementation, Third Edition phần 5 potx

... http://www.simpopdf.com[Page 40 4] 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 ... formof a clock, as shown in Fig. 4- 15. A hand points to the oldest page.Figure 4- 15. The clock page replacement algorithm.[View full size image] 4 4Simpo PDF Merge and Split Unregistered Version ... protection bits, and otherutility bits.Each page table has entries for 10 24 4-KB page frames, so a single page table handles 4 megabytes ofmemory. A segment shorter than 4- MB will have a page...

Operating Systems Design and Implementation, Third Edition phần 6 ppsx

... drivers and servers of MINIX 3 need support forcommunication with the kernel that is not necessary in monolithic operating systems. Fig. 4- 52 shows thesecalls and their purposes.[Page 47 2]Figure ... 47 1] 4. 8.7. Implementation of Other System CallsThe process manager handles three system calls that involve time in time.c: time, stime, and times. Theyare summarized in Fig. 4- 50.Figure 4- 50. ... likechmem?33. Figure 4- 44 shows the initial memory usage of the first four components of a MINIX 3 system.What will be the cs value for the next component loaded after rs?[Page 48 0] 34. IBM-compatible...

Operating Systems Design and Implementation, Third Edition phần 7 pps

... (lines 248 19 and 248 20).Once this test has been passed, new_node is called. If new_node succeeds, then the directory entries for "." and " " are made (lines 248 41 and 248 42). ... uses of the open call and is really only necessary for compatibility witholder programs. The procedures that handle creat and open are do_creat (line 245 37) and do_open (line 245 50). (As in the ... be on the LRU chain, and all will be linked into the 0th hash chain, as in Fig. 5 -44 (a). When abuffer is requested, and while it is in use, we have the situation of Fig. 5 -44 (b), in which we see...

Operating Systems Design and Implementation, Third Edition phần 8 potx

... r_buf[RANDOM_ELEMENTS]; /* bufferfor random info */ 049 42 } bin[RANDOM_SOURCES]; 049 43 }; 049 44 049 45 #if (CHIP == INTEL) 049 46 typedefunsigned reg_t; /* machine register */ 049 47 049 48 /* The stack frame layout ... 0 640 0 .define _hwint09 0 640 1 .define _hwint100 640 2 .define _hwint11 0 640 3 .define _hwint12 0 640 4 .define _hwint13 0 640 5 .define _hwint 14 0 640 6 .define_hwint15 0 640 7 0 640 8 .define _s_call 0 640 9 ... CHUNK_OFFSET(bit) ) [Page 692] 048 40 048 41 #define get_sys_bit(map,bit) \ 048 42 ( MAP_CHUNK(map.chunk,bit) & (1 << CHUNK_OFFSET(bit) ) 048 43 #define set_sys_bit(map,bit) \ 048 44 ( MAP_CHUNK(map.chunk,bit)...

Operating Systems Design and Implementation, Third Edition phần 9 doc

... (OPOST|XTABS)) 148 40 == (OPOST|XTABS)) { 148 41 /* Tabs must be expanded. */ 148 42 if (oct >= tablen) { 148 43 pos += tablen; 148 44 ict ; 148 45 oct -= tablen; 148 46 do { 148 47 *bpos = ' '; 148 48if ... >> IN_LSHIFT; 147 37 while (len > 0) { 147 38 rawecho(tp, '\b'); 147 39 rawecho(tp, ' '); 147 40rawecho(tp, '\b'); 147 41 len ; 147 42 } 147 43 } 147 44 return(1); /* ... line to cursor */1 644 1 count = cons->c_column; 1 644 2 dst = cons->c_cur - cons->c_column; 1 644 3 break; 1 644 4 case 2: /* Clearentire line */ 1 644 5 count = scr_width; 1 644 6 dst = cons->c_cur...

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 ... r; 28 340 struct dmap *dp; 28 341 28 342 /*Determine the major device number call the device class specific 28 343 * open/close routine. (This is the only routinethat must check the 28 344 * device...

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