Operating Systems Design and Implementation, Third Edition phần 8 potx

... 0 788 3 else penalty ; /* give slow way back */ 0 788 4 prev_ptr = rp; /* store ptr for next */ 0 788 5 } 0 788 6 0 788 7 /* Determine the new priority of this process. The bounds are determined 0 788 8 ... */ 0 482 6 #define _SRC_ 0 0 482 7 #define _DST_ 1 0 482 8 0 482 9 /* Number of random sources */ 0 483 0 #define RANDOM_SOURCES 16 0 483 1 0 483 2 /* Constants and macros for bit map ma...

Ngày tải lên: 12/08/2014, 22:21

... chosen by the operating system. Even if the hardware has been designed with, for example, 512-byte pages, the operating system can easily regard pages 0 and 1, 2 and 3, 4 and 5, and so on, as ... and deserves some explanation. It was originally derived from three factors: 1. The desire to keep the system easy to understand. 2. The architecture of the original IBM PC CPU (an Inte...

Ngày tải lên: 12/08/2014, 22:21

... 0-13-1429 38- 8 Print ISBN-13 : 9 78- 0-13-1429 38- 3 eText ISBN-10 : 0-13- 185 991-9 eText ISBN-13 : 9 78- 0-13- 185 991-3 Pages: 1 080 Copyright Preface Chapter 1. Introduction Section 1.1. What Is an Operating System? Section 1.2. ... Merge and Split Unregistered Version - http://www.simpopdf.com • Table of Contents &" ;87 %" class="v1" height="17"&...

Ngày tải lên: 12/08/2014, 22:21

... quantum. [View full size image] 8 8 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com [Page 88 (continued)] 2.3. Classical IPC Problems The operating systems literature is full ... interactive systems, especially timesharing systems and servers, different goals apply. The most important one is to minimize response time, that is the time between issuing a c...

Ngày tải lên: 12/08/2014, 22:21

... (lines 83 83 to 84 18) , is initialized by the compiler with the addresses of the routines that handle exceptions and hardware interrupts and then is used in the loop at lines 84 64 to 84 68 to initialize ... of possible sources and destinations, and the call may require either sending or receiving or both sending and receiving a message. A number of tests must be made. On line...

Ngày tải lên: 12/08/2014, 22:21

... on and for newer systems with Pentium-class CPUs, but even among these there are differences. For instance, the oldest Pentium systems use the 16-bit AT bus originally designed for the 80 286 ... the BIOS. [Page 288 ] 8 8 Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com Disk Arm Scheduling Algorithms If the disk driver accepts requests one at a time and ca...

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 ... historical note, when the 80 -column punched card was king many (mainframe) operating systems based their file systems on files consisting of 80 -character records, in effect, ca...

Ngày tải lên: 12/08/2014, 22:21

... (lines 2 481 9 and 2 482 0). Once this test has been passed, new_node is called. If new_node succeeds, then the directory entries for "." and " " are made (lines 2 484 1 and 2 484 2). ... which understands about i-nodes and indirect blocks. For an ordinary file, the variables b and dev on line 25 280 and line 25 281 contain the physical block number and devic...

Ngày tải lên: 12/08/2014, 22:21

... kill the process. 1 988 0 */ 1 988 1 1 988 2 vir_bytes new_sp; 1 988 3 int s; 1 988 4 int slot; 1 988 5 int sigflags; 1 988 6 struct sigmsg sm; 1 988 7 1 988 8 slot = (int) (rmp - mproc); 1 988 9 if ((rmp->mp_flags ... getpgrp */ 1 788 0 1 788 1 no_sys, /* 64 = unused */ 1 788 2 no_sys, /* 65 = UNPAUSE */ 1 788 3 no_sys, /* 66 = unused */ 1 788 4 no_sys, /* 67 = REVIVE */ 1 788 5 no_sys, /...

Ngày tải lên: 12/08/2014, 22:21

... 283 85 case DEV_REVIVE: 283 86 revive(st.REP_PROC_NR, st.REP_STATUS); 283 87 break; 283 88 case DEV_IO_READY: 283 89 select_notified(d, st.DEV_MINOR, st.DEV_SEL_OPS); 283 90 break; 283 91 default: 283 92 ... 283 70 283 71 for(d = 0; d < NR_DEVICES; d++) 283 72 if (dmap[d].dmap_driver == m->m_source) 283 73 break; 283 74 283 75 if (d >= NR_DEVICES) 283 76 return; 283 77 283 78 do {...

Ngày tải lên: 12/08/2014, 22:21