lecture1
... the kernel. Some older operating systems had a rendezvous style of providing these services - the process would request a service and wait at a particular point, until a kernel task came along and serviced the request on behalf of the process. UNIX works very differently. Rather than having kernel t ...
... the kernel. Some older operating systems had a rendezvous style of providing these services - the process would request a service and wait at a particular point, until a kernel task came along and serviced the request on behalf of the process. UNIX works very differently. Rather than having kernel t ...
Operating Systems Concepts Resource Abstraction
... copy of everything. – exec system call used after a fork to replace the process’ memory space with a new program. – child and parent compete for CPU like two normal processes. ...
... copy of everything. – exec system call used after a fork to replace the process’ memory space with a new program. – child and parent compete for CPU like two normal processes. ...
Linux Booting Procedure
... Master Boot Record (MBR) contains the primary boot loader The MBR is a 512-byte sector, located in the first sector on the disk (sector 1 of ...
... Master Boot Record (MBR) contains the primary boot loader The MBR is a 512-byte sector, located in the first sector on the disk (sector 1 of ...
1.01 - Kau
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
document
... calendar, OS, etc) are stored in a ROM chip so data remains intact even when the machine shuts down. So when the PDAs are turned ON, all programs are instantly available without having to wait for applications to load. When a file is changed, they’re stored automatically so you don’t need a Save com ...
... calendar, OS, etc) are stored in a ROM chip so data remains intact even when the machine shuts down. So when the PDAs are turned ON, all programs are instantly available without having to wait for applications to load. When a file is changed, they’re stored automatically so you don’t need a Save com ...
DEC 2004 SECTION –A (Marks : 2 Each) Q.1 (a) What is spooling
... The main – program is also loaded into man memory and execute it. If it require any routine any routine or of it is having call to any routine and directly access that Routine form main-memory Dynamic Relocating : To obtain better memory – space utilization, we can use dynamic relocating. In this th ...
... The main – program is also loaded into man memory and execute it. If it require any routine any routine or of it is having call to any routine and directly access that Routine form main-memory Dynamic Relocating : To obtain better memory – space utilization, we can use dynamic relocating. In this th ...
Operating system structures
... Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
... Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
Chapter 1 Operating System Overview
... As a control mechanism is unusual in two respects ٭The OS functions in the same way as ordinary computer software; that is, it is a program executed by the processor. ٭The OS frequently relinquishes control (释放控 制)and must depend on the processor to allow it to regain control（获取控制）. ...
... As a control mechanism is unusual in two respects ٭The OS functions in the same way as ordinary computer software; that is, it is a program executed by the processor. ٭The OS frequently relinquishes control (释放控 制)and must depend on the processor to allow it to regain control（获取控制）. ...
ppt
... programs and data are stored in RAM. A computer has an address bus and a data bus that are used to transfer data from/to the CPU, RAM, ROM, and the devices. The CPU, RAM, ROM, and all devices are attached to this bus. ...
... programs and data are stored in RAM. A computer has an address bus and a data bus that are used to transfer data from/to the CPU, RAM, ROM, and the devices. The CPU, RAM, ROM, and all devices are attached to this bus. ...
slides - Caltech
... • Makes it much easier to identify and isolate bugs, though • Might actually save companies time in the long run, but companies are usually afraid of taking that risk • Layered approach can greatly reduce OS performance • Interactions with the OS often require calls across many layers • Tradeoff: ma ...
... • Makes it much easier to identify and isolate bugs, though • Might actually save companies time in the long run, but companies are usually afraid of taking that risk • Layered approach can greatly reduce OS performance • Interactions with the OS often require calls across many layers • Tradeoff: ma ...
Operating Systems
... System calls are the programmer’s interface to the operating system In modern systems, generally available from a high-level language such as C Examples: fopen(), ioctl() (see MOS Fig 1.18 for more systems calls) Previously: Most of OS was written in assembly and system calls were made from assembly ...
... System calls are the programmer’s interface to the operating system In modern systems, generally available from a high-level language such as C Examples: fopen(), ioctl() (see MOS Fig 1.18 for more systems calls) Previously: Most of OS was written in assembly and system calls were made from assembly ...
7.3. Computer System Structures
... hardware of the computer to indicate the current mode: kernel (0) or user (1). With the mode bit, we can distinguish between a task that is executed on behalf of the operating system and one that is executed on behalf of the user. When the computer system is executing on behalf of a user application ...
... hardware of the computer to indicate the current mode: kernel (0) or user (1). With the mode bit, we can distinguish between a task that is executed on behalf of the operating system and one that is executed on behalf of the user. When the computer system is executing on behalf of a user application ...
int_unix - Pablo Manalastas, PhD
... arguments are separated from each other by one or more white spaces (blanks or tabs). The intention is to have the command work on the supplied arguments. The options or switches modify the standard behaviour of the command. Example: ls -l /var/log/messages ...
... arguments are separated from each other by one or more white spaces (blanks or tabs). The intention is to have the command work on the supplied arguments. The options or switches modify the standard behaviour of the command. Example: ls -l /var/log/messages ...
ch2
... for higher-level and machine language Communications - Provide the mechanism for creating virtual connections among processes, users, and computer systems Allow users to send messages to one another’s screens, ...
... for higher-level and machine language Communications - Provide the mechanism for creating virtual connections among processes, users, and computer systems Allow users to send messages to one another’s screens, ...
Chapter 8 Operating Systems and Utility Programs Chapter 8
... • Floppy disk that contains system files that will start computer when hard disk becomes damaged and computer cannot boot • Also called repair disk, boot disk, or rescue disk ...
... • Floppy disk that contains system files that will start computer when hard disk becomes damaged and computer cannot boot • Also called repair disk, boot disk, or rescue disk ...
Operating system structures
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface ...
... Typically written in a high-level language (C or C++) Mostly accessed by programs via a high-level Application Program Interface ...
2. OS Structures - FSU Computer Science
... Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
Auxilliary Storage Devices
... What is Software? Step-by-step instructions(program) Software controls the hardware Software Package includes: ...
... What is Software? Step-by-step instructions(program) Software controls the hardware Software Package includes: ...
2-Operating-System Structures
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure System Boot ...
... Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure System Boot ...
9. Application/Kernel Interface
... Linux: /usr/include/sys/syscall.h (which includes /usr/include/bits/syscall.h) System call handlers are numbered C library wraps processor-specific parts into a plain function USER MODE ...
... Linux: /usr/include/sys/syscall.h (which includes /usr/include/bits/syscall.h) System call handlers are numbered C library wraps processor-specific parts into a plain function USER MODE ...
Porting a SAS/AF Application from PC to a MAC
... The code executed by the call to the labeled section in the PMENU.SCl is as follows. ...
... The code executed by the call to the labeled section in the PMENU.SCl is as follows. ...
Lecture1
... During past 25 years UNIX OS has evolved into a powerful, flexible and versatile OS. It works on Multi-Platform • PC’s, Micro-computers etc. ...
... During past 25 years UNIX OS has evolved into a powerful, flexible and versatile OS. It works on Multi-Platform • PC’s, Micro-computers etc. ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.