Operating Systems

Semaphores are devices used to help with synchronization. If multiple processes share a common resource, they need a way to be able to use that resource without disrupting each other. You want each process to be able to read from and write to that resource uninterrupted.

A semaphore will either allow or disallow access to the resource, depending on how it is set up. One example setup would be a semaphore which allowed any number of processes to read from the resource, but only one could ever be in the process of writing to that resource at a time.

BIOS is the basic input/output system ,it is the first program treated when u turned the computer and, it is installed in the ROM

so when you switch on the computer , BIOS comes out the OS from the hard drive and put it in the RAM

A driver typically communicates with the device through the computer bus or communications subsystem to which the hardware connects. When a calling program invokes a routine in the driver, the driver issues commands to the device. Once the device sends data back to the driver, the driver may invoke routines in the original calling program. Drivers are hardware-dependent and operating-system-specific. They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface.

hi please add me on Moshe monsters i am called oddie554433 please please add me

A program reads a large file and gives the report is example of batch processing

No

When a budget is in place and enforced the spending for a company is controlled. There is also a system of checks and balances in place to make sure the money is going where it needs to go.

Yes, when full screen the full screen button is replaced with a down size button (and vise versa)

A hard disk acts as a storage device for data. Data is also retrieved from the hard disk. The data that is kept in the hard disk is not erased even when the computer is switched off.

The creator or developer of sun solaris operating system is the developer of java. The Sun Microsystem. Sun Microsystems, Inc. was a company selling computers, computer components, computer software, and information technology services. Sun was founded on February 24, 1982.

The purpose of a steam trap is discharging noncondensable and condensable gases. They are essentially automatic valves that discharge using a small amount of live steam.

Syntax Phase Scheduler basically check which process should be allocate from the ready queue to the CPU for execution.

A computer system has many resources that may be required to solve a problem: CPU time, memory space, file-storage space, I/O devices, and so on. The operating system acts as the manager of these resources. Facing numerous and possibly conflicting requests for resources, the operating system must decide how to allocate them to specific programs and users so that it can operate the computer system efficiently and fairly.

Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X , is a desktop interface with some 3-D appearance characteristics.

Two-factor authentication uses something a user has in conjunction with something a user knows.

Technically, all modern (and most ancient) computers are capable of running more than one operating system, so there is no distinction.
Almost Any Computer (especially the New Computers)...It really depends on the Hard drive space you have

System software is a program that enables computer to perform a specific task, as opposed to the physical components of the system(which is hardwares).

Systems software consists of three kinds of programs. The system management programs, system support programs, and system development programs

Application software is a sub class of a computer program that employes the capabilities of a computer directly and thoroughly tasks that user wishes. Application software does not deal with hardware.

A disadvantage of a traditional file system is human error. When a file is filed in the wrong place it can be a long time before the file is located. Another disadvantage is the possibility of fire destroying the records. An advantage to this type of filing system is that there is a hard copy of everything that is filed. A file can be copied for several users of the file.

keyboard,mouse,scanner,cpu,printer,hard disk, compact disk, printer, diskette; what relevances do they contribute to political science as a field of study? keyboard,mouse,scanner,cpu,printer,hard disk, compact disk, printer, diskette; what relevances do they contribute to political science as a field of study? keyboard,mouse,scanner,cpu,printer,hard disk, compact disk, printer, diskette; what relevances do they contribute to political science as a field of study?

A host operating system is the operating system that is in direct communication with the hardware. It has direct hardware access to kernel mode and all of the devices on the physical machine. The guest operating system runs on top of a virtualization layer and all of the physical devices are virtualized. A host operating system should be as modular and thin as possible to allow the virtualization of the hardware to be as close to the physical hardware as possible, and so that dependencies that exist in the host operating don't restrict operation in the guest operating system.

The main advantage of the layered approach is modularity. The layered are selected such that each uses function and services of only lower level layers. This approach simplifies debugging and system verification

In this case the system is easier to debug and modify, because changes affect only limited portions of the code, and programmer does not have to know the details of the other layers. Information is also kept only where it is needed and is accessible only in certain ways, so bugs affecting that data are limited to a specific module or layer.

Regards

Praveen Muttikkal

It usually doesn't. You may think of one of the followings:

1. When processing a higher priority interrupt, more interrupts with lower priority are not allowed.

2. During the context-switch (user-mode<->kernel-mode, entering/exiting interrupt/exception handler), interrupts may be disabled.

3. When in a critical operation (eg. manipulating shared data), interrupts may have to be disabled (for a very short time-interval).

It should has the basic instruments set up

3 years

File manager could grant several processes access to the same file if the processes are merely reading data from the file, but conflicts can occur if more than one process tries to alter a file at the same time. Thus, a file manager may allocate file access according to the needs of the processes, allowing several processes to have read access but allowing only one to have write access. Other systems may divide the file into pieces so that different processes can alter different parts of the file concurrently.