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Operating Systems
One kind of software that controls the overall operation of a computer
Unix, Sun Solaris
Linux: Ubuntu, Redhat, ...
Microsoft Windows
Apple Mac OS X
Google Chrome OS
One of the biggest questions that popped up when Google announced the OS was how it intended to handle?
Fast & light weight : The new Chrome OS is expected to work well with many of the company's popular software applications. It will be fast and less memory-intensive, enabling users to access the Web in a few seconds.
The new system is designed to work with ARM and x86 chips, the main chip architectures in use in the market. Microsoft has previously said it would not support PCs running on ARM chips, allowing Google an opportunity to infiltrate that segment.
Features
Speedy boot up, as fast as three seconds: A Chrome OS device will not store any applications on the device itself. The only applications it will use are those that can be run from the cloud in a browser, the Chrome browser, to be specific. One of the primary reasons for this is to speed up boot time. With no local applications and limited hardware, the device doesn't need to run through long checklist looking for devices and drivers, loading programs into resident memory and so on. It should turn on like a television, flip a switch and the within three seconds browser should be available, showing the most recent browser windows.
Security by default: The portion of the operating system needed to operate the device will reside in a read only section of memory. The rest of the operating system is integrated with the Chrome browser and, like the browser, security updates require nothing more than a reboot. Chrome OS can run multiple web applications in multiple tabs and each one is locked down from all others, so one web app can't lead to exposure in another. User data stored on the device, which is minimal, is encrypted. User data is limited to items such as user preferences. All other data will be stored in the cloud.
Google Vs Microsoft
Google Attacks on Microsoft
Google plans to attack Microsoft's core business by taking on the software giant's globally dominant Windows operating system for personal computers.
Google Chrome Operating System, the new software will be in netbooks in the second half of 2010.
Microsoft OS Share on PC~90% PCs using Microsoft’s OS Google is planning to capture Microsoft Share of 90%
A surprising way to support Microsoft Offic
Chrome OS would handle Office documents via Microsoft Office Live, the free web app version of Office available to Windows Live users. If a user clicks on an .xls document, Chrome launches Excel via the browser in Office Live.
Google Chrome OS Cost
Support for both x86 and ARM architectures:
Google promises that it will be writing native code for both popular net book CPUs.
The application menu
As new web applications come online tweaked for Chrome OS, Chrome OS will showcase them on a permanent tab it now calls the application menu. This will help users find new applications. Developers with new apps will find this an easier method to showcase them, too. Any web application that runs in a standards compliant browser should work on a Chrome OS device. But Chrome OS is focused on supporting new protocols such as HTML 5, which, among other improvements, natively supports rich media.
All the Chromes Compared-Operating Systems-
Google Chrome OS
Batch Processing
Interactive Processing
Time-sharing/Multitasking
Time-sharing between process A and process B
Context (Process State)
Snapshot of current status of a process
A process identifier, or PID
Register values, Program Counter value
The memory space, I/O, files for the process
Can be saved and resumed as if the process is not interrupted
Another meaning: execution state of the process
Ready: ready for execution
Waiting: waiting for some I/O
Complete: finished process
Scheduler
Determines which processes should be considered for execution based on some priorities or concerns
Using process table for administration
Process table
Ready or waiting
Priority
Non-scheduling information: memory pages, etc.
Context Switch (process switch)
Get an interrupt from timer
Go to the interrupt handler
Save the context of process A
Find a process ready to run(Assume that is process B)
Load the context of process B
Start (continue) process B
Conditions for Deadlock
Competition for non-sharable resources
Resources requested on a partial basis
Allocated resources cannot be forcibly retrieved
Circular wait