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Linux vs HP-UNIX - Essay Example

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UNIX as an operating system is uniquely exceptional through its file system and the ability to coordinate the naming of resources as well as accessing the same resources. An idea was therefore adopted to "design a network-level protocol, called 9P, to enable machines to access files on remote systems." (Pike et al) Bell Labs As UNIX worked toward being a reputable file system and operating system, but, as this type of file system and operating system becomes redundant another more powerful user friendly operating system called Linux.
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Download file to see previous pages "A single class of process is a feasible approach in Plan 9 because the kernel has an efficient system call interface and cheap process creation and scheduling." (Pike et al) Bell Labs:
The kernel support for parallel programming in Plan 9 is a few hundred lines of portable code; a handful of simple primitives enable the problems to be handled cleanly at user level. Although the primitives work fine from C, they are particularly expressive from within Alef. The creation and management of slave I/O processes can be written in a few lines of Alef, providing the foundation for a consistent means of multiplexing data flows between arbitrary processes. (Pike et al) Bell Labs
UNIX is a "multi-tasking OS, which means that there may be many programs and many programs and people using the same machine at the same time, by using the concept of a virtual machine". (Seth Noble, 2005)
Linux's bottom half handlers were invented so that device drivers and other parts of the Linux kernel could queue work to be done later on. Figure 11.1 shows the kernel data structures associated with bottom half handling.
Bottom Half Handling
Figure 11.1: Bottom Half Handling Data Structures
There can be up to 32 different bottom half handlers; bh_base is a vector of pointers to each of the kernel's bottom half handling routines. bh_active and bh_mask have their bits set according to what handlers have been installed and are active. If bit N of bh_mask is set then the Nth element of bh_base contains the address of a bottom half routine. If bit N of bh_active is set then the N'th bottom half handler routine should be called as soon as the scheduler deems reasonable. These indices are statically defined; the timer bottom half handler is the highest priority (index 0), the console bottom half handler is next in priority (index 1) and so on. Typically the bottom half handling routines have lists of tasks associated with them. For example, the immediate bottom half handler works its way through the immediate tasks queue (tq_immediate) which contains tasks that need to be performed immediately. (Rusling, David 1999)
Shell
The shell application inside the UNIX Plan9 system are set up for standard input and output connection to the editable text of the window with such features as its own private bitmap and multiplexed access to the keyboard, mouse and other graphical resources.
The UNIX shell is commonly defined as the command line which provides the user interface for the actual operating system. By executing input commands, the shell will then execute those exact inputs.
There are different shells that are available for Linux and is very much the same as UNIX in its description of how the shell application works. The following shells are available for Linux:
Shell Name
Developed by
Where
Remark
BASH ( Bourne-Again SHell )
Brian Fox and Chet Ramey
Free Software Foundation
Most common shell in Linux. ...Download file to see next pagesRead More
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