Shahriar Prince

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March 25, 2011

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Similarities between Process and Threads

Both have a parent process. Process has a process id same way thread has a thread id. We can create a process within a process same way we can create thread within a thread Both process and thread has priorities. Unlike processes, threads are not independent of one another. Unlike processes, all threads can access every address in the task . Unlike processes, thread are design to assist one other. Note that processes might or might not assist one another because processes may originate from different users. Thread is a light weight process that is the only comparision. Otherwise you cannot compare both. A thread is contained inside a process. Multiple threads can exist within the same process and share resources such as memory, while different processes do not share these resources. A Process is an instance of a computer program, consisting of one or more threads. Each process must have at least one thread running within it, and each thread must be running within a process...

Operating System as Resource Manager

WHAT IS OPERATING SYSTEM ? • Operating System is a software, which makes a computer to actually work. • • It is the software that enables all the programs we use. • • The OS organizes and controls the hardware. • • OS acts as an interface between the application programs and the machine hardware. • • Examples: Windows, Linux, Unix and Mac OS, etc. Why Resource Manager ? * When a computer has multiple users, the need for managing and protecting the memory, I/O devices and other devices is even greater. * The primary task of OS is to keep track of who is using which resource, to grant resource requests, to mediate conflicting requests from different programs etc . * Users often need to share not only hardware, but information(File, Database) as well. Which Includes in Resource Manager ? Resource management includes multiplexing resources in 2 ways, they are 1. In Time 2. In Space When Resource is Time Multiplexed * “Who goes ne...

Quantum Gates

Some Quantum Gates FREDKIN GATE The Fredkin gate (also CSWAP gate ) is a computational circuit suitable for reversible computing , invented by Ed Fredkin . It is universal , which means that any logical or arithmetic operation can be constructed entirely of Fredkin gates. The Fredkin gate is the three-bit gate that swaps the last two bits if the first bit is 1. The basic Fredkin gate is a controlled swap gate that maps three inputs ( C , I 1 , I 2 ) onto three outputs ( C , O 1 , O 2 ). The C input is mapped directly to the C output. If C = 0, no swap is performed; I 1 maps to O 1 , and I 2 maps to O 2 . Otherwise, the two outputs are swapped so that I 1 maps to O 2 , and I 2 maps to O 1 . It is easy to see that this circuit is reversible, i.e., "undoe...

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