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Load Sharing: Processes are not assigned to a particular processor. A global queue of threads is maintained. Each processor, when idle, selects a thread from this queue.
Gang Scheduling: A set of related threads is scheduled to run on a set of processors at the same time, on a 1-to-1 basis. Closely related threads / processes may be scheduled this way to reduce synchronization blocking, and minimize process switching. Group scheduling predated this strategy.
Dedicated processor assignment: Provides implicit scheduling defined by assignment of threads to processors. For the duration of program execution, each program is allocated a set of processors equal in number to the number of threads in the program. Processors are chosen from the available pool.
Dynamic scheduling: The number of thread in a program can be altered during the course of execution.
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What are user level threads?
•No special support needed from the kernel (use any Unix) •Thread creation and context switch are fast (no syscall) •Defines its own thread model and scheduling policies
What is thread in operating system?
A thread is in fact just that, a thread. Something simple. A simple chain of computing that is set up as in 'a row'. A chain of commands that can be useful to the programmers needs. Sometimes the programmers can actually control the flow of events that take place, but most commonly that is up to the programming language to do it for him. Most useful is the 'multichannel' programming threads, that are distributed along different paths to be gathered up in the end. Each thread can then be processed independently of each other in a multiprocessor environment. Therefore these 'threads' can be assembled (sometimes) and put forrward to the user at a higher speed tha otherwise possible.
The system allows developers to use real time threadsIs it necessary to bind a real time thread to an LWP?
Yes. Timing is crucial to real-time applications. If a thread is marked as real-time but is not bound to an LWP, the thread may have to wait to be attached to an LWP before running. Consider if a real-time thread is running (is attached to an LWP) and then proceeds to block (i.e. must perform I/O, has been preempted by a higher-priority real-time thread, is waiting for a mutual exclusion lock, etc.) While the real-time thread is blocked, the LWP itwas attached to has been assigned to another thread. When the real-time thread has been scheduled to run again, it must first wait to be attached to an LWP.Bybindingan LWP to a real- time thread you are ensuring the threadwill be able to runwithminimal delay once it is scheduled.
Who are the characters of the spiders thread?
lord bhudda shakyamuni
What is multi thread operating system?
Basically a thread means a process which CPU is executing at particular time, if you want to run many processes (applications) in the same time, you need to have multithread OS.
