Multithreading
Question: What is Thread and Process?
Ans-- Java support multithreaded programming. A multithreaded program
contains two or more parts that can run concurrently. Multithreading
is a specialized form of multitasking. There are two types of multitasking:
Thread-based and Process-based .
Thread-based:
A thread is a program which defines a separate path of execution,
the thread is the smallest unit of dispatchable code. This means that
a single program can perform two or more tasks
simultaneously.
Process-based :
A process is a program that is executing.
Thus, process-based multitasking is the feature that allows your computer to run
two or more programs concurrently.
Question: What Multithreading?
Ans-- All modern operating systems
support multitasking by virtually . Java also support multithreaded programming.
A multithreaded program contains two or more parts that can run concurrently, while
Java programs
use the process-based multitasking environments. Multithreading is a
specialized form of multitasking.
There are two types of multitasking: Thread-based and
Process-based .
Thread-based:
A thread is a program which defines a separate path of execution,
the thread is the smallest unit of dispatchable code. This means that a
single program can perform two or more tasks
simultaneously. Multitasking
threads require less overhead than multitasking processes,
Threads are lightweight, they share the same address space and cooperatively share the same heavyweight
process while
Interthread communication is inexpensive and unlimited.
Process-based :
A process is a program that is executing.
Thus, process-based multitasking is the feature that allows your
computer to run two or more program concurrently. Processes are
heavyweight
tasks that require their own separate address spaces while Intercrosses communication is expensive and limited.
Question: What is Thread Priorities?
Ans-- Java assigns a priority
level to each thread that determines how that thread should be treated with
respect to the others. Thread priorities are integers that specify the relative priority of one thread to another.
A thread’s
priority is used to decide when to switch from one running thread to the next.
This is called a context switch. A higher priority thread is running first than lower priority
thread.
The rules which determine the context switch takes place are
simple:
1. A thread can voluntarily relinquish control.
This is done by explicitly yielding, sleeping, or blocking on pending I/O. In
which all other threads are examined, and the highest priority thread that is ready to
run is given to
CPU for processing.
2. A thread can be preempted by a higher-priority
thread. A lower-priority thread that does not yield the processor is
simply preempted no matter what it is doing by a higher-priority thread. Basically, as
soon as a
higher-priority thread wants to run, it does. This is called preemptive
multitasking.
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