Any kind of sequential program is not a good candidate to be threaded. An example
of this is a program that calculates an individual tax return. (2) Another example is a
"shell" program such as the C-shell or Korn shell. Such a program must closely
monitor its own working space such as open files, environment variables, and
current working directory.
Threading is a facility to allow multiple activities to coexist within a single process. Most modern operating systems support threads, and the concept of threads has been around in various forms for many years. Java is the first mainstream programming language to explicitly include threading within the language itself, rather than treating threading as a facility of the underlying operating system.
Threads are sometimes referred to as light weight processes. Like processes, threads are independent, concurrent paths of execution through a program, and each thread has its own stack, its own program counter, and its own local variables. However, threads within a process are less insulated from each other than separate processes are. They share memory, file handles, and other per-process
state.
A process can support multiple threads, which appear to execute simultaneously and asynchronously to each other. Multiple threads within a process share the same memory address space, which means they have access to the same variables and objects, and they allocate objects from the same heap. While this makes it easy for threads to share information with each other, you must take care to ensure that they do not interfere with other
threads in the same process.
The following example uses two threads, one for timing and one to do actual work. The main thread calculates prime numbers using a very straightforward algorithm. Before it starts, it creates and starts a timer thread, which will sleep for ten seconds, and then set a flag that the main thread will check. After ten seconds, the main thread will stop. Note that the shared flag is declared "volatile".
.
/**
* CalculatePrimes -- calculate as many primes as we can in ten seconds
*/
public class CalculatePrimes extends Thread {
public static final int MAX_PRIMES = 1000000;
public static final int TEN_SECONDS = 10000;
public volatile boolean finished = false;
public void run() {
int[] primes = new int[MAX_PRIMES];
int count = 0;
for (int i=2; count // Check to see if the timer has expired if (finished) { break; } boolean prime = true; for (int j=0; j if (i % primes[j] == 0) { prime = false; break; } } if (prime) { primes[count++] = i; System.out.println("Found prime: " + i); } } } public static void main(String[] args) { CalculatePrimes calculator = new CalculatePrimes(); calculator.start(); try { Thread.sleep(TEN_SECONDS); catch (InterruptedException e) { // fall through } calculator.finished = true;
}
}
}
A typical example would be to copy 2 big files, say 3 minutes each if doing back to back. (total of 6 minutes minimum)
By using 2 threads, those 2 files maybe copied in 3 minutes (plus a little bit overhead, in theory, just a fraction of a second)
(replace "copy 2 big files" by "downloading 2 MP3, or HD movies, or eBooks"...)
Multithreading means that within a program there are different processes (which are called threads) that run simultaneously. As an example, if you use Microsoft Word, there is a foreground process that processes everything you type - that is, while you type letters, the letters appear on the screen. On the other hand, there is a background process that does spell-checking. This is clearly a separate process (thread), and one that has a lower priority; if you type quickly, or paste a lot of text, it can take a while for spelling errors to be marked as such.
* More than one thread doing I/O on the same device (on an I/O bound task)
* More than one thread using the same data that must be locked
-emman
* More than one thread doing I/O on the same device (on an I/O bound task)* More than one thread using the same data that must be locked
A flange threaded in center used for weld or different types of threaded pipe.
Black steel depending on schedule can be threaded from 1/8" - 8" Personally I threaded up to 6"
# interpreted and compiled# simple # robust and secure # platform independent and portable # multithreaded and interactive# object oriented # dynamic and extensible
What skills do you need to become a good Java programmer?A good grounding in object-oriented theory.An understanding of the component-based programming paradigm.Understand potential emplorers' business processesServer side JDBC, socket, multi-threaded, algorithmic, and high throughput development.Be very hands on and skilled in building systems and programming frameworks from the bottom up.
* More than one thread doing I/O on the same device (on an I/O bound task)* More than one thread using the same data that must be locked
454. if it is also stamped with hi performance, it should have threaded studs for components on heads.
No deck is threaded it is the headset and the forks that can be threaded or threadless
A flange threaded in center used for weld or different types of threaded pipe.
the features of oop are:Emphasis is on data rather than procedure.Programs are divided into what are known as objects.Data structures are designed such that they characterize the objects.Functions that operate on the data of an object are tied together in the data structure.Data is Hidden and cannot be accessed by external functions.Objects may communicate with each other through functions.New data and functions can be easily added whenever necessary.Follows bottom-up approach in program design.others are :· Robust· Multi threaded· Architecture Neutral· High Performance· Distributed· Dynamic
Multi-tasking! Multiple-core model microprocessors typically perform better in highly-threaded tasks or any applications that require processor multitasking. Keep in mine multi-core processors typically have less per-core performance the higher number of cores they have. This means that, while an 8 core processor does better in highly threaded applications, it will more than likely exhibit lacking performance in single / lightly threaded workloads, such as older programs and most games. Most gamers will tell you that quad or even dual core processors are the best for gaming, due to their lower power requirements, thermal output, and better performance-per-core ratio.
Yes.
Black steel depending on schedule can be threaded from 1/8" - 8" Personally I threaded up to 6"
Divide the threaded length by the lead length. For single threaded screws the lead is the same as the pitch.
"I got my eyebrows threaded for the first time today."
Outdoor spigots are always threaded and not soldered on.
Any Spyder threaded barrels.