ruby多线程_Ruby中的多线程

比眉伴天荒 2023-03-05 09:36 24阅读 0赞

ruby多线程

## Ruby多线程 **(**Ruby Multithreading**)** ##

If we talk about a normal program in Ruby, all statements are executed sequentially because it used to have a single thread commonly known as the main thread. But our program may have more than one thread and this concept is known as **multithreading**. The advantage of **multithreading** is that our program uses less memory space and share the same address. With the help of this concept, we can perform more than one task at the same instant of time. We know that we can create a new thread with the help of thread.new keyword.

如果我们谈论的是Ruby中的普通程序，则所有语句都将按顺序执行，因为它曾经只有一个通常称为主线程的线程。 但是我们的程序可能有多个线程，这一概念被称为**多线程** 。 **多线程**的优点是我们的程序使用更少的内存空间并共享相同的地址。 借助这一概念，我们可以在同一时间执行多个任务。 我们知道可以借助thread.new关键字创建一个新线程。

Now, let us see how we create multiple threads with the help of the examples provided below:

现在，让我们看看如何借助下面提供的示例创建多个线程：

=begin
    Ruby program to demonstrate multithreading
    =end
    
    def Includehelp1 
    	a = 0
    	while a <= 10
    		puts "Thread execution: #{a}"
    		sleep(1) 
    		a = a + 1
    	end
    end
    
    def Includehelp2 
    	b = 0
    	while b <= 5
    		puts "Thread2: #{b}"
    		sleep(2) 
    		b = b + 1
    	end
    end
    
    x = Thread.new{
        Includehelp1()} 
    y = Thread.new{
        Includehelp2()} 
    x.join 
    y.join

**Output**

**输出量**

RUN 1:
    Thread execution: 0
    Thread2: 0
    Thread execution: 1
    Thread execution: 2
    Thread2: 1
    Thread execution: 3
    Thread execution: 4
    Thread2: 2
    Thread execution: 5
    Thread execution: 6
    Thread2: 3
    Thread execution: 7
    Thread execution: 8
    Thread2: 4
    Thread execution: 9
    Thread execution: 10
    Thread2: 5
    
    RUN 2:
    Thread execution: 0
    Thread2: 0
    Thread execution: 1
    Thread2: 1
    Thread execution: 2
    Thread execution: 3
    Thread2: 2
    Thread execution: 4
    Thread execution: 5
    Thread2: 3
    Thread execution: 6
    Thread execution: 7
    Thread2: 4
    Thread execution: 8
    Thread execution: 9
    Thread2: 5
    Thread execution: 10

In the above example, you can observe that both the outputs are different even though there is no change in the program. This is because the execution of the thread is carried out based on their priority and by default, all the threads have equal priority. Their execution is dependent on the pointer. You can also observe that both the threads are executing at once.

在上面的示例中，即使程序没有变化，您也可以观察到两个输出都是不同的。 这是因为线程的执行是基于它们的优先级执行的，并且默认情况下，所有线程都具有相同的优先级。 它们的执行取决于指针。 您还可以观察到两个线程同时执行。

Threads can also use the same resource in the program, refer to the following example,

线程也可以在程序中使用相同的资源，请参考以下示例，

=begin
    Ruby program to demonstrate multithreading	
    using same resource
    =end
    
    $g_var = 10
    
    def Includehelp1 
    	a = 0
    	while a <= 10
    		puts "Thread execution: #{a}"
    		sleep(1) 
    		a = a + 1
    	end
    	puts "Inside Thread 1 ; #{$g_var+19}"
    end
    
    def Includehelp2 
    	b = 0
    	while b <= 5
    		puts "Thread2: #{b}"
    		sleep(2) 
    		b = b + 1
    	end
    	puts "Inside Thread 2 ; #{$g_var+10}"
    end
    
    x = Thread.new{
        Includehelp1()} 
    y = Thread.new{
        Includehelp2()} 
    x.join 
    y.join

**Output**

**输出量**

Thread execution: 0
    Thread2: 0
    Thread execution: 1
    Thread execution: 2
    Thread2: 1
    Thread execution: 3
    Thread2: 2
    Thread execution: 4
    Thread execution: 5
    Thread2: 3
    Thread execution: 6
    Thread execution: 7
    Thread2: 4
    Thread execution: 8
    Thread execution: 9
    Thread2: 5
    Thread execution: 10
    Inside Thread 1 ; 29
    Inside Thread 2 ; 20

In the above code, you can observe that there exists a global variable name as $g\_var. Both the threads can access it but when they are manipulating its value, it is not creating any impact on the value manipulated by other threads.

在上面的代码中，您可以观察到存在一个名为$ g\_var的全局变量名称。 两个线程都可以访问它，但是当它们操纵它的值时，它不会对其他线程操纵的值产生任何影响。

> 翻译自: [https://www.includehelp.com/ruby/multithreading.aspx][https_www.includehelp.com_ruby_multithreading.aspx]

ruby多线程

[https_www.includehelp.com_ruby_multithreading.aspx]: https://www.includehelp.com/ruby/multithreading.aspx