Tech Sujhav : std::thread

It is a class supported in and on-ward c++11, to create & manage thread. This class provides it’s user to various forms of constructor to create thread, destructor and some built-in function to manage threads.

The task that we want to be performed by our thread, we must put that in a function. As we done in Here in our example “displayAcitviy”.

In a system, each thread is identified by a unique number known as Thread ID.

If there is no thread in program then it is called signal-threaded program. Because at lease our main() function is processed by scheduler and hence usually called as MAIN THREAD.

Thus our example have two thread (1) Created by t1 object (2) Main thread.

std::thread uses pthread library that is usually called as POSIX Library.

Here is the first program to create a thread. It would be very useful if you copy following code and try to compile it on your system or can you any online compiler.

Code

#include <iostream>
#include<thread> //Thread Header
using namespace std;

//displayAcitviy- is the actual function that is being
//called by the thread.
void displayAcitviy()
{
   cout<<"www.techsujhav.com"<<endl;
}
int main()
{
   cout<<"Main:: Going to create thread "<<endl;

   //Create thread
   std::thread t1(displayAcitviy);

   //join()- wait for thread t1 to complete its activity
   t1.join();

   //exit Main
   cout<<"Main:: Exit"<<endl;

   return 0;
}

Compile:
$ g++ FirstThread.cpp -o FirstThread –lpthread

//–lpthread is the threading library on linux, usually called POSIX library

Output:

Main:: Going to create thread
www.techsujhav.com
Main:: Exit

PREV:: Types of thread

Main Page

std::thread::joinable() ::NEXT

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