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std::thread::join

From cppreference.com
< cpp‎ | thread‎ | thread
Revision as of 08:30, 17 December 2012 by Justmao945 (Talk | contribs)

void join();
(since C++11)

Blocks the current thread until the thread identified by *this finishes its execution.

Contents

Parameters

(none)

Return value

(none)

Exceptions

std::system_error if joinable() == false or an error occurs.

Example

#include <iostream>
#include <thread>
#include <chrono>
 
void foo()
{
    // simulate expensive operation
    std::this_thread::sleep_for(std::chrono::seconds(1));
}
 
void bar()
{
    // simulate expensive operation
    std::this_thread::sleep_for(std::chrono::seconds(1));
}
 
int main()
{
    std::cout << "starting first helper...\n";
    std::thread helper1(foo);
 
    std::cout << "starting second helper...\n";
    std::thread helper2(bar);
 
    std::cout << "waiting for helpers to finish...\n";
    helper1.join();
    helper2.join();
 
    std::cout << "done!\n";
}

Output:

starting first helper...
starting second helper...
waiting for helpers to finish...
done!

See also

permits the thread to execute independently from the thread handle
(public member function) [edit]
checks whether the thread is joinable, i.e. potentially running in parallel context
(public member function) [edit]