Problem with Threads in VisualGDB for Linux

[hanooi]

Hello,

I’m getting the error of “undefined reference to ‘pthread_create'” when I try to build the following multithreading example from this site:

https://www.geeksforgeeks.org/multithreading-in-cpp/

The source example I’m trying to compile using the Raspberry Pi toolchain below.  What and where should I set the flags to enable me to link the <thread> library properly so the below would compile on my VisualGDB for the Raspberry?

// CPP program to demonstrate multithreading
// using three different callables.
#include <iostream>
#include <thread>
using namespace std;

// A dummy function
void foo(int Z)
{
for (int i = 0; i < Z; i++) {
cout << “Thread using function”
” pointer as callable\n”;
}
}

// A callable object
class thread_obj {
public:
void operator()(int x)
{
for (int i = 0; i < x; i++)
cout << “Thread using function”
” object as callable\n”;
}
}
;

int main()
{
cout << “Threads 1 and 2 and 3 ”
“operating independently” << endl;

// This thread is launched by using
// function pointer as callable
thread th1(foo, 3);

// This thread is launched by using
// function object as callable
thread th2(thread_obj(), 3);

// Define a Lambda Expression
auto f = [](int x) {
for (int i = 0; i < x; i++)
cout << “Thread using lambda”
” expression as callable\n”;
};

// This thread is launched by using
// lamda expression as callable
thread th3(f, 3);

// Wait for the threads to finish
// Wait for thread t1 to finish
th1.join();

// Wait for thread t2 to finish
th2.join();

// Wait for thread t3 to finish
th3.join();

return 0;
}

• This topic was modified 5 years, 4 months ago by hanooi.

[support]

Please try adding “pthread” to the “library names” field on the Build Settings page of VisualGDB Project Properties. You can read more about various linker-related settings here: http://visualgdb.com/support/linkerinputs/

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