exercise3_ompintro_deadlock.cpp

// build: g++ -O2 -fopenmp exercise3_ompintro_deadlock.cpp -o ex3_omp_deadlock
// run:   OMP_NUM_THREADS=4 ./ex3_omp

#include <iostream>
#include <vector>
#include <omp.h>

int main()
{
#pragma omp parallel default(none) shared(std::cout)
    {
        const int thread_num = omp_get_thread_num();

        if (thread_num == 0) {
            std::cout << "I've caused a deadlock!" << std::endl;
        }
        else {
#pragma omp barrier
        }

#pragma omp critical
        std::cout << "I'm thread " << thread_num << std::endl;
    }

    return 0;
}