cs205-lecture-examples

Example codes used during Harvard CS205 lectures
git clone https://git.0xfab.ch/cs205-lecture-examples.git
Log | Files | Refs | README | LICENSE

omp_demo.cpp (493B)

      1 #include <iostream>
      2 #include <omp.h>
      3 
      4 int main(void)
      5 {
      6     for (int i = 1; i <= 4; ++i)
      7     {
      8         std::cout << "Loop counter = " << i << ":\n";
      9 #pragma omp parallel num_threads(i) if (parallel: i > 2)
     10         {
     11             const int tid = omp_get_thread_num(); // get my ID
     12             // the next line is a critical section! (std::cout is not
     13             // thread-safe)
     14 #pragma omp critical
     15             std::cout << "\tHello from thread " << tid << '\n';
     16         }
     17     }
     18     return 0;
     19 }