1. Visual Studio 2015 setting은:
2.
#include <omp.h>omp_get_thread_num()를 위해 필요함.
3. OpenMP constructs:
#pragma omp parallel for#pragma omp critical- Optional name을 이용해서 서로 다른 여러 개의 critical section을 정의할 수 있음:
#pragma omp critical (name_of_the_critical_section) - All CRITICAL sections which are unnamed, are treated as the same section (https://computing.llnl.gov/tutorials/openMP/#CRITICAL).
4. 참고로,
#include "Windows.h"는 Sleep()을 위한 것임 (OpenMP와 상관 없음).#include <iostream>
#include <omp.h>
#include "Windows.h"
using namespace std;
void First();
void Second();
void Third();
int main() {
#pragma omp parallel for
for (int i = 0; i < 100; ++i) {
const int tid = omp_get_thread_num();
#pragma omp critical
cout << tid << ": * Processing: " << i << endl;
#pragma omp critical
cout << tid << ": 1. The first job" << endl;
First();
#pragma omp critical
cout << tid << ": 2. The second job" << endl;
Second();
#pragma omp critical
cout << tid << ": 3. The third job" << endl;
Third();
cout << endl;
}
return 0;
}
void First() { Sleep(1000); }
void Second() { Sleep(500); }
void Third() { Sleep(2000); }
