mirror of https://github.com/odrling/Aegisub
56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
|
#include <iostream>
|
||
|
|
#include <omp.h>
|
||
|
|
|
||
|
|
double wasteTime(double in)
|
||
|
|
{
|
||
|
|
double accum = in;
|
||
|
|
for (size_t i=0;i<5000000;i++) {
|
||
|
|
accum = accum + accum/2.0 - accum/3.0;
|
||
|
|
}
|
||
|
|
return accum;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
using namespace std;
|
||
|
|
cout << "OpenMP test:\n";
|
||
|
|
bool run = true;
|
||
|
|
int n = 0;
|
||
|
|
omp_set_num_threads(8);
|
||
|
|
#pragma omp parallel shared(run,n)
|
||
|
|
{
|
||
|
|
while (run) {
|
||
|
|
int myTask;
|
||
|
|
double lol = 0.0;
|
||
|
|
|
||
|
|
#pragma omp critical (secA)
|
||
|
|
{
|
||
|
|
myTask = n;
|
||
|
|
n++;
|
||
|
|
if (myTask >= 50) run = false;
|
||
|
|
if (run) {
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " on task " << myTask << "/1.\n";
|
||
|
|
lol -= wasteTime(myTask * 1.0);
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " got " << lol << " on task " << myTask << "/1. Task done.\n";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (run) {
|
||
|
|
#pragma omp critical (secB)
|
||
|
|
{
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " on task " << myTask << "/2.\n";
|
||
|
|
lol += wasteTime(myTask * 2.0);
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " got " << lol << " on task " << myTask << "/2. Task done.\n";
|
||
|
|
}
|
||
|
|
|
||
|
|
#pragma omp critical (secC)
|
||
|
|
{
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " on task " << myTask << "/3.\n";
|
||
|
|
lol -= wasteTime(myTask * 3.0);
|
||
|
|
cout << "Thread #" << omp_get_thread_num() << " finished task " << myTask << " with the useless result of " << lol << "\n";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|