a parallel_for implementation based on atomic queues
The parallel_for templates replace #pragma omp parallel for.
We use a callback that takes the iteration number.
To avoid compiler confusion, we can specify the iteration type in the template.
#include "paryfor.hpp"
int main(int argc, char** argv) {
uint64_t todo_count = std::stoul(argv[1]);
int thread_count = std::stoi(argv[2]);
int chunk_size = std::stoi(argv[3]);
paryfor::parallel_for<uint64_t>(
0, todo_count, thread_count, chunk_size,
[&](uint64_t i, int tid) {
// do work
});
}We don't need to use chunk_size.
If omitted, we use a template that queues single iteration values, rather than ranges.
We can also pass a function that does not take its thread id as an argument.
This utility depends on Maxim Egorushkin's atomic_queue library, which is included in the single header file paryfor.hpp.
Erik Garrison
MIT