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dispatch.cpp
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56 lines (42 loc) · 1.33 KB
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// 2018/11/13 - created by Chun-Xun Lin
//
// The program demonstrates how to use asynchronous dispatch
// with callback invoked on finish.
#include <taskflow/taskflow.hpp>
#include <random>
int main() {
using namespace std::literals::chrono_literals;
tf::Taskflow tf;
const size_t num_jobs {10000};
std::atomic<size_t> counter {0};
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<> dice(1, 100);
// Insert tasks with sleeping for random ms and increasing the counter
for(size_t i=0; i<num_jobs; ++i){
tf.emplace([t=dice(gen), &counter](){
std::this_thread::sleep_for(std::chrono::microseconds(t));
counter++;
});
}
// Register a callback to check the counter
auto fu = tf.dispatch([&](){
assert(counter == num_jobs);
std::cout << "Finish dispatched tasks\n";
});
fu.get(); // Wait for the dispatched tasks
// Insert tasks with sleeping for random ms and decreasing the counter
for(size_t i=0; i<num_jobs; ++i){
tf.emplace([t=dice(gen), &counter](){
std::this_thread::sleep_for(std::chrono::microseconds(t));
counter--;
});
}
// Register a callback to check the counter
tf.dispatch([&counter](){
assert(counter == 0);
std::cout << "Finish silently dispatched tasks\n";
});
tf.wait_for_all();
return 0;
}