Use futures for queuing pull and tarball tasks

cpp/ci_logic.cpp

@@ -639,7 +639,11 @@ std::string CiLogic::queue_pull_tarball(std::vector<std::shared_ptr<PackageConf>
     std::mutex task_assignment_mutex;
 
     try {
+        std::vector<std::future<void>> futures;
         for (auto &r : repos) {
+            futures.push_back(std::async(std::launch::async, [this, &task_queue, &job_statuses,
+                                                              &encountered_items, &task_assignment_mutex,
+                                                              &r]() mutable {
                 {
                     std::lock_guard<std::mutex> lock(task_assignment_mutex);
                     auto found_it = encountered_items.find(r->package->name);
@@ -655,7 +659,7 @@ std::string CiLogic::queue_pull_tarball(std::vector<std::shared_ptr<PackageConf>
                         r->packaging_commit = existing_item->first_pkgconf->packaging_commit;
                         r->upstream_commit  = existing_item->first_pkgconf->upstream_commit;
                         r->sync();
-                    continue;
+                        return;
                     }
                 }
                 // REAL pull
@@ -692,7 +696,9 @@ std::string CiLogic::queue_pull_tarball(std::vector<std::shared_ptr<PackageConf>
                     new_item->first_tarball_task = r->get_task_by_jobstatus(job_statuses->at("tarball"));
                     encountered_items[r->package->name] = new_item;
                 }
+            }));
         }
+        for (auto& future : futures) future.get();
         msg = "Succeeded";
     } catch (...) {
         msg = "Failed";