[wpinet] Move network portions of wpiutil into new wpinet library (#4077)

wpinet/src/main/native/cpp/uv/Work.cpp

@@ -0,0 +1,50 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "wpinet/uv/Work.h"
+
+#include "wpinet/uv/Loop.h"
+
+namespace wpi::uv {
+
+WorkReq::WorkReq() {
+  error = [this](Error err) { GetLoop().error(err); };
+}
+
+void QueueWork(Loop& loop, const std::shared_ptr<WorkReq>& req) {
+  int err = uv_queue_work(
+      loop.GetRaw(), req->GetRaw(),
+      [](uv_work_t* req) {
+        auto& h = *static_cast<WorkReq*>(req->data);
+        h.work();
+      },
+      [](uv_work_t* req, int status) {
+        auto& h = *static_cast<WorkReq*>(req->data);
+        if (status < 0) {
+          h.ReportError(status);
+        } else {
+          h.afterWork();
+        }
+        h.Release();  // this is always a one-shot
+      });
+  if (err < 0) {
+    loop.ReportError(err);
+  } else {
+    req->Keep();
+  }
+}
+
+void QueueWork(Loop& loop, std::function<void()> work,
+               std::function<void()> afterWork) {
+  auto req = std::make_shared<WorkReq>();
+  if (work) {
+    req->work.connect(std::move(work));
+  }
+  if (afterWork) {
+    req->afterWork.connect(std::move(afterWork));
+  }
+  QueueWork(loop, req);
+}
+
+}  // namespace wpi::uv