bench: add uv_queue_work ping-pong measurement (#3425)

CMakeLists.txt

@@ -417,6 +417,7 @@ if(LIBUV_BUILD_TESTS)
     test/benchmark-fs-stat.c
     test/benchmark-getaddrinfo.c
     test/benchmark-loop-count.c
+    test/benchmark-queue-work.c
     test/benchmark-million-async.c
     test/benchmark-million-timers.c
     test/benchmark-multi-accept.c

test/benchmark-list.h

@@ -72,6 +72,7 @@ BENCHMARK_DECLARE (async_pummel_1)
 BENCHMARK_DECLARE (async_pummel_2)
 BENCHMARK_DECLARE (async_pummel_4)
 BENCHMARK_DECLARE (async_pummel_8)
+BENCHMARK_DECLARE (queue_work)
 BENCHMARK_DECLARE (spawn)
 BENCHMARK_DECLARE (thread_create)
 BENCHMARK_DECLARE (million_async)
@@ -155,6 +156,7 @@ TASK_LIST_START
   BENCHMARK_ENTRY  (async_pummel_2)
   BENCHMARK_ENTRY  (async_pummel_4)
   BENCHMARK_ENTRY  (async_pummel_8)
+  BENCHMARK_ENTRY  (queue_work)
 
   BENCHMARK_ENTRY  (spawn)
   BENCHMARK_ENTRY  (thread_create)

test/benchmark-queue-work.c

@@ -0,0 +1,68 @@
+/* Copyright libuv contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "task.h"
+#include "uv.h"
+
+static int done = 0;
+static unsigned events = 0;
+static unsigned result;
+
+static unsigned fastrand(void) {
+  static unsigned g = 0;
+  g = g * 214013 + 2531011;
+  return g;
+}
+
+static void work_cb(uv_work_t* req) {
+  req->data = &result;
+  *(unsigned*)req->data = fastrand();
+}
+
+static void after_work_cb(uv_work_t* req, int status) {
+  events++;
+  if (!done)
+    ASSERT_EQ(0, uv_queue_work(req->loop, req, work_cb, after_work_cb));
+}
+
+static void timer_cb(uv_timer_t* handle) { done = 1; }
+
+BENCHMARK_IMPL(queue_work) {
+  uv_timer_t timer_handle;
+  uv_work_t work;
+  uv_loop_t* loop;
+  int timeout;
+
+  loop = uv_default_loop();
+  timeout = 5000;
+
+  ASSERT_EQ(0, uv_timer_init(loop, &timer_handle));
+  ASSERT_EQ(0, uv_timer_start(&timer_handle, timer_cb, timeout, 0));
+
+  ASSERT_EQ(0, uv_queue_work(loop, &work, work_cb, after_work_cb));
+  ASSERT_EQ(0, uv_run(loop, UV_RUN_DEFAULT));
+
+  printf("%s async jobs in %.1f seconds (%s/s)\n", fmt(events), timeout / 1000.,
+         fmt(events / (timeout / 1000.)));
+
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}