From 96f8728b06740dd6b63ab463319b4795209dbec4 Mon Sep 17 00:00:00 2001
From: Craig Tiller <ctiller@google.com>
Date: Mon, 13 Feb 2017 12:39:12 -0800
Subject: [PATCH] Add a comparison benchmark of acquiring a mutex

---
 test/cpp/microbenchmarks/bm_closure.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/test/cpp/microbenchmarks/bm_closure.cc b/test/cpp/microbenchmarks/bm_closure.cc
index de354410e52..dac7d9c6779 100644
--- a/test/cpp/microbenchmarks/bm_closure.cc
+++ b/test/cpp/microbenchmarks/bm_closure.cc
@@ -170,6 +170,20 @@ static void BM_ClosureSched3OnExecCtx(benchmark::State& state) {
 }
 BENCHMARK(BM_ClosureSched3OnExecCtx);
 
+static void BM_AcquireMutex(benchmark::State& state) {
+  // for comparison with the combiner stuff below
+  gpr_mu mu;
+  gpr_mu_init(&mu);
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  while (state.KeepRunning()) {
+    gpr_mu_lock(&mu);
+    DoNothing(&exec_ctx, NULL, GRPC_ERROR_NONE);
+    gpr_mu_unlock(&mu);
+  }
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+BENCHMARK(BM_AcquireMutex);
+
 static void BM_ClosureSchedOnCombiner(benchmark::State& state) {
   grpc_combiner* combiner = grpc_combiner_create(NULL);
   grpc_closure c;