1 files changed, 191 insertions, 0 deletions
diff --git a/test/core/support/mpscq_test.cc b/test/core/support/mpscq_test.cc
new file mode 100644
index 0000000000..d5b7bf21c1
--- /dev/null
+++ b/test/core/support/mpscq_test.cc
@@ -0,0 +1,191 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "src/core/lib/support/mpscq.h"
+
+#include <stdlib.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/useful.h>
+#include "test/core/util/test_config.h"
+
+typedef struct test_node {
+  gpr_mpscq_node node;
+  size_t i;
+  size_t* ctr;
+} test_node;
+
+static test_node* new_node(size_t i, size_t* ctr) {
+  test_node* n = static_cast<test_node*>(gpr_malloc(sizeof(test_node)));
+  n->i = i;
+  n->ctr = ctr;
+  return n;
+}
+
+static void test_serial(void) {
+  gpr_log(GPR_DEBUG, "test_serial");
+  gpr_mpscq q;
+  gpr_mpscq_init(&q);
+  for (size_t i = 0; i < 10000000; i++) {
+    gpr_mpscq_push(&q, &new_node(i, NULL)->node);
+  }
+  for (size_t i = 0; i < 10000000; i++) {
+    test_node* n = (test_node*)gpr_mpscq_pop(&q);
+    GPR_ASSERT(n);
+    GPR_ASSERT(n->i == i);
+    gpr_free(n);
+  }
+}
+
+typedef struct {
+  size_t ctr;
+  gpr_mpscq* q;
+  gpr_event* start;
+} thd_args;
+
+#define THREAD_ITERATIONS 10000
+
+static void test_thread(void* args) {
+  thd_args* a = static_cast<thd_args*>(args);
+  gpr_event_wait(a->start, gpr_inf_future(GPR_CLOCK_REALTIME));
+  for (size_t i = 1; i <= THREAD_ITERATIONS; i++) {
+    gpr_mpscq_push(a->q, &new_node(i, &a->ctr)->node);
+  }
+}
+
+static void test_mt(void) {
+  gpr_log(GPR_DEBUG, "test_mt");
+  gpr_event start;
+  gpr_event_init(&start);
+  gpr_thd_id thds[100];
+  thd_args ta[GPR_ARRAY_SIZE(thds)];
+  gpr_mpscq q;
+  gpr_mpscq_init(&q);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(thds); i++) {
+    gpr_thd_options options = gpr_thd_options_default();
+    gpr_thd_options_set_joinable(&options);
+    ta[i].ctr = 0;
+    ta[i].q = &q;
+    ta[i].start = &start;
+    GPR_ASSERT(gpr_thd_new(&thds[i], test_thread, &ta[i], &options));
+  }
+  size_t num_done = 0;
+  size_t spins = 0;
+  gpr_event_set(&start, (void*)1);
+  while (num_done != GPR_ARRAY_SIZE(thds)) {
+    gpr_mpscq_node* n;
+    while ((n = gpr_mpscq_pop(&q)) == NULL) {
+      spins++;
+    }
+    test_node* tn = (test_node*)n;
+    GPR_ASSERT(*tn->ctr == tn->i - 1);
+    *tn->ctr = tn->i;
+    if (tn->i == THREAD_ITERATIONS) num_done++;
+    gpr_free(tn);
+  }
+  gpr_log(GPR_DEBUG, "spins: %" PRIdPTR, spins);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(thds); i++) {
+    gpr_thd_join(thds[i]);
+  }
+  gpr_mpscq_destroy(&q);
+}
+
+typedef struct {
+  thd_args* ta;
+  size_t num_thds;
+  gpr_mu mu;
+  size_t num_done;
+  size_t spins;
+  gpr_mpscq* q;
+  gpr_event* start;
+} pull_args;
+
+static void pull_thread(void* arg) {
+  pull_args* pa = static_cast<pull_args*>(arg);
+  gpr_event_wait(pa->start, gpr_inf_future(GPR_CLOCK_REALTIME));
+
+  for (;;) {
+    gpr_mu_lock(&pa->mu);
+    if (pa->num_done == pa->num_thds) {
+      gpr_mu_unlock(&pa->mu);
+      return;
+    }
+    gpr_mpscq_node* n;
+    while ((n = gpr_mpscq_pop(pa->q)) == NULL) {
+      pa->spins++;
+    }
+    test_node* tn = (test_node*)n;
+    GPR_ASSERT(*tn->ctr == tn->i - 1);
+    *tn->ctr = tn->i;
+    if (tn->i == THREAD_ITERATIONS) pa->num_done++;
+    gpr_free(tn);
+    gpr_mu_unlock(&pa->mu);
+  }
+}
+
+static void test_mt_multipop(void) {
+  gpr_log(GPR_DEBUG, "test_mt_multipop");
+  gpr_event start;
+  gpr_event_init(&start);
+  gpr_thd_id thds[100];
+  gpr_thd_id pull_thds[100];
+  thd_args ta[GPR_ARRAY_SIZE(thds)];
+  gpr_mpscq q;
+  gpr_mpscq_init(&q);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(thds); i++) {
+    gpr_thd_options options = gpr_thd_options_default();
+    gpr_thd_options_set_joinable(&options);
+    ta[i].ctr = 0;
+    ta[i].q = &q;
+    ta[i].start = &start;
+    GPR_ASSERT(gpr_thd_new(&thds[i], test_thread, &ta[i], &options));
+  }
+  pull_args pa;
+  pa.ta = ta;
+  pa.num_thds = GPR_ARRAY_SIZE(thds);
+  pa.spins = 0;
+  pa.num_done = 0;
+  pa.q = &q;
+  pa.start = &start;
+  gpr_mu_init(&pa.mu);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(pull_thds); i++) {
+    gpr_thd_options options = gpr_thd_options_default();
+    gpr_thd_options_set_joinable(&options);
+    GPR_ASSERT(gpr_thd_new(&pull_thds[i], pull_thread, &pa, &options));
+  }
+  gpr_event_set(&start, (void*)1);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(pull_thds); i++) {
+    gpr_thd_join(pull_thds[i]);
+  }
+  gpr_log(GPR_DEBUG, "spins: %" PRIdPTR, pa.spins);
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(thds); i++) {
+    gpr_thd_join(thds[i]);
+  }
+  gpr_mpscq_destroy(&q);
+}
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  test_serial();
+  test_mt();
+  test_mt_multipop();
+  return 0;
+}