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+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *is % allowed in string
+ */
+
+#include <memory>
+#include <string>
+
+#include <gflags/gflags.h>
+#include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+
+#include "src/cpp/thread_manager/thread_manager.h"
+#include "test/cpp/util/test_config.h"
+
+namespace grpc {
+class ThreadManagerTest final : public grpc::ThreadManager {
+ public:
+ ThreadManagerTest()
+ : ThreadManager(kMinPollers, kMaxPollers),
+ num_do_work_(0),
+ num_poll_for_work_(0),
+ num_work_found_(0) {}
+
+ grpc::ThreadManager::WorkStatus PollForWork(void **tag, bool *ok) override;
+ void DoWork(void *tag, bool ok) override;
+ void PerformTest();
+
+ private:
+ void SleepForMs(int sleep_time_ms);
+
+ static const int kMinPollers = 2;
+ static const int kMaxPollers = 10;
+
+ static const int kPollingTimeoutMsec = 10;
+ static const int kDoWorkDurationMsec = 1;
+
+ // PollForWork will return SHUTDOWN after these many number of invocations
+ static const int kMaxNumPollForWork = 50;
+
+ gpr_atm num_do_work_; // Number of calls to DoWork
+ gpr_atm num_poll_for_work_; // Number of calls to PollForWork
+ gpr_atm num_work_found_; // Number of times WORK_FOUND was returned
+};
+
+void ThreadManagerTest::SleepForMs(int duration_ms) {
+ gpr_timespec sleep_time =
+ gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
+ gpr_time_from_millis(duration_ms, GPR_TIMESPAN));
+ gpr_sleep_until(sleep_time);
+}
+
+grpc::ThreadManager::WorkStatus ThreadManagerTest::PollForWork(void **tag,
+ bool *ok) {
+ int call_num = gpr_atm_no_barrier_fetch_add(&num_poll_for_work_, 1);
+
+ if (call_num >= kMaxNumPollForWork) {
+ Shutdown();
+ return SHUTDOWN;
+ }
+
+ // Simulate "polling for work" by sleeping for sometime
+ SleepForMs(kPollingTimeoutMsec);
+
+ *tag = nullptr;
+ *ok = true;
+
+ // Return timeout roughly 1 out of every 3 calls
+ if (call_num % 3 == 0) {
+ return TIMEOUT;
+ } else {
+ gpr_atm_no_barrier_fetch_add(&num_work_found_, 1);
+ return WORK_FOUND;
+ }
+}
+
+void ThreadManagerTest::DoWork(void *tag, bool ok) {
+ gpr_atm_no_barrier_fetch_add(&num_do_work_, 1);
+ SleepForMs(kDoWorkDurationMsec); // Simulate doing work by sleeping
+}
+
+void ThreadManagerTest::PerformTest() {
+ // Initialize() starts the ThreadManager
+ Initialize();
+
+ // Wait for all the threads to gracefully terminate
+ Wait();
+
+ // The number of times DoWork() was called is equal to the number of times
+ // WORK_FOUND was returned
+ gpr_log(GPR_DEBUG, "DoWork() called %ld times",
+ gpr_atm_no_barrier_load(&num_do_work_));
+ GPR_ASSERT(gpr_atm_no_barrier_load(&num_do_work_) ==
+ gpr_atm_no_barrier_load(&num_work_found_));
+}
+} // namespace grpc
+
+int main(int argc, char **argv) {
+ std::srand(std::time(NULL));
+
+ grpc::testing::InitTest(&argc, &argv, true);
+ grpc::ThreadManagerTest test_rpc_manager;
+ test_rpc_manager.PerformTest();
+
+ return 0;
+}