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/*
*
* 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.
*is % allowed in string
*/
#include <grpc/support/port_platform.h>
#include "src/cpp/thread_manager/thread_manager.h"
#include <atomic>
#include <chrono>
#include <climits>
#include <memory>
#include <thread>
#include <gtest/gtest.h>
#include <grpc/support/log.h>
#include <grpcpp/grpcpp.h>
#include "test/core/util/test_config.h"
namespace grpc {
namespace {
struct TestThreadManagerSettings {
// The min number of pollers that SHOULD be active in ThreadManager
int min_pollers;
// The max number of pollers that could be active in ThreadManager
int max_pollers;
// The sleep duration in PollForWork() function to simulate "polling"
int poll_duration_ms;
// The sleep duration in DoWork() function to simulate "work"
int work_duration_ms;
// Max number of times PollForWork() is called before shutting down
int max_poll_calls;
// The thread limit (for use in resource quote)
int thread_limit;
// How many should be instantiated
int thread_manager_count;
};
class TestThreadManager final : public grpc::ThreadManager {
public:
TestThreadManager(const char* name, grpc_resource_quota* rq,
const TestThreadManagerSettings& settings)
: ThreadManager(name, rq, settings.min_pollers, settings.max_pollers),
settings_(settings),
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*/, bool /*resources*/) override {
num_do_work_.fetch_add(1, std::memory_order_relaxed);
// Simulate work by sleeping
std::this_thread::sleep_for(
std::chrono::milliseconds(settings_.work_duration_ms));
}
// Get number of times PollForWork() was called
int num_poll_for_work() const {
return num_poll_for_work_.load(std::memory_order_relaxed);
}
// Get number of times PollForWork() returned WORK_FOUND
int num_work_found() const {
return num_work_found_.load(std::memory_order_relaxed);
}
// Get number of times DoWork() was called
int num_do_work() const {
return num_do_work_.load(std::memory_order_relaxed);
}
private:
TestThreadManagerSettings settings_;
// Counters
std::atomic_int num_do_work_; // Number of calls to DoWork
std::atomic_int num_poll_for_work_; // Number of calls to PollForWork
std::atomic_int num_work_found_; // Number of times WORK_FOUND was returned
};
grpc::ThreadManager::WorkStatus TestThreadManager::PollForWork(void** tag,
bool* ok) {
int call_num = num_poll_for_work_.fetch_add(1, std::memory_order_relaxed);
if (call_num >= settings_.max_poll_calls) {
Shutdown();
return SHUTDOWN;
}
// Simulate "polling" duration
std::this_thread::sleep_for(
std::chrono::milliseconds(settings_.poll_duration_ms));
*tag = nullptr;
*ok = true;
// Return timeout roughly 1 out of every 3 calls just to make the test a bit
// more interesting
if (call_num % 3 == 0) {
return TIMEOUT;
}
num_work_found_.fetch_add(1, std::memory_order_relaxed);
return WORK_FOUND;
}
class ThreadManagerTest
: public ::testing::TestWithParam<TestThreadManagerSettings> {
protected:
void SetUp() override {
grpc_resource_quota* rq = grpc_resource_quota_create("Thread manager test");
if (GetParam().thread_limit > 0) {
grpc_resource_quota_set_max_threads(rq, GetParam().thread_limit);
}
for (int i = 0; i < GetParam().thread_manager_count; i++) {
thread_manager_.emplace_back(
new TestThreadManager("TestThreadManager", rq, GetParam()));
}
grpc_resource_quota_unref(rq);
for (auto& tm : thread_manager_) {
tm->Initialize();
}
for (auto& tm : thread_manager_) {
tm->Wait();
}
}
std::vector<std::unique_ptr<TestThreadManager>> thread_manager_;
};
TestThreadManagerSettings scenarios[] = {
{2 /* min_pollers */, 10 /* max_pollers */, 10 /* poll_duration_ms */,
1 /* work_duration_ms */, 50 /* max_poll_calls */,
INT_MAX /* thread_limit */, 1 /* thread_manager_count */},
{1 /* min_pollers */, 1 /* max_pollers */, 1 /* poll_duration_ms */,
10 /* work_duration_ms */, 50 /* max_poll_calls */, 3 /* thread_limit */,
2 /* thread_manager_count */}};
INSTANTIATE_TEST_SUITE_P(ThreadManagerTest, ThreadManagerTest,
::testing::ValuesIn(scenarios));
TEST_P(ThreadManagerTest, TestPollAndWork) {
for (auto& tm : thread_manager_) {
// Verify that The number of times DoWork() was called is equal to the
// number of times WORK_FOUND was returned
gpr_log(GPR_DEBUG, "DoWork() called %d times", tm->num_do_work());
EXPECT_GE(tm->num_poll_for_work(), GetParam().max_poll_calls);
EXPECT_EQ(tm->num_do_work(), tm->num_work_found());
}
}
TEST_P(ThreadManagerTest, TestThreadQuota) {
if (GetParam().thread_limit > 0) {
for (auto& tm : thread_manager_) {
EXPECT_GE(tm->num_poll_for_work(), GetParam().max_poll_calls);
EXPECT_LE(tm->GetMaxActiveThreadsSoFar(), GetParam().thread_limit);
}
}
}
} // namespace
} // namespace grpc
int main(int argc, char** argv) {
std::srand(std::time(nullptr));
grpc::testing::TestEnvironment env(&argc, argv);
::testing::InitGoogleTest(&argc, argv);
grpc_init();
auto ret = RUN_ALL_TESTS();
grpc_shutdown();
return ret;
}
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