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//
// LimitedTaskQueue_test.cpp
// DispatchProcessingDemo
//
// Created by Chris Jones on 9/27/11.
//
#include <iostream>
#include <catch.hpp>
#include <chrono>
#include <memory>
#include <atomic>
#include <thread>
#include <mutex>
#include "oneapi/tbb/task_arena.h"
#include "FWCore/Concurrency/interface/WaitingTask.h"
#include "FWCore/Concurrency/interface/FinalWaitingTask.h"
#include "FWCore/Concurrency/interface/WaitingTaskHolder.h"
#include "FWCore/Concurrency/interface/LimitedTaskQueue.h"
#include "FWCore/Concurrency/interface/FunctorTask.h"
using namespace std::chrono_literals;
namespace {
std::mutex g_requiresMutex;
}
//catch2 REQUIRE is not thread safe
#define SAFE_REQUIRE(__var__) \
{ \
std::lock_guard g{g_requiresMutex}; \
REQUIRE(__var__); \
}
TEST_CASE("LimitedTaskQueue", "[LimitedTaskQueue]") {
SECTION("push") {
{
std::atomic<unsigned int> count{0};
edm::LimitedTaskQueue queue{1};
{
oneapi::tbb::task_group group;
edm::FinalWaitingTask lastTask(group);
edm::WaitingTaskHolder waitingTask(group, &lastTask);
queue.push(group, [&count, waitingTask] {
REQUIRE(count++ == 0u);
std::this_thread::sleep_for(10us);
});
queue.push(group, [&count, waitingTask] {
REQUIRE(count++ == 1u);
std::this_thread::sleep_for(10us);
});
queue.push(group, [&count, lastTask = std::move(waitingTask)] {
REQUIRE(count++ == 2u);
std::this_thread::sleep_for(10us);
});
lastTask.wait();
REQUIRE(count == 3u);
}
}
{
std::atomic<unsigned int> count{0};
constexpr unsigned int kMax = 2;
edm::LimitedTaskQueue queue{kMax};
{
oneapi::tbb::task_group group;
edm::FinalWaitingTask lastTask(group);
edm::WaitingTaskHolder waitingTask(group, &lastTask);
queue.push(group, [&count, waitingTask, kMax] {
SAFE_REQUIRE(count++ < kMax);
std::this_thread::sleep_for(10us);
--count;
});
queue.push(group, [&count, waitingTask, kMax] {
SAFE_REQUIRE(count++ < kMax);
std::this_thread::sleep_for(10us);
--count;
});
queue.push(group, [&count, lastTask = std::move(waitingTask), kMax] {
SAFE_REQUIRE(count++ < kMax);
std::this_thread::sleep_for(10us);
--count;
});
lastTask.wait();
REQUIRE(count == 0u);
}
}
}
SECTION("pause") {
std::atomic<unsigned int> count{0};
edm::LimitedTaskQueue queue{1};
{
{
oneapi::tbb::task_group group;
edm::FinalWaitingTask lastTask(group);
edm::WaitingTaskHolder waitingTask(group, &lastTask);
edm::LimitedTaskQueue::Resumer resumer;
std::atomic<bool> resumerSet{false};
std::exception_ptr e1;
queue.pushAndPause(group,
[&resumer, &resumerSet, &count, waitingTask, &e1](edm::LimitedTaskQueue::Resumer iResumer) {
resumer = std::move(iResumer);
resumerSet = true;
try {
SAFE_REQUIRE(++count == 1u);
} catch (...) {
e1 = std::current_exception();
}
});
std::exception_ptr e2;
queue.push(group, [&count, waitingTask, &e2] {
try {
SAFE_REQUIRE(++count == 2u);
} catch (...) {
e2 = std::current_exception();
}
});
std::exception_ptr e3;
queue.push(group, [&count, lastTask = std::move(waitingTask), &e3] {
try {
SAFE_REQUIRE(++count == 3u);
} catch (...) {
e3 = std::current_exception();
}
});
std::this_thread::sleep_for(100us);
REQUIRE(2u >= count);
while (not resumerSet) {
}
SAFE_REQUIRE(resumer.resume());
lastTask.wait();
REQUIRE(count == 3u);
if (e1) {
std::rethrow_exception(e1);
}
if (e2) {
std::rethrow_exception(e2);
}
if (e3) {
std::rethrow_exception(e3);
}
}
}
}
SECTION("stress test") {
oneapi::tbb::task_group group;
constexpr unsigned int kMax = 3;
edm::LimitedTaskQueue queue{kMax};
unsigned int index = 100;
const unsigned int nTasks = 1000;
while (0 != --index) {
edm::FinalWaitingTask lastTask(group);
std::atomic<unsigned int> count{0};
std::atomic<unsigned int> nRunningTasks{0};
std::atomic<bool> waitToStart{true};
{
edm::WaitingTaskHolder waitingTask(group, &lastTask);
group.run([&queue, &waitToStart, &group, waitingTask, &count, &nRunningTasks, kMax] {
while (waitToStart) {
}
for (unsigned int i = 0; i < nTasks; ++i) {
queue.push(group, [&count, waitingTask, &nRunningTasks, kMax] {
auto nrt = nRunningTasks++;
if (nrt >= kMax) {
std::cout << "ERROR " << nRunningTasks << " >= " << kMax << std::endl;
SAFE_REQUIRE(nrt < kMax);
}
++count;
--nRunningTasks;
});
}
});
group.run([&queue, &waitToStart, &group, waitingTask, &count, &nRunningTasks, kMax] {
waitToStart = false;
for (unsigned int i = 0; i < nTasks; ++i) {
queue.push(group, [&count, waitingTask, &nRunningTasks, kMax] {
auto nrt = nRunningTasks++;
if (nrt >= kMax) {
std::cout << "ERROR " << nRunningTasks << " >= " << kMax << std::endl;
SAFE_REQUIRE(nrt < kMax);
}
++count;
--nRunningTasks;
});
}
});
}
lastTask.wait();
REQUIRE(nRunningTasks == 0u);
REQUIRE(2 * nTasks == count);
}
}
}
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