236 lines
6.9 KiB
C++
236 lines
6.9 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
|
|
// for linear algebra.
|
|
//
|
|
// Copyright (C) 2016 Dmitry Vyukov <dvyukov@google.com>
|
|
// Copyright (C) 2016 Benoit Steiner <benoit.steiner.goog@gmail.com>
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla
|
|
// Public License v. 2.0. If a copy of the MPL was not distributed
|
|
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
#define EIGEN_USE_THREADS
|
|
#include <cstdlib>
|
|
#include "main.h"
|
|
#include <Eigen/CXX11/ThreadPool>
|
|
|
|
|
|
// Visual studio doesn't implement a rand_r() function since its
|
|
// implementation of rand() is already thread safe
|
|
int rand_reentrant(unsigned int* s) {
|
|
#ifdef EIGEN_COMP_MSVC_STRICT
|
|
EIGEN_UNUSED_VARIABLE(s);
|
|
return rand();
|
|
#else
|
|
return rand_r(s);
|
|
#endif
|
|
}
|
|
|
|
void test_basic_runqueue()
|
|
{
|
|
RunQueue<int, 4> q;
|
|
// Check empty state.
|
|
VERIFY(q.Empty());
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PopFront());
|
|
std::vector<int> stolen;
|
|
VERIFY_IS_EQUAL(0u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(0u, stolen.size());
|
|
// Push one front, pop one front.
|
|
VERIFY_IS_EQUAL(0, q.PushFront(1));
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
VERIFY_IS_EQUAL(1, q.PopFront());
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
// Push front to overflow.
|
|
VERIFY_IS_EQUAL(0, q.PushFront(2));
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushFront(3));
|
|
VERIFY_IS_EQUAL(2u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushFront(4));
|
|
VERIFY_IS_EQUAL(3u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushFront(5));
|
|
VERIFY_IS_EQUAL(4u, q.Size());
|
|
VERIFY_IS_EQUAL(6, q.PushFront(6));
|
|
VERIFY_IS_EQUAL(4u, q.Size());
|
|
VERIFY_IS_EQUAL(5, q.PopFront());
|
|
VERIFY_IS_EQUAL(3u, q.Size());
|
|
VERIFY_IS_EQUAL(4, q.PopFront());
|
|
VERIFY_IS_EQUAL(2u, q.Size());
|
|
VERIFY_IS_EQUAL(3, q.PopFront());
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
VERIFY_IS_EQUAL(2, q.PopFront());
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PopFront());
|
|
// Push one back, pop one back.
|
|
VERIFY_IS_EQUAL(0, q.PushBack(7));
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
VERIFY_IS_EQUAL(1u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(1u, stolen.size());
|
|
VERIFY_IS_EQUAL(7, stolen[0]);
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
stolen.clear();
|
|
// Push back to overflow.
|
|
VERIFY_IS_EQUAL(0, q.PushBack(8));
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushBack(9));
|
|
VERIFY_IS_EQUAL(2u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushBack(10));
|
|
VERIFY_IS_EQUAL(3u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushBack(11));
|
|
VERIFY_IS_EQUAL(4u, q.Size());
|
|
VERIFY_IS_EQUAL(12, q.PushBack(12));
|
|
VERIFY_IS_EQUAL(4u, q.Size());
|
|
// Pop back in halves.
|
|
VERIFY_IS_EQUAL(2u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(2u, stolen.size());
|
|
VERIFY_IS_EQUAL(10, stolen[0]);
|
|
VERIFY_IS_EQUAL(11, stolen[1]);
|
|
VERIFY_IS_EQUAL(2u, q.Size());
|
|
stolen.clear();
|
|
VERIFY_IS_EQUAL(1u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(1u, stolen.size());
|
|
VERIFY_IS_EQUAL(9, stolen[0]);
|
|
VERIFY_IS_EQUAL(1u, q.Size());
|
|
stolen.clear();
|
|
VERIFY_IS_EQUAL(1u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(1u, stolen.size());
|
|
VERIFY_IS_EQUAL(8, stolen[0]);
|
|
stolen.clear();
|
|
VERIFY_IS_EQUAL(0u, q.PopBackHalf(&stolen));
|
|
VERIFY_IS_EQUAL(0u, stolen.size());
|
|
// Empty again.
|
|
VERIFY(q.Empty());
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
VERIFY_IS_EQUAL(0, q.PushFront(1));
|
|
VERIFY_IS_EQUAL(0, q.PushFront(2));
|
|
VERIFY_IS_EQUAL(0, q.PushFront(3));
|
|
VERIFY_IS_EQUAL(1, q.PopBack());
|
|
VERIFY_IS_EQUAL(2, q.PopBack());
|
|
VERIFY_IS_EQUAL(3, q.PopBack());
|
|
VERIFY(q.Empty());
|
|
VERIFY_IS_EQUAL(0u, q.Size());
|
|
}
|
|
|
|
// Empty tests that the queue is not claimed to be empty when is is in fact not.
|
|
// Emptiness property is crucial part of thread pool blocking scheme,
|
|
// so we go to great effort to ensure this property. We create a queue with
|
|
// 1 element and then push 1 element (either front or back at random) and pop
|
|
// 1 element (either front or back at random). So queue always contains at least
|
|
// 1 element, but otherwise changes chaotically. Another thread constantly tests
|
|
// that the queue is not claimed to be empty.
|
|
void test_empty_runqueue()
|
|
{
|
|
RunQueue<int, 4> q;
|
|
q.PushFront(1);
|
|
std::atomic<bool> done(false);
|
|
std::thread mutator([&q, &done]() {
|
|
unsigned rnd = 0;
|
|
std::vector<int> stolen;
|
|
for (int i = 0; i < 1 << 18; i++) {
|
|
if (rand_reentrant(&rnd) % 2)
|
|
VERIFY_IS_EQUAL(0, q.PushFront(1));
|
|
else
|
|
VERIFY_IS_EQUAL(0, q.PushBack(1));
|
|
if (rand_reentrant(&rnd) % 2)
|
|
VERIFY_IS_EQUAL(1, q.PopFront());
|
|
else {
|
|
for (;;) {
|
|
if (q.PopBackHalf(&stolen) == 1) {
|
|
stolen.clear();
|
|
break;
|
|
}
|
|
VERIFY_IS_EQUAL(0u, stolen.size());
|
|
}
|
|
}
|
|
}
|
|
done = true;
|
|
});
|
|
while (!done) {
|
|
VERIFY(!q.Empty());
|
|
int size = q.Size();
|
|
VERIFY_GE(size, 1);
|
|
VERIFY_LE(size, 2);
|
|
}
|
|
VERIFY_IS_EQUAL(1, q.PopFront());
|
|
mutator.join();
|
|
}
|
|
|
|
// Stress is a chaotic random test.
|
|
// One thread (owner) calls PushFront/PopFront, other threads call PushBack/
|
|
// PopBack. Ensure that we don't crash, deadlock, and all sanity checks pass.
|
|
void test_stress_runqueue()
|
|
{
|
|
static const int kEvents = 1 << 18;
|
|
RunQueue<int, 8> q;
|
|
std::atomic<int> total(0);
|
|
std::vector<std::unique_ptr<std::thread>> threads;
|
|
threads.emplace_back(new std::thread([&q, &total]() {
|
|
int sum = 0;
|
|
int pushed = 1;
|
|
int popped = 1;
|
|
while (pushed < kEvents || popped < kEvents) {
|
|
if (pushed < kEvents) {
|
|
if (q.PushFront(pushed) == 0) {
|
|
sum += pushed;
|
|
pushed++;
|
|
}
|
|
}
|
|
if (popped < kEvents) {
|
|
int v = q.PopFront();
|
|
if (v != 0) {
|
|
sum -= v;
|
|
popped++;
|
|
}
|
|
}
|
|
}
|
|
total += sum;
|
|
}));
|
|
for (int i = 0; i < 2; i++) {
|
|
threads.emplace_back(new std::thread([&q, &total]() {
|
|
int sum = 0;
|
|
for (int j = 1; j < kEvents; j++) {
|
|
if (q.PushBack(j) == 0) {
|
|
sum += j;
|
|
continue;
|
|
}
|
|
EIGEN_THREAD_YIELD();
|
|
j--;
|
|
}
|
|
total += sum;
|
|
}));
|
|
threads.emplace_back(new std::thread([&q, &total]() {
|
|
int sum = 0;
|
|
std::vector<int> stolen;
|
|
for (int j = 1; j < kEvents;) {
|
|
if (q.PopBackHalf(&stolen) == 0) {
|
|
EIGEN_THREAD_YIELD();
|
|
continue;
|
|
}
|
|
while (stolen.size() && j < kEvents) {
|
|
int v = stolen.back();
|
|
stolen.pop_back();
|
|
VERIFY_IS_NOT_EQUAL(v, 0);
|
|
sum += v;
|
|
j++;
|
|
}
|
|
}
|
|
while (stolen.size()) {
|
|
int v = stolen.back();
|
|
stolen.pop_back();
|
|
VERIFY_IS_NOT_EQUAL(v, 0);
|
|
while ((v = q.PushBack(v)) != 0) EIGEN_THREAD_YIELD();
|
|
}
|
|
total -= sum;
|
|
}));
|
|
}
|
|
for (size_t i = 0; i < threads.size(); i++) threads[i]->join();
|
|
VERIFY(q.Empty());
|
|
VERIFY(total.load() == 0);
|
|
}
|
|
|
|
EIGEN_DECLARE_TEST(cxx11_runqueue)
|
|
{
|
|
CALL_SUBTEST_1(test_basic_runqueue());
|
|
CALL_SUBTEST_2(test_empty_runqueue());
|
|
CALL_SUBTEST_3(test_stress_runqueue());
|
|
}
|