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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2020 Intel Corporation
#include "../test_precomp.hpp"
#include <unordered_set>
#include <thread>
#include "executor/last_value.hpp"
namespace opencv_test {
using namespace cv::gapi;
TEST(LastValue, PushPop) {
own::last_written_value<int> v;
for (int i = 0; i < 100; i++) {
v.push(i);
int x = 1;
v.pop(x);
EXPECT_EQ(x, i);
}
}
TEST(LastValue, TryPop) {
own::last_written_value<int> v;
int x = 0;
EXPECT_FALSE(v.try_pop(x));
v.push(1);
EXPECT_TRUE(v.try_pop(x));
EXPECT_EQ(1, x);
}
TEST(LastValue, Clear) {
own::last_written_value<int> v;
v.push(42);
v.clear();
int x = 0;
EXPECT_FALSE(v.try_pop(x));
}
TEST(LastValue, Overwrite) {
own::last_written_value<int> v;
v.push(42);
v.push(0);
int x = -1;
EXPECT_TRUE(v.try_pop(x));
EXPECT_EQ(0, x);
}
// In this test, every writer thread produces its own range of integer
// numbers, writing those to a shared queue.
//
// Every reader thread pops elements from the queue (until -1 is
// reached) and stores those in its own associated set.
//
// Finally, the master thread waits for completion of all other
// threads and verifies that all the necessary data is
// produced/obtained.
namespace {
using StressParam = std::tuple<int // Num writer threads
,int // Num elements per writer
,int>; // Num reader threads
constexpr int STOP_SIGN = -1;
constexpr int BASE = 1000;
}
struct LastValue_: public ::testing::TestWithParam<StressParam> {
using V = own::last_written_value<int>;
using S = std::unordered_set<int>;
static void writer(int base, int writes, V& v) {
for (int i = 0; i < writes; i++) {
if (i % 2) {
std::this_thread::sleep_for(std::chrono::milliseconds{1});
}
v.push(base + i);
}
v.push(STOP_SIGN);
}
static void reader(V& v, S& s) {
int x = 0;
while (true) {
v.pop(x);
if (x == STOP_SIGN) {
// If this thread was lucky enough to read this STOP_SIGN,
// push it back to v to make other possible readers able
// to read it again (note due to the last_written_value
// semantic, those STOP_SIGN could be simply lost i.e.
// overwritten.
v.push(STOP_SIGN);
return;
}
s.insert(x);
}
}
};
TEST_P(LastValue_, Test)
{
int num_writers = 0;
int num_writes = 0;
int num_readers = 0;
std::tie(num_writers, num_writes, num_readers) = GetParam();
CV_Assert(num_writers < 20);
CV_Assert(num_writes < BASE);
V v;
// Start reader threads
std::vector<S> storage(num_readers);
std::vector<std::thread> readers;
for (S& s : storage) {
readers.emplace_back(reader, std::ref(v), std::ref(s));
}
// Start writer threads, also pre-generate reference numbers
S reference;
std::vector<std::thread> writers;
for (int w = 0; w < num_writers; w++) {
writers.emplace_back(writer, w*BASE, num_writes, std::ref(v));
for (int r = 0; r < num_writes; r++) {
reference.insert(w*BASE + r);
}
}
// Wait for completions
for (auto &t : readers) t.join();
for (auto &t : writers) t.join();
// Validate the result. Some values are read, and the values are
// correct (i.e. such values have been written)
std::size_t num_values_read = 0u;
for (const auto &s : storage) {
num_values_read += s.size();
for (auto &x : s) {
EXPECT_TRUE(reference.count(x) > 0);
}
}
// NOTE: Some combinations may end-up in 0 values read
// it is normal, the main thing is that the test shouldn't hang!
EXPECT_LE(0u, num_values_read);
}
INSTANTIATE_TEST_CASE_P(LastValueStress, LastValue_,
Combine( Values(1, 2, 4, 8, 16) // writers
, Values(32, 96, 256) // writes
, Values(1, 2, 10))); // readers
} // namespace opencv_test
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