1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <array>
#include <cstddef>
#include <numeric>
#include <thread>
#include <vector>
#include <catch2/catch.hpp>
#include "common/ring_buffer.h"
namespace Common {
TEST_CASE("RingBuffer: Basic Tests", "[common]") {
RingBuffer<char, 4> buf;
// Pushing values into a ring buffer with space should succeed.
for (std::size_t i = 0; i < 4; i++) {
const char elem = static_cast<char>(i);
const std::size_t count = buf.Push(&elem, 1);
REQUIRE(count == 1U);
}
REQUIRE(buf.Size() == 4U);
// Pushing values into a full ring buffer should fail.
{
const char elem = static_cast<char>(42);
const std::size_t count = buf.Push(&elem, 1);
REQUIRE(count == 0U);
}
REQUIRE(buf.Size() == 4U);
// Popping multiple values from a ring buffer with values should succeed.
{
const std::vector<char> popped = buf.Pop(2);
REQUIRE(popped.size() == 2U);
REQUIRE(popped[0] == 0);
REQUIRE(popped[1] == 1);
}
REQUIRE(buf.Size() == 2U);
// Popping a single value from a ring buffer with values should succeed.
{
const std::vector<char> popped = buf.Pop(1);
REQUIRE(popped.size() == 1U);
REQUIRE(popped[0] == 2);
}
REQUIRE(buf.Size() == 1U);
// Pushing more values than space available should partially suceed.
{
std::vector<char> to_push(6);
std::iota(to_push.begin(), to_push.end(), 88);
const std::size_t count = buf.Push(to_push);
REQUIRE(count == 3U);
}
REQUIRE(buf.Size() == 4U);
// Doing an unlimited pop should pop all values.
{
const std::vector<char> popped = buf.Pop();
REQUIRE(popped.size() == 4U);
REQUIRE(popped[0] == 3);
REQUIRE(popped[1] == 88);
REQUIRE(popped[2] == 89);
REQUIRE(popped[3] == 90);
}
REQUIRE(buf.Size() == 0U);
}
TEST_CASE("RingBuffer: Threaded Test", "[common]") {
RingBuffer<char, 8> buf;
const char seed = 42;
const std::size_t count = 1000000;
std::size_t full = 0;
std::size_t empty = 0;
const auto next_value = [](std::array<char, 2>& value) {
value[0] += 1;
value[1] += 2;
};
std::thread producer{[&] {
std::array<char, 2> value = {seed, seed};
std::size_t i = 0;
while (i < count) {
if (const std::size_t c = buf.Push(&value[0], 2); c > 0) {
REQUIRE(c == 2U);
i++;
next_value(value);
} else {
full++;
std::this_thread::yield();
}
}
}};
std::thread consumer{[&] {
std::array<char, 2> value = {seed, seed};
std::size_t i = 0;
while (i < count) {
if (const std::vector<char> v = buf.Pop(2); v.size() > 0) {
REQUIRE(v.size() == 2U);
REQUIRE(v[0] == value[0]);
REQUIRE(v[1] == value[1]);
i++;
next_value(value);
} else {
empty++;
std::this_thread::yield();
}
}
}};
producer.join();
consumer.join();
REQUIRE(buf.Size() == 0U);
printf("RingBuffer: Threaded Test: full: %zu, empty: %zu\n", full, empty);
}
} // namespace Common
|
