1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "minikin/Layout.h"
18
19 #include <condition_variable>
20 #include <mutex>
21 #include <random>
22 #include <thread>
23
24 #include <cutils/log.h>
25 #include <gtest/gtest.h>
26
27 #include "minikin/FontCollection.h"
28 #include "minikin/Macros.h"
29 #include "minikin/MinikinPaint.h"
30
31 #include "FontTestUtils.h"
32 #include "MinikinInternal.h"
33 #include "PathUtils.h"
34
35 namespace minikin {
36
37 constexpr int LAYOUT_COUNT_PER_COLLECTION = 500;
38 constexpr int COLLECTION_COUNT_PER_THREAD = 15;
39 constexpr int NUM_THREADS = 10;
40
41 std::mutex gMutex;
42 std::condition_variable gCv;
43 bool gReady GUARDED_BY(gMutex) = false;
44
generateTestText(std::mt19937 * mt,int lettersInWord,int wordsInText)45 static std::vector<uint16_t> generateTestText(std::mt19937* mt, int lettersInWord,
46 int wordsInText) {
47 std::uniform_int_distribution<uint16_t> dist('A', 'Z');
48
49 std::vector<uint16_t> text;
50 text.reserve((lettersInWord + 1) * wordsInText - 1);
51 for (int i = 0; i < wordsInText; ++i) {
52 if (i != 0) {
53 text.emplace_back(' ');
54 }
55 for (int j = 0; j < lettersInWord; ++j) {
56 text.emplace_back(dist(*mt));
57 }
58 }
59 return text;
60 }
61
thread_main(int tid)62 static void thread_main(int tid) {
63 {
64 // Wait until all threads are created.
65 std::unique_lock<std::mutex> lock(gMutex);
66 gCv.wait(lock, [] { return gReady; });
67 }
68
69 std::mt19937 mt(tid);
70
71 for (int i = 0; i < COLLECTION_COUNT_PER_THREAD; ++i) {
72 MinikinPaint paint(buildFontCollection("Ascii.ttf"));
73 paint.size = 10.0f; // Make 1em = 10px
74
75 for (int j = 0; j < LAYOUT_COUNT_PER_COLLECTION; ++j) {
76 // Generates 10 of 3-letter words so that the word sometimes hit the cache.
77 std::vector<uint16_t> text = generateTestText(&mt, 3, 10);
78 Layout layout(text, Range(0, text.size()), Bidi::LTR, paint, StartHyphenEdit::NO_EDIT,
79 EndHyphenEdit::NO_EDIT);
80 for (size_t k = 0; k < text.size(); ++k) {
81 // All characters in Ascii.ttf has 1.0em horizontal advance.
82 LOG_ALWAYS_FATAL_IF(layout.getCharAdvance(k) != 10.0f,
83 "Memory corruption detected.");
84 }
85 }
86 }
87 }
88
TEST(MultithreadTest,ThreadSafeStressTest)89 TEST(MultithreadTest, ThreadSafeStressTest) {
90 std::vector<std::thread> threads;
91
92 {
93 std::unique_lock<std::mutex> lock(gMutex);
94 threads.reserve(NUM_THREADS);
95 for (int i = 0; i < NUM_THREADS; ++i) {
96 threads.emplace_back(&thread_main, i);
97 }
98 gReady = true;
99 }
100 gCv.notify_all();
101
102 for (auto& thread : threads) {
103 thread.join();
104 }
105 }
106
107 } // namespace minikin
108