1/*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "concurrent_helper.h"
17#include "tools/log.h"
18
19namespace Commonlibrary::Concurrent::Common::Helper {
20using SystemMemoryLevel = ConcurrentHelper::SystemMemoryLevel;
21
22static constexpr double LOW_MEMORY_RATIO = 0.2;
23static constexpr double MODERATE_MEMORY_RATIO = 0.5;
24static const char* AVAILABLE_MEM = "MemAvailable:";
25static const char* MEM_INFO = "/proc/meminfo";
26static const char* TOTAL_MEM = "MemTotal:";
27
28#if defined(OHOS_PLATFORM)
29uint64_t ConcurrentHelper::ParseLine(const std::string& line)
30{
31    std::istringstream iss(line);
32    std::string key;
33    uint64_t value;
34    std::string unit;
35    if (iss >> key >> value >> unit) {
36        return value;
37    }
38    return 0;
39}
40
41std::optional<double> ConcurrentHelper::GetSystemMemoryRatio()
42{
43    uint64_t totalMemory = 0;
44    uint64_t availableMemory = 0;
45    std::ifstream meminfo(MEM_INFO);
46    if (!meminfo.is_open()) {
47        HILOG_ERROR("ConcurrentHelper:: Open %{public}s failed", MEM_INFO);
48        return std::nullopt;
49    }
50    std::string line;
51    while (std::getline(meminfo, line)) {
52        if (line.find(TOTAL_MEM) == 0) {
53            totalMemory = ParseLine(line);
54        } else if (line.find(AVAILABLE_MEM) == 0) {
55            availableMemory = ParseLine(line);
56        }
57    }
58    if (totalMemory == 0) {
59        HILOG_ERROR("ConcurrentHelper:: Failed to read the MemTotal.");
60        return std::nullopt;
61    }
62    return static_cast<double>(availableMemory) / static_cast<double>(totalMemory);
63}
64
65SystemMemoryLevel ConcurrentHelper::GetMemoryLevel()
66{
67    const auto ratio = GetSystemMemoryRatio();
68    if (!ratio.has_value()) { // error happens when read memory info, just return the MEMORY_LEVEL_LOW
69        return SystemMemoryLevel::MEMORY_LEVEL_LOW;
70    }
71    if (ratio.value() > MODERATE_MEMORY_RATIO) {
72        return SystemMemoryLevel::MEMORY_LEVEL_NORMAL;
73    } else if (ratio.value() > LOW_MEMORY_RATIO) {
74        return SystemMemoryLevel::MEMORY_LEVEL_MODERATE;
75    } else {
76        return SystemMemoryLevel::MEMORY_LEVEL_LOW;
77    }
78}
79#endif
80
81bool ConcurrentHelper::IsLowMemory()
82{
83#if defined(OHOS_PLATFORM)
84    return GetMemoryLevel() == SystemMemoryLevel::MEMORY_LEVEL_LOW;
85#else
86    return false;
87#endif
88}
89
90bool ConcurrentHelper::IsModerateMemory()
91{
92#if defined(OHOS_PLATFORM)
93    return GetMemoryLevel() == SystemMemoryLevel::MEMORY_LEVEL_MODERATE;
94#else
95    return false;
96#endif
97}
98} // namespace Commonlibrary::Concurrent::TaskPoolModule