1 /*
2 * Copyright (C) 2022 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 #define LOG_TAG "Process"
18 #include <utils/Log.h>
19 #include <mediautils/Process.h>
20
21 #include <android-base/file.h>
22 #include <android-base/strings.h>
23 #include <cstdlib>
24
25 namespace {
26
processLine(std::string_view s,std::map<std::string,double> & m)27 void processLine(std::string_view s, std::map<std::string, double>& m) {
28 if (s.empty()) return;
29
30 const size_t colon_pos = s.find(':');
31 if (colon_pos == std::string_view::npos) return;
32
33 const size_t space_pos = s.find(' ');
34 if (space_pos == 0 || space_pos == std::string_view::npos || space_pos > colon_pos) return;
35 std::string key(s.data(), s.data() + space_pos);
36
37 const size_t value_pos = s.find_first_not_of(' ', colon_pos + 1);
38 if (value_pos == std::string_view::npos) return;
39
40 const double value = strtod(s.data() + value_pos, nullptr /* end */);
41 m[std::move(key)] = value;
42 }
43
44 } // namespace
45
46 namespace android::mediautils {
47
getThreadSchedAsString(pid_t tid)48 std::string getThreadSchedAsString(pid_t tid) {
49 const pid_t pid = getpid();
50 const std::string path = std::string("/proc/").append(std::to_string(pid))
51 .append("/task/").append(std::to_string(tid)).append("/sched");
52 std::string sched;
53 (void)android::base::ReadFileToString(path.c_str(), &sched);
54 return sched;
55 }
56
parseThreadSchedString(const std::string & schedString)57 std::map<std::string, double> parseThreadSchedString(const std::string& schedString) {
58 std::map<std::string, double> m;
59 if (schedString.empty()) return m;
60 std::vector<std::string> stringlist = android::base::Split(schedString, "\n");
61
62 // OK we use values not strings... m["summary"] = stringlist[0];
63 for (size_t i = 2; i < stringlist.size(); ++i) {
64 processLine(stringlist[i], m);
65 }
66 return m;
67 }
68
69 } // namespace android::mediautils
70