blob: 6f803335ad5ab988f1b88dbbf40a1f3f5b11890f [file] [log] [blame]
Elliott Hughes8daa0922011-09-11 13:46:25 -07001/*
2 * Copyright (C) 2011 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 "thread.h"
18
19#include <sys/time.h>
20#include <sys/resource.h>
21#include <limits.h>
22#include <errno.h>
23
Elliott Hughesffb465f2012-03-01 18:46:05 -080024#include <corkscrew/backtrace.h>
Elliott Hughes8daa0922011-09-11 13:46:25 -070025#include <cutils/sched_policy.h>
26#include <utils/threads.h>
27
28#include "macros.h"
29
30namespace art {
31
32/*
33 * Conversion map for "nice" values.
34 *
35 * We use Android thread priority constants to be consistent with the rest
36 * of the system. In some cases adjacent entries may overlap.
37 */
38static const int kNiceValues[10] = {
39 ANDROID_PRIORITY_LOWEST, /* 1 (MIN_PRIORITY) */
40 ANDROID_PRIORITY_BACKGROUND + 6,
41 ANDROID_PRIORITY_BACKGROUND + 3,
42 ANDROID_PRIORITY_BACKGROUND,
43 ANDROID_PRIORITY_NORMAL, /* 5 (NORM_PRIORITY) */
44 ANDROID_PRIORITY_NORMAL - 2,
45 ANDROID_PRIORITY_NORMAL - 4,
46 ANDROID_PRIORITY_URGENT_DISPLAY + 3,
47 ANDROID_PRIORITY_URGENT_DISPLAY + 2,
48 ANDROID_PRIORITY_URGENT_DISPLAY /* 10 (MAX_PRIORITY) */
49};
50
51void Thread::SetNativePriority(int newPriority) {
52 if (newPriority < 1 || newPriority > 10) {
53 LOG(WARNING) << "bad priority " << newPriority;
54 newPriority = 5;
55 }
56
57 int newNice = kNiceValues[newPriority-1];
58 pid_t tid = GetTid();
59
60 if (newNice >= ANDROID_PRIORITY_BACKGROUND) {
61 set_sched_policy(tid, SP_BACKGROUND);
62 } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) {
63 set_sched_policy(tid, SP_FOREGROUND);
64 }
65
66 if (setpriority(PRIO_PROCESS, tid, newNice) != 0) {
67 PLOG(INFO) << *this << " setPriority(PRIO_PROCESS, " << tid << ", " << newNice << ") failed";
68 }
69}
70
71int Thread::GetNativePriority() {
72 errno = 0;
73 int native_priority = getpriority(PRIO_PROCESS, 0);
74 if (native_priority == -1 && errno != 0) {
75 PLOG(WARNING) << "getpriority failed";
76 return Thread::kNormPriority;
77 }
78
79 int managed_priority = Thread::kMinPriority;
80 for (size_t i = 0; i < arraysize(kNiceValues); i++) {
81 if (native_priority >= kNiceValues[i]) {
82 break;
83 }
84 managed_priority++;
85 }
86 if (managed_priority > Thread::kMaxPriority) {
87 managed_priority = Thread::kMaxPriority;
88 }
89 return managed_priority;
90}
91
Elliott Hughesffb465f2012-03-01 18:46:05 -080092void Thread::DumpNativeStack(std::ostream& os) const {
93 const size_t MAX_DEPTH = 32;
94 UniquePtr<backtrace_frame_t[]> backtrace(new backtrace_frame_t[MAX_DEPTH]);
95 ssize_t frame_count = unwind_backtrace_thread(GetTid(), backtrace.get(), 0, MAX_DEPTH);
96 if (frame_count == -1) {
97 os << " (unwind_backtrace_thread failed for thread " << GetTid() << ".)";
98 return;
99 } else if (frame_count == 0) {
100 return;
101 }
102
103 UniquePtr<backtrace_symbol_t[]> backtrace_symbols(new backtrace_symbol_t[frame_count]);
104 get_backtrace_symbols(backtrace.get(), frame_count, backtrace_symbols.get());
105
106 for (size_t i = 0; i < static_cast<size_t>(frame_count); ++i) {
107 char line[MAX_BACKTRACE_LINE_LENGTH];
108 format_backtrace_line(i, &backtrace[i], &backtrace_symbols[i],
109 line, MAX_BACKTRACE_LINE_LENGTH);
110 os << " " << line << "\n";
111 }
112
113 free_backtrace_symbols(backtrace_symbols.get(), frame_count);
114}
115
Elliott Hughes8daa0922011-09-11 13:46:25 -0700116} // namespace art