105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "thread.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <limits.h>
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#include <errno.h>
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#include <cutils/sched_policy.h>
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#include <utils/threads.h>
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#include "base/macros.h"
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namespace art {
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// Conversion map for "nice" values.
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//
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// We use Android thread priority constants to be consistent with the rest
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// of the system. In some cases adjacent entries may overlap.
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//
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static const int kNiceValues[10] = {
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ANDROID_PRIORITY_LOWEST, // 1 (MIN_PRIORITY)
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ANDROID_PRIORITY_BACKGROUND + 6,
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ANDROID_PRIORITY_BACKGROUND + 3,
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ANDROID_PRIORITY_BACKGROUND,
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ANDROID_PRIORITY_NORMAL, // 5 (NORM_PRIORITY)
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ANDROID_PRIORITY_NORMAL - 2,
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ANDROID_PRIORITY_NORMAL - 4,
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ANDROID_PRIORITY_URGENT_DISPLAY + 3,
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ANDROID_PRIORITY_URGENT_DISPLAY + 2,
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ANDROID_PRIORITY_URGENT_DISPLAY // 10 (MAX_PRIORITY)
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};
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void Thread::SetNativePriority(int newPriority) {
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if (newPriority < 1 || newPriority > 10) {
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LOG(WARNING) << "bad priority " << newPriority;
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newPriority = 5;
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}
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int newNice = kNiceValues[newPriority-1];
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pid_t tid = GetTid();
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// TODO: b/18249098 The code below is broken. It uses getpriority() as a proxy for whether a
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// thread is already in the SP_FOREGROUND cgroup. This is not necessarily true for background
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// processes, where all threads are in the SP_BACKGROUND cgroup. This means that callers will
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// have to call setPriority twice to do what they want :
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//
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// Thread.setPriority(Thread.MIN_PRIORITY); // no-op wrt to cgroups
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// Thread.setPriority(Thread.MAX_PRIORITY); // will actually change cgroups.
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if (newNice >= ANDROID_PRIORITY_BACKGROUND) {
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set_sched_policy(tid, SP_BACKGROUND);
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} else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) {
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set_sched_policy(tid, SP_FOREGROUND);
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}
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if (setpriority(PRIO_PROCESS, tid, newNice) != 0) {
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PLOG(INFO) << *this << " setPriority(PRIO_PROCESS, " << tid << ", " << newNice << ") failed";
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}
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}
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int Thread::GetNativePriority() {
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errno = 0;
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int native_priority = getpriority(PRIO_PROCESS, 0);
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if (native_priority == -1 && errno != 0) {
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PLOG(WARNING) << "getpriority failed";
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return kNormThreadPriority;
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}
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int managed_priority = kMinThreadPriority;
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for (size_t i = 0; i < arraysize(kNiceValues); i++) {
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if (native_priority >= kNiceValues[i]) {
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break;
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}
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managed_priority++;
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}
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if (managed_priority > kMaxThreadPriority) {
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managed_priority = kMaxThreadPriority;
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}
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return managed_priority;
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}
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void Thread::SetUpAlternateSignalStack() {
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// Bionic does this for us.
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}
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void Thread::TearDownAlternateSignalStack() {
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// Bionic does this for us.
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}
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} // namespace art
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