106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/threading/platform_thread.h"
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#include <errno.h>
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#include <sys/resource.h>
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#include "base/android/jni_android.h"
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#include "base/android/thread_utils.h"
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/threading/thread_id_name_manager.h"
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#include "base/tracked_objects.h"
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#include "jni/ThreadUtils_jni.h"
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namespace base {
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namespace {
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int ThreadNiceValue(ThreadPriority priority) {
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// These nice values are taken from Android, which uses nice
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// values like linux, but defines some preset nice values.
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// Process.THREAD_PRIORITY_AUDIO = -16
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// Process.THREAD_PRIORITY_BACKGROUND = 10
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// Process.THREAD_PRIORITY_DEFAULT = 0;
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// Process.THREAD_PRIORITY_DISPLAY = -4;
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// Process.THREAD_PRIORITY_FOREGROUND = -2;
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// Process.THREAD_PRIORITY_LESS_FAVORABLE = 1;
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// Process.THREAD_PRIORITY_LOWEST = 19;
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// Process.THREAD_PRIORITY_MORE_FAVORABLE = -1;
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// Process.THREAD_PRIORITY_URGENT_AUDIO = -19;
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// Process.THREAD_PRIORITY_URGENT_DISPLAY = -8;
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// We use -6 for display, but we may want to split this
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// into urgent (-8) and non-urgent (-4).
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static const int threadPriorityAudio = -16;
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static const int threadPriorityBackground = 10;
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static const int threadPriorityDefault = 0;
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static const int threadPriorityDisplay = -6;
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switch (priority) {
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case kThreadPriority_RealtimeAudio:
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return threadPriorityAudio;
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case kThreadPriority_Background:
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return threadPriorityBackground;
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case kThreadPriority_Normal:
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return threadPriorityDefault;
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case kThreadPriority_Display:
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return threadPriorityDisplay;
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default:
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NOTREACHED() << "Unknown priority.";
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return 0;
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}
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}
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} // namespace
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//static
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void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
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ThreadPriority priority) {
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// On Android, we set the Audio priority through JNI as Audio priority
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// will also allow the process to run while it is backgrounded.
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if (priority == kThreadPriority_RealtimeAudio) {
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JNIEnv* env = base::android::AttachCurrentThread();
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Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
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return;
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}
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// setpriority(2) will set a thread's priority if it is passed a tid as
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// the 'process identifier', not affecting the rest of the threads in the
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// process. Setting this priority will only succeed if the user has been
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// granted permission to adjust nice values on the system.
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DCHECK_NE(handle.id_, kInvalidThreadId);
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int kNiceSetting = ThreadNiceValue(priority);
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if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting))
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LOG(ERROR) << "Failed to set nice value of thread to " << kNiceSetting;
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}
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void PlatformThread::SetName(const char* name) {
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ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
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tracked_objects::ThreadData::InitializeThreadContext(name);
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}
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void InitThreading() {
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}
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void InitOnThread() {
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// Threads on linux/android may inherit their priority from the thread
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// where they were created. This sets all new threads to the default.
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PlatformThread::SetThreadPriority(PlatformThread::CurrentHandle(),
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kThreadPriority_Normal);
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}
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void TerminateOnThread() {
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base::android::DetachFromVM();
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}
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size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
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return 0;
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}
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bool RegisterThreadUtils(JNIEnv* env) {
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return RegisterNativesImpl(env);
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}
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} // namespace base
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