101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
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// 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 <stddef.h>
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#include <sys/prctl.h>
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#include <sys/resource.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "base/android/jni_android.h"
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#include "base/base_jni_headers/ThreadUtils_jni.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/platform_thread_internal_posix.h"
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#include "base/threading/thread_id_name_manager.h"
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namespace base {
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namespace internal {
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// - BACKGROUND corresponds to Android's PRIORITY_BACKGROUND = 10 value and can
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// result in heavy throttling and force the thread onto a little core on
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// big.LITTLE devices.
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// - DISPLAY corresponds to Android's PRIORITY_DISPLAY = -4 value.
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// - REALTIME_AUDIO corresponds to Android's PRIORITY_AUDIO = -16 value.
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const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
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{ThreadPriority::BACKGROUND, 10},
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{ThreadPriority::NORMAL, 0},
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{ThreadPriority::DISPLAY, -4},
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{ThreadPriority::REALTIME_AUDIO, -16},
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};
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Optional<bool> CanIncreaseCurrentThreadPriorityForPlatform(
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ThreadPriority priority) {
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if (priority == ThreadPriority::REALTIME_AUDIO)
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return base::make_optional(true);
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return base::nullopt;
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}
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bool SetCurrentThreadPriorityForPlatform(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 == ThreadPriority::REALTIME_AUDIO) {
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JNIEnv* env = base::android::AttachCurrentThread();
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Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
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return true;
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}
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return false;
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}
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Optional<ThreadPriority> GetCurrentThreadPriorityForPlatform() {
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JNIEnv* env = base::android::AttachCurrentThread();
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if (Java_ThreadUtils_isThreadPriorityAudio(
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env, PlatformThread::CurrentId())) {
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return base::make_optional(ThreadPriority::REALTIME_AUDIO);
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}
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return base::nullopt;
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}
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} // namespace internal
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void PlatformThread::SetName(const std::string& name) {
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ThreadIdNameManager::GetInstance()->SetName(name);
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// Like linux, on android we can get the thread names to show up in the
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// debugger by setting the process name for the LWP.
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// We don't want to do this for the main thread because that would rename
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// the process, causing tools like killall to stop working.
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if (PlatformThread::CurrentId() == getpid())
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return;
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// Set the name for the LWP (which gets truncated to 15 characters).
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int err = prctl(PR_SET_NAME, name.c_str());
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if (err < 0 && errno != EPERM)
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DPLOG(ERROR) << "prctl(PR_SET_NAME)";
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}
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void InitThreading() {
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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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#if !defined(ADDRESS_SANITIZER)
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return 0;
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#else
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// AddressSanitizer bloats the stack approximately 2x. Default stack size of
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// 1Mb is not enough for some tests (see http://crbug.com/263749 for example).
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return 2 * (1 << 20); // 2Mb
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#endif
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}
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} // namespace base
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