| // Copyright 2012 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/threading/platform_thread.h" |
| |
| #include <errno.h> |
| #include <stddef.h> |
| #include <sys/prctl.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include <optional> |
| |
| #include "base/android/build_info.h" |
| #include "base/android/jni_android.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| #include "base/threading/platform_thread_internal_posix.h" |
| #include "base/threading/thread_id_name_manager.h" |
| |
| // Must come after all headers that specialize FromJniType() / ToJniType(). |
| #include "base/tasks_jni/ThreadUtils_jni.h" |
| |
| namespace base { |
| |
| namespace internal { |
| |
| // - kRealtimeAudio corresponds to Android's PRIORITY_AUDIO = -16 value. |
| // - kDisplay corresponds to Android's PRIORITY_DISPLAY = -4 value. |
| // - kBackground corresponds to Android's PRIORITY_BACKGROUND = 10 |
| // value. Contrary to the matching Java APi in Android <13, this does not |
| // restrict the thread to (subset of) little cores. |
| const ThreadPriorityToNiceValuePairForTest |
| kThreadPriorityToNiceValueMapForTest[7] = { |
| {ThreadPriorityForTest::kRealtimeAudio, -16}, |
| {ThreadPriorityForTest::kDisplay, -4}, |
| {ThreadPriorityForTest::kNormal, 0}, |
| {ThreadPriorityForTest::kResourceEfficient, 0}, |
| {ThreadPriorityForTest::kUtility, 1}, |
| {ThreadPriorityForTest::kBackground, 10}, |
| }; |
| |
| // - kBackground corresponds to Android's PRIORITY_BACKGROUND = 10 value and can |
| // result in heavy throttling and force the thread onto a little core on |
| // big.LITTLE devices. |
| // - kUtility corresponds to Android's THREAD_PRIORITY_LESS_FAVORABLE = 1 value. |
| // - kDisplayCritical corresponds to Android's PRIORITY_DISPLAY = -4 value. |
| // - kRealtimeAudio corresponds to Android's PRIORITY_AUDIO = -16 value. |
| const ThreadTypeToNiceValuePair kThreadTypeToNiceValueMap[7] = { |
| {ThreadType::kBackground, 10}, {ThreadType::kUtility, 1}, |
| {ThreadType::kResourceEfficient, 0}, {ThreadType::kDefault, 0}, |
| {ThreadType::kDisplayCritical, -4}, {ThreadType::kRealtimeAudio, -16}, |
| }; |
| |
| bool CanSetThreadTypeToRealtimeAudio() { |
| return true; |
| } |
| |
| bool SetCurrentThreadTypeForPlatform(ThreadType thread_type, |
| MessagePumpType pump_type_hint) { |
| // We set the Audio priority through JNI as the Java setThreadPriority will |
| // put it into a preferable cgroup, whereas the "normal" C++ call wouldn't. |
| // However, with |
| // https://android-review.googlesource.com/c/platform/system/core/+/1975808 |
| // this becomes obsolete and we can avoid this starting in API level 33. |
| if (thread_type == ThreadType::kRealtimeAudio && |
| base::android::BuildInfo::GetInstance()->sdk_int() < |
| base::android::SDK_VERSION_T) { |
| JNIEnv* env = base::android::AttachCurrentThread(); |
| Java_ThreadUtils_setThreadPriorityAudio(env, |
| PlatformThread::CurrentId().raw()); |
| return true; |
| } |
| // Recent versions of Android (O+) up the priority of the UI thread |
| // automatically. |
| if (thread_type == ThreadType::kDisplayCritical && |
| pump_type_hint == MessagePumpType::UI && |
| GetCurrentThreadNiceValue() <= |
| ThreadTypeToNiceValue(ThreadType::kDisplayCritical)) { |
| return true; |
| } |
| return false; |
| } |
| |
| std::optional<ThreadPriorityForTest> |
| GetCurrentThreadPriorityForPlatformForTest() { |
| JNIEnv* env = base::android::AttachCurrentThread(); |
| if (Java_ThreadUtils_isThreadPriorityAudio( |
| env, PlatformThread::CurrentId().raw())) { |
| return std::make_optional(ThreadPriorityForTest::kRealtimeAudio); |
| } |
| return std::nullopt; |
| } |
| |
| } // namespace internal |
| |
| void PlatformThread::SetName(const std::string& name) { |
| SetNameCommon(name); |
| |
| // Like linux, on android we can get the thread names to show up in the |
| // debugger by setting the process name for the LWP. |
| // We don't want to do this for the main thread because that would rename |
| // the process, causing tools like killall to stop working. |
| if (PlatformThread::CurrentId().raw() == getpid()) { |
| return; |
| } |
| |
| // Set the name for the LWP (which gets truncated to 15 characters). |
| int err = prctl(PR_SET_NAME, name.c_str()); |
| if (err < 0 && errno != EPERM) { |
| DPLOG(ERROR) << "prctl(PR_SET_NAME)"; |
| } |
| } |
| |
| void InitThreading() {} |
| |
| void TerminateOnThread() { |
| base::android::DetachFromVM(); |
| } |
| |
| size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) { |
| #if !defined(ADDRESS_SANITIZER) |
| return 0; |
| #else |
| // AddressSanitizer bloats the stack approximately 2x. Default stack size of |
| // 1Mb is not enough for some tests (see http://crbug.com/263749 for example). |
| return 2 * (1 << 20); // 2Mb |
| #endif |
| } |
| |
| } // namespace base |