base/threading/platform_thread_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/threading/platform_thread.h"
   6
   7 #include <errno.h>
   8 #include <sys/prctl.h>
   9 #include <sys/resource.h>
  10 #include <sys/types.h>
  11 #include <unistd.h>
  12
  13 #include "base/android/jni_android.h"
  14 #include "base/android/thread_utils.h"
  15 #include "base/lazy_instance.h"
  16 #include "base/logging.h"
  17 #include "base/threading/platform_thread_internal_posix.h"
  18 #include "base/threading/thread_id_name_manager.h"
  19 #include "base/tracked_objects.h"
  20 #include "jni/ThreadUtils_jni.h"
  21
  22 namespace base {
  23
  24 namespace internal {
  25
  26 // - BACKGROUND is 9 due to it being the nicest value we can use that's still
  27 // above an Android system threshold that enables heavy throttling starting at
  28 // 10; we want to be lower-priority than Chrome's other threads without
  29 // incurring this behavior.
  30 // - DISPLAY is -6 due to being midway between Android's DISPLAY (-4) and
  31 // URGENT_DISPLAY (-8).
  32 // - REALTIME_AUDIO corresponds to Android's THREAD_PRIORITY_AUDIO = -16 value.
  33 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
  34     {ThreadPriority::BACKGROUND, 9},
  35     {ThreadPriority::NORMAL, 0},
  36     {ThreadPriority::DISPLAY, -6},
  37     {ThreadPriority::REALTIME_AUDIO, -16},
  38 };
  39
  40 bool SetThreadPriorityForPlatform(PlatformThreadHandle handle,
  41                                   ThreadPriority priority) {
  42   // On Android, we set the Audio priority through JNI as Audio priority
  43   // will also allow the process to run while it is backgrounded.
  44   if (priority == ThreadPriority::REALTIME_AUDIO) {
  45     JNIEnv* env = base::android::AttachCurrentThread();
  46     Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
  47     return true;
  48   }
  49   return false;
  50 }
  51
  52 bool GetThreadPriorityForPlatform(PlatformThreadHandle handle,
  53                                   ThreadPriority* priority) {
  54   NOTIMPLEMENTED();
  55   return false;
  56 }
  57
  58 }  // namespace internal
  59
  60 void PlatformThread::SetName(const std::string& name) {
  61   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
  62   tracked_objects::ThreadData::InitializeThreadContext(name);
  63
  64   // Like linux, on android we can get the thread names to show up in the
  65   // debugger by setting the process name for the LWP.
  66   // We don't want to do this for the main thread because that would rename
  67   // the process, causing tools like killall to stop working.
  68   if (PlatformThread::CurrentId() == getpid())
  69     return;
  70
  71   // Set the name for the LWP (which gets truncated to 15 characters).
  72   int err = prctl(PR_SET_NAME, name.c_str());
  73   if (err < 0 && errno != EPERM)
  74     DPLOG(ERROR) << "prctl(PR_SET_NAME)";
  75 }
  76
  77
  78 void InitThreading() {
  79 }
  80
  81 void InitOnThread() {
  82   // Threads on linux/android may inherit their priority from the thread
  83   // where they were created. This sets all new threads to the default.
  84   PlatformThread::SetThreadPriority(PlatformThread::CurrentHandle(),
  85                                     ThreadPriority::NORMAL);
  86 }
  87
  88 void TerminateOnThread() {
  89   base::android::DetachFromVM();
  90 }
  91
  92 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
  93 #if !defined(ADDRESS_SANITIZER)
  94   return 0;
  95 #else
  96   // AddressSanitizer bloats the stack approximately 2x. Default stack size of
  97   // 1Mb is not enough for some tests (see http://crbug.com/263749 for example).
  98   return 2 * (1 << 20);  // 2Mb
  99 #endif
 100 }
 101
 102 bool RegisterThreadUtils(JNIEnv* env) {
 103   return RegisterNativesImpl(env);
 104 }
 105
 106 }  // namespace base