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 SetCurrentThreadPriorityForPlatform(ThreadPriority priority) {
  41   // On Android, we set the Audio priority through JNI as Audio priority
  42   // will also allow the process to run while it is backgrounded.
  43   if (priority == ThreadPriority::REALTIME_AUDIO) {
  44     JNIEnv* env = base::android::AttachCurrentThread();
  45     Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
  46     return true;
  47   }
  48   return false;
  49 }
  50
  51 bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority) {
  52   // See http://crbug.com/505474.
  53   NOTIMPLEMENTED();
  54   return false;
  55 }
  56
  57 }  // namespace internal
  58
  59 void PlatformThread::SetName(const std::string& name) {
  60   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
  61   tracked_objects::ThreadData::InitializeThreadContext(name);
  62
  63   // Like linux, on android we can get the thread names to show up in the
  64   // debugger by setting the process name for the LWP.
  65   // We don't want to do this for the main thread because that would rename
  66   // the process, causing tools like killall to stop working.
  67   if (PlatformThread::CurrentId() == getpid())
  68     return;
  69
  70   // Set the name for the LWP (which gets truncated to 15 characters).
  71   int err = prctl(PR_SET_NAME, name.c_str());
  72   if (err < 0 && errno != EPERM)
  73     DPLOG(ERROR) << "prctl(PR_SET_NAME)";
  74 }
  75
  76
  77 void InitThreading() {
  78 }
  79
  80 void InitOnThread() {
  81   // Threads on linux/android may inherit their priority from the thread
  82   // where they were created. This sets all new threads to the default.
  83   PlatformThread::SetCurrentThreadPriority(ThreadPriority::NORMAL);
  84 }
  85
  86 void TerminateOnThread() {
  87   base::android::DetachFromVM();
  88 }
  89
  90 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
  91 #if !defined(ADDRESS_SANITIZER)
  92   return 0;
  93 #else
  94   // AddressSanitizer bloats the stack approximately 2x. Default stack size of
  95   // 1Mb is not enough for some tests (see http://crbug.com/263749 for example).
  96   return 2 * (1 << 20);  // 2Mb
  97 #endif
  98 }
  99
 100 bool RegisterThreadUtils(JNIEnv* env) {
 101   return RegisterNativesImpl(env);
 102 }
 103
 104 }  // namespace base