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 // These nice values are taken from Android, which uses nice values like linux,
  27 // but defines some preset nice values.
  28 //   Process.THREAD_PRIORITY_AUDIO = -16
  29 //   Process.THREAD_PRIORITY_BACKGROUND = 10
  30 //   Process.THREAD_PRIORITY_DEFAULT = 0;
  31 //   Process.THREAD_PRIORITY_DISPLAY = -4;
  32 //   Process.THREAD_PRIORITY_FOREGROUND = -2;
  33 //   Process.THREAD_PRIORITY_LESS_FAVORABLE = 1;
  34 //   Process.THREAD_PRIORITY_LOWEST = 19;
  35 //   Process.THREAD_PRIORITY_MORE_FAVORABLE = -1;
  36 //   Process.THREAD_PRIORITY_URGENT_AUDIO = -19;
  37 //   Process.THREAD_PRIORITY_URGENT_DISPLAY = -8;
  38 // We use -6 for display, but we may want to split this into urgent (-8) and
  39 // non-urgent (-4).
  40 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
  41     {kThreadPriority_RealtimeAudio, -16},
  42     {kThreadPriority_Background, 10},
  43     {kThreadPriority_Normal, 0},
  44     {kThreadPriority_Display, -6},
  45 };
  46
  47 bool HandleSetThreadPriorityForPlatform(PlatformThreadHandle handle,
  48                                         ThreadPriority priority) {
  49   // On Android, we set the Audio priority through JNI as Audio priority
  50   // will also allow the process to run while it is backgrounded.
  51   if (priority == kThreadPriority_RealtimeAudio) {
  52     JNIEnv* env = base::android::AttachCurrentThread();
  53     Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
  54     return true;
  55   }
  56   return false;
  57 }
  58
  59 }  // namespace internal
  60
  61 void PlatformThread::SetName(const char* name) {
  62   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
  63   tracked_objects::ThreadData::InitializeThreadContext(name);
  64
  65   // Like linux, on android we can get the thread names to show up in the
  66   // debugger by setting the process name for the LWP.
  67   // We don't want to do this for the main thread because that would rename
  68   // the process, causing tools like killall to stop working.
  69   if (PlatformThread::CurrentId() == getpid())
  70     return;
  71
  72   // Set the name for the LWP (which gets truncated to 15 characters).
  73   int err = prctl(PR_SET_NAME, name);
  74   if (err < 0 && errno != EPERM)
  75     DPLOG(ERROR) << "prctl(PR_SET_NAME)";
  76 }
  77
  78
  79 void InitThreading() {
  80 }
  81
  82 void InitOnThread() {
  83   // Threads on linux/android may inherit their priority from the thread
  84   // where they were created. This sets all new threads to the default.
  85   PlatformThread::SetThreadPriority(PlatformThread::CurrentHandle(),
  86                                     kThreadPriority_Normal);
  87 }
  88
  89 void TerminateOnThread() {
  90   base::android::DetachFromVM();
  91 }
  92
  93 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
  94 #if !defined(ADDRESS_SANITIZER)
  95   return 0;
  96 #else
  97   // AddressSanitizer bloats the stack approximately 2x. Default stack size of
  98   // 1Mb is not enough for some tests (see http://crbug.com/263749 for example).
  99   return 2 * (1 << 20);  // 2Mb
 100 #endif
 101 }
 102
 103 bool RegisterThreadUtils(JNIEnv* env) {
 104   return RegisterNativesImpl(env);
 105 }
 106
 107 }  // namespace base