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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 <sys/prctl.h>
#include <sys/resource.h>
#include "base/android/jni_android.h"
#include "base/android/thread_utils.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/threading/thread_id_name_manager.h"
#include "base/tracked_objects.h"
#include "jni/ThreadUtils_jni.h"
namespace base {
namespace {
int ThreadNiceValue(ThreadPriority priority) {
// These nice values are taken from Android, which uses nice
// values like linux, but defines some preset nice values.
// Process.THREAD_PRIORITY_AUDIO = -16
// Process.THREAD_PRIORITY_BACKGROUND = 10
// Process.THREAD_PRIORITY_DEFAULT = 0;
// Process.THREAD_PRIORITY_DISPLAY = -4;
// Process.THREAD_PRIORITY_FOREGROUND = -2;
// Process.THREAD_PRIORITY_LESS_FAVORABLE = 1;
// Process.THREAD_PRIORITY_LOWEST = 19;
// Process.THREAD_PRIORITY_MORE_FAVORABLE = -1;
// Process.THREAD_PRIORITY_URGENT_AUDIO = -19;
// Process.THREAD_PRIORITY_URGENT_DISPLAY = -8;
// We use -6 for display, but we may want to split this
// into urgent (-8) and non-urgent (-4).
static const int threadPriorityAudio = -16;
static const int threadPriorityBackground = 10;
static const int threadPriorityDefault = 0;
static const int threadPriorityDisplay = -6;
switch (priority) {
case kThreadPriority_RealtimeAudio:
return threadPriorityAudio;
case kThreadPriority_Background:
return threadPriorityBackground;
case kThreadPriority_Normal:
return threadPriorityDefault;
case kThreadPriority_Display:
return threadPriorityDisplay;
default:
NOTREACHED() << "Unknown priority.";
return 0;
}
}
} // namespace
//static
void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
ThreadPriority priority) {
// On Android, we set the Audio priority through JNI as Audio priority
// will also allow the process to run while it is backgrounded.
if (priority == kThreadPriority_RealtimeAudio) {
JNIEnv* env = base::android::AttachCurrentThread();
Java_ThreadUtils_setThreadPriorityAudio(env, PlatformThread::CurrentId());
return;
}
// setpriority(2) should change the whole thread group's (i.e. process)
// priority. however, on linux it will only change the target thread's
// priority. see the bugs section in
// http://man7.org/linux/man-pages/man2/getpriority.2.html.
// we prefer using 0 rather than the current thread id since they are
// equivalent but it makes sandboxing easier (https://crbug.com/399473).
DCHECK_NE(handle.id_, kInvalidThreadId);
int kNiceSetting = ThreadNiceValue(priority);
const PlatformThreadId current_id = PlatformThread::CurrentId();
if (setpriority(PRIO_PROCESS,
handle.id_ == current_id ? 0 : handle.id_,
kNiceSetting)) {
LOG(ERROR) << "Failed to set nice value of thread to " << kNiceSetting;
}
}
void PlatformThread::SetName(const char* name) {
ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
tracked_objects::ThreadData::InitializeThreadContext(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() == getpid())
return;
// Set the name for the LWP (which gets truncated to 15 characters).
int err = prctl(PR_SET_NAME, name);
if (err < 0 && errno != EPERM)
DPLOG(ERROR) << "prctl(PR_SET_NAME)";
}
void InitThreading() {
}
void InitOnThread() {
// Threads on linux/android may inherit their priority from the thread
// where they were created. This sets all new threads to the default.
PlatformThread::SetThreadPriority(PlatformThread::CurrentHandle(),
kThreadPriority_Normal);
}
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
}
bool RegisterThreadUtils(JNIEnv* env) {
return RegisterNativesImpl(env);
}
} // namespace base
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