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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 "content/browser/browser_process_sub_thread.h"
#include "base/bind.h"
#include "base/clang_profiling_buildflags.h"
#include "base/compiler_specific.h"
#include "base/debug/alias.h"
#include "base/metrics/histogram_macros.h"
#include "base/threading/hang_watcher.h"
#include "base/threading/thread_restrictions.h"
#include "base/trace_event/memory_dump_manager.h"
#include "content/browser/browser_child_process_host_impl.h"
#include "content/browser/browser_thread_impl.h"
#include "content/browser/notification_service_impl.h"
#include "content/browser/utility_process_host.h"
#include "content/common/child_process_host_impl.h"
#include "content/public/browser/browser_child_process_host_iterator.h"
#include "content/public/common/process_type.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request.h"
#if defined(OS_ANDROID)
#include "base/android/jni_android.h"
#endif
#if defined(OS_WIN)
#include "base/win/scoped_com_initializer.h"
#endif
namespace content {
BrowserProcessSubThread::BrowserProcessSubThread(BrowserThread::ID identifier)
: base::Thread(BrowserThreadImpl::GetThreadName(identifier)),
identifier_(identifier) {
// Not bound to creation thread.
DETACH_FROM_THREAD(browser_thread_checker_);
}
BrowserProcessSubThread::~BrowserProcessSubThread() {
Stop();
}
void BrowserProcessSubThread::RegisterAsBrowserThread() {
DCHECK(IsRunning());
DCHECK(!browser_thread_);
browser_thread_.reset(new BrowserThreadImpl(identifier_, task_runner()));
// Unretained(this) is safe as |this| outlives its underlying thread.
task_runner()->PostTask(
FROM_HERE,
base::BindOnce(
&BrowserProcessSubThread::CompleteInitializationOnBrowserThread,
Unretained(this)));
}
void BrowserProcessSubThread::AllowBlockingForTesting() {
DCHECK(!IsRunning());
is_blocking_allowed_for_testing_ = true;
}
void BrowserProcessSubThread::Init() {
DCHECK_CALLED_ON_VALID_THREAD(browser_thread_checker_);
#if defined(OS_WIN)
com_initializer_ = std::make_unique<base::win::ScopedCOMInitializer>();
#endif
if (!is_blocking_allowed_for_testing_) {
base::DisallowUnresponsiveTasks();
}
}
void BrowserProcessSubThread::Run(base::RunLoop* run_loop) {
DCHECK_CALLED_ON_VALID_THREAD(browser_thread_checker_);
#if defined(OS_ANDROID)
// Not to reset thread name to "Thread-???" by VM, attach VM with thread name.
// Though it may create unnecessary VM thread objects, keeping thread name
// gives more benefit in debugging in the platform.
if (!thread_name().empty()) {
base::android::AttachCurrentThreadWithName(thread_name());
}
#endif
switch (identifier_) {
case BrowserThread::UI:
// The main thread is usually promoted as the UI thread and doesn't go
// through Run() but some tests do run a separate UI thread.
UIThreadRun(run_loop);
break;
case BrowserThread::IO:
IOThreadRun(run_loop);
return;
case BrowserThread::ID_COUNT:
NOTREACHED();
break;
}
}
void BrowserProcessSubThread::CleanUp() {
DCHECK_CALLED_ON_VALID_THREAD(browser_thread_checker_);
// Run extra cleanup if this thread represents BrowserThread::IO.
if (BrowserThread::CurrentlyOn(BrowserThread::IO))
IOThreadCleanUp();
notification_service_.reset();
#if defined(OS_WIN)
com_initializer_.reset();
#endif
}
void BrowserProcessSubThread::CompleteInitializationOnBrowserThread() {
DCHECK_CALLED_ON_VALID_THREAD(browser_thread_checker_);
notification_service_ = std::make_unique<NotificationServiceImpl>();
}
// Mark following two functions as NOINLINE so the compiler doesn't merge
// them together.
NOINLINE void BrowserProcessSubThread::UIThreadRun(base::RunLoop* run_loop) {
Thread::Run(run_loop);
// Inhibit tail calls of Run and inhibit code folding.
const int line_number = __LINE__;
base::debug::Alias(&line_number);
}
NOINLINE void BrowserProcessSubThread::IOThreadRun(base::RunLoop* run_loop) {
// Register the IO thread for hang watching before it starts running and set
// up a closure to automatically unregister it when Run() returns.
base::ScopedClosureRunner unregister_thread_closure;
if (base::FeatureList::IsEnabled(base::HangWatcher::kEnableHangWatcher)) {
unregister_thread_closure =
base::HangWatcher::GetInstance()->RegisterThread();
}
Thread::Run(run_loop);
// Inhibit tail calls of Run and inhibit code folding.
const int line_number = __LINE__;
base::debug::Alias(&line_number);
}
void BrowserProcessSubThread::IOThreadCleanUp() {
DCHECK_CALLED_ON_VALID_THREAD(browser_thread_checker_);
// Kill all things that might be holding onto
// net::URLRequest/net::URLRequestContexts.
// Destroy all URLRequests started by URLFetchers.
net::URLFetcher::CancelAll();
for (BrowserChildProcessHostIterator it(PROCESS_TYPE_UTILITY); !it.Done();
++it) {
UtilityProcessHost* utility_process =
static_cast<UtilityProcessHost*>(it.GetDelegate());
if (utility_process->sandbox_type() ==
service_manager::SandboxType::kNetwork) {
// This ensures that cookies and cache are flushed to disk on shutdown.
// https://crbug.com/841001
#if BUILDFLAG(CLANG_PROFILING)
// On profiling build, browser_tests runs 10x slower.
const int kMaxSecondsToWaitForNetworkProcess = 100;
#elif defined(OS_CHROMEOS)
// ChromeOS will kill the browser process if it doesn't shut down within
// 3 seconds, so make sure we wait for less than that.
const int kMaxSecondsToWaitForNetworkProcess = 1;
#else
const int kMaxSecondsToWaitForNetworkProcess = 10;
#endif
ChildProcessHostImpl* child_process =
static_cast<ChildProcessHostImpl*>(it.GetHost());
auto& process = child_process->peer_process();
if (!process.IsValid())
continue;
base::ScopedAllowBaseSyncPrimitives scoped_allow_base_sync_primitives;
const base::TimeTicks start_time = base::TimeTicks::Now();
process.WaitForExitWithTimeout(
base::TimeDelta::FromSeconds(kMaxSecondsToWaitForNetworkProcess),
nullptr);
// Record time spent for the method call.
base::TimeDelta network_wait_time = base::TimeTicks::Now() - start_time;
UMA_HISTOGRAM_TIMES("NetworkService.ShutdownTime", network_wait_time);
DVLOG(1) << "Waited " << network_wait_time.InMilliseconds()
<< " ms for network service";
}
}
// If any child processes are still running, terminate them and
// and delete the BrowserChildProcessHost instances to release whatever
// IO thread only resources they are referencing.
BrowserChildProcessHostImpl::TerminateAll();
}
} // namespace content
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