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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/child/child_process.h"
#if defined(OS_POSIX) && !defined(OS_ANDROID)
#include <signal.h> // For SigUSR1Handler below.
#endif
#include "base/lazy_instance.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/statistics_recorder.h"
#include "base/process/process_handle.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread.h"
#include "base/threading/thread_local.h"
#include "content/child/child_thread.h"
#if defined(OS_ANDROID)
#include "base/debug/debugger.h"
#endif
#if defined(OS_POSIX) && !defined(OS_ANDROID)
static void SigUSR1Handler(int signal) { }
#endif
namespace content {
namespace {
base::LazyInstance<base::ThreadLocalPointer<ChildProcess> > g_lazy_tls =
LAZY_INSTANCE_INITIALIZER;
}
ChildProcess::ChildProcess()
: ref_count_(0),
shutdown_event_(true, false),
io_thread_("Chrome_ChildIOThread") {
DCHECK(!g_lazy_tls.Pointer()->Get());
g_lazy_tls.Pointer()->Set(this);
base::StatisticsRecorder::Initialize();
// We can't recover from failing to start the IO thread.
CHECK(io_thread_.StartWithOptions(
base::Thread::Options(base::MessageLoop::TYPE_IO, 0)));
#if defined(OS_ANDROID)
io_thread_.SetPriority(base::kThreadPriority_Display);
#endif
}
ChildProcess::~ChildProcess() {
DCHECK(g_lazy_tls.Pointer()->Get() == this);
// Signal this event before destroying the child process. That way all
// background threads can cleanup.
// For example, in the renderer the RenderThread instances will be able to
// notice shutdown before the render process begins waiting for them to exit.
shutdown_event_.Signal();
// Kill the main thread object before nulling child_process, since
// destruction code might depend on it.
if (main_thread_) { // null in unittests.
main_thread_->Shutdown();
main_thread_.reset();
}
g_lazy_tls.Pointer()->Set(NULL);
io_thread_.Stop();
}
ChildThread* ChildProcess::main_thread() {
return main_thread_.get();
}
void ChildProcess::set_main_thread(ChildThread* thread) {
main_thread_.reset(thread);
}
void ChildProcess::AddRefProcess() {
DCHECK(!main_thread_.get() || // null in unittests.
base::MessageLoop::current() == main_thread_->message_loop());
ref_count_++;
}
void ChildProcess::ReleaseProcess() {
DCHECK(!main_thread_.get() || // null in unittests.
base::MessageLoop::current() == main_thread_->message_loop());
DCHECK(ref_count_);
if (--ref_count_)
return;
if (main_thread_) // null in unittests.
main_thread_->OnProcessFinalRelease();
}
ChildProcess* ChildProcess::current() {
return g_lazy_tls.Pointer()->Get();
}
base::WaitableEvent* ChildProcess::GetShutDownEvent() {
return &shutdown_event_;
}
void ChildProcess::WaitForDebugger(const std::string& label) {
#if defined(OS_WIN)
#if defined(GOOGLE_CHROME_BUILD)
std::string title = "Google Chrome";
#else // CHROMIUM_BUILD
std::string title = "Chromium";
#endif // CHROMIUM_BUILD
title += " ";
title += label; // makes attaching to process easier
std::string message = label;
message += " starting with pid: ";
message += base::IntToString(base::GetCurrentProcId());
::MessageBox(NULL, base::UTF8ToWide(message).c_str(),
base::UTF8ToWide(title).c_str(),
MB_OK | MB_SETFOREGROUND);
#elif defined(OS_POSIX)
#if defined(OS_ANDROID)
LOG(ERROR) << label << " waiting for GDB.";
// Wait 24 hours for a debugger to be attached to the current process.
base::debug::WaitForDebugger(24 * 60 * 60, false);
#else
// TODO(playmobil): In the long term, overriding this flag doesn't seem
// right, either use our own flag or open a dialog we can use.
// This is just to ease debugging in the interim.
LOG(ERROR) << label
<< " ("
<< getpid()
<< ") paused waiting for debugger to attach. "
<< "Send SIGUSR1 to unpause.";
// Install a signal handler so that pause can be woken.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SigUSR1Handler;
sigaction(SIGUSR1, &sa, NULL);
pause();
#endif // defined(OS_ANDROID)
#endif // defined(OS_POSIX)
}
} // namespace content
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