1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
// 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_impl.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.
base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
#if defined(OS_ANDROID)
thread_options.priority = base::ThreadPriority::DISPLAY;
#endif
CHECK(io_thread_.StartWithOptions(thread_options));
}
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();
}
ChildThreadImpl* ChildProcess::main_thread() {
return main_thread_.get();
}
void ChildProcess::set_main_thread(ChildThreadImpl* 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
|
