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
148
149
150
151
152
153
154
155
156
|
// 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/renderer/pepper/pepper_hung_plugin_filter.h"
#include "base/bind.h"
#include "content/child/child_process.h"
#include "content/common/frame_messages.h"
#include "content/renderer/render_thread_impl.h"
namespace content {
namespace {
// We'll consider the plugin hung after not hearing anything for this long.
const int kHungThresholdSec = 10;
// If we ever are blocked for this long, we'll consider the plugin hung, even
// if we continue to get messages (which is why the above hung threshold never
// kicked in). Maybe the plugin is spamming us with events and never unblocking
// and never processing our sync message.
const int kBlockedHardThresholdSec = kHungThresholdSec * 1.5;
} // namespace
PepperHungPluginFilter::PepperHungPluginFilter(
const base::FilePath& plugin_path,
int frame_routing_id,
int plugin_child_id)
: plugin_path_(plugin_path),
frame_routing_id_(frame_routing_id),
plugin_child_id_(plugin_child_id),
filter_(RenderThread::Get()->GetSyncMessageFilter()),
io_task_runner_(ChildProcess::current()->io_task_runner()),
pending_sync_message_count_(0),
hung_plugin_showing_(false),
timer_task_pending_(false) {
}
void PepperHungPluginFilter::BeginBlockOnSyncMessage() {
base::AutoLock lock(lock_);
last_message_received_ = base::TimeTicks::Now();
if (pending_sync_message_count_ == 0)
began_blocking_time_ = last_message_received_;
pending_sync_message_count_++;
EnsureTimerScheduled();
}
void PepperHungPluginFilter::EndBlockOnSyncMessage() {
base::AutoLock lock(lock_);
pending_sync_message_count_--;
DCHECK(pending_sync_message_count_ >= 0);
MayHaveBecomeUnhung();
}
void PepperHungPluginFilter::OnFilterRemoved() {
base::AutoLock lock(lock_);
MayHaveBecomeUnhung();
}
void PepperHungPluginFilter::OnChannelError() {
base::AutoLock lock(lock_);
MayHaveBecomeUnhung();
}
bool PepperHungPluginFilter::OnMessageReceived(const IPC::Message& message) {
// Just track incoming message times but don't handle any messages.
base::AutoLock lock(lock_);
last_message_received_ = base::TimeTicks::Now();
MayHaveBecomeUnhung();
return false;
}
PepperHungPluginFilter::~PepperHungPluginFilter() {}
void PepperHungPluginFilter::EnsureTimerScheduled() {
lock_.AssertAcquired();
if (timer_task_pending_)
return;
timer_task_pending_ = true;
io_task_runner_->PostDelayedTask(
FROM_HERE, base::BindOnce(&PepperHungPluginFilter::OnHangTimer, this),
base::TimeDelta::FromSeconds(kHungThresholdSec));
}
void PepperHungPluginFilter::MayHaveBecomeUnhung() {
lock_.AssertAcquired();
if (!hung_plugin_showing_ || IsHung())
return;
SendHungMessage(false);
hung_plugin_showing_ = false;
}
base::TimeTicks PepperHungPluginFilter::GetHungTime() const {
lock_.AssertAcquired();
DCHECK(pending_sync_message_count_);
DCHECK(!began_blocking_time_.is_null());
DCHECK(!last_message_received_.is_null());
// Always considered hung at the hard threshold.
base::TimeTicks hard_time =
began_blocking_time_ +
base::TimeDelta::FromSeconds(kBlockedHardThresholdSec);
// Hung after a soft threshold from last message of any sort.
base::TimeTicks soft_time =
last_message_received_ + base::TimeDelta::FromSeconds(kHungThresholdSec);
return std::min(soft_time, hard_time);
}
bool PepperHungPluginFilter::IsHung() const {
lock_.AssertAcquired();
if (!pending_sync_message_count_)
return false; // Not blocked on a sync message.
return base::TimeTicks::Now() > GetHungTime();
}
void PepperHungPluginFilter::OnHangTimer() {
base::AutoLock lock(lock_);
timer_task_pending_ = false;
if (!pending_sync_message_count_)
return; // Not blocked any longer.
base::TimeDelta delay = GetHungTime() - base::TimeTicks::Now();
if (delay > base::TimeDelta()) {
// Got a timer message while we're waiting on a sync message. We need
// to schedule another timer message because the latest sync message
// would not have scheduled one (we only have one out-standing timer at
// a time).
timer_task_pending_ = true;
io_task_runner_->PostDelayedTask(
FROM_HERE, base::BindOnce(&PepperHungPluginFilter::OnHangTimer, this),
delay);
return;
}
hung_plugin_showing_ = true;
SendHungMessage(true);
}
void PepperHungPluginFilter::SendHungMessage(bool is_hung) {
filter_->Send(new FrameHostMsg_PepperPluginHung(
frame_routing_id_, plugin_child_id_, plugin_path_, is_hung));
}
} // namespace content
|
