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
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ThreadResponsiveness.h"
#include "platform.h"
#include "nsComponentManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsITimer.h"
#include "mozilla/Monitor.h"
#include "ProfileEntry.h"
#include "ThreadProfile.h"
using mozilla::Monitor;
using mozilla::MonitorAutoLock;
using mozilla::TimeStamp;
class CheckResponsivenessTask : public mozilla::Runnable,
public nsITimerCallback {
public:
CheckResponsivenessTask()
: mLastTracerTime(TimeStamp::Now())
, mMonitor("CheckResponsivenessTask")
, mTimer(nullptr)
, mStop(false)
{
MOZ_COUNT_CTOR(CheckResponsivenessTask);
}
protected:
~CheckResponsivenessTask()
{
MOZ_COUNT_DTOR(CheckResponsivenessTask);
}
public:
NS_IMETHOD Run() override
{
MonitorAutoLock mon(mMonitor);
if (mStop)
return NS_OK;
// This is raced on because we might pause the thread here
// for profiling so if we tried to use a monitor to protect
// mLastTracerTime we could deadlock. We're risking seeing
// a partial write which will show up as an outlier in our
// performance data.
mLastTracerTime = TimeStamp::Now();
if (!mTimer) {
mTimer = do_CreateInstance("@mozilla.org/timer;1");
}
mTimer->InitWithCallback(this, 16, nsITimer::TYPE_ONE_SHOT);
return NS_OK;
}
NS_IMETHOD Notify(nsITimer* aTimer) final
{
NS_DispatchToMainThread(this);
return NS_OK;
}
void Terminate() {
MonitorAutoLock mon(mMonitor);
mStop = true;
}
const TimeStamp& GetLastTracerTime() const {
return mLastTracerTime;
}
NS_DECL_ISUPPORTS_INHERITED
private:
TimeStamp mLastTracerTime;
Monitor mMonitor;
nsCOMPtr<nsITimer> mTimer;
bool mStop;
};
NS_IMPL_ISUPPORTS_INHERITED(CheckResponsivenessTask, mozilla::Runnable,
nsITimerCallback)
ThreadResponsiveness::ThreadResponsiveness(ThreadProfile *aThreadProfile)
: mThreadProfile(aThreadProfile)
, mActiveTracerEvent(nullptr)
{
MOZ_COUNT_CTOR(ThreadResponsiveness);
}
ThreadResponsiveness::~ThreadResponsiveness()
{
MOZ_COUNT_DTOR(ThreadResponsiveness);
if (mActiveTracerEvent) {
mActiveTracerEvent->Terminate();
}
}
void
ThreadResponsiveness::Update()
{
if (!mActiveTracerEvent) {
if (mThreadProfile->GetThreadInfo()->IsMainThread()) {
mActiveTracerEvent = new CheckResponsivenessTask();
NS_DispatchToMainThread(mActiveTracerEvent);
} else if (mThreadProfile->GetThreadInfo()->GetThread()) {
mActiveTracerEvent = new CheckResponsivenessTask();
mThreadProfile->GetThreadInfo()->
GetThread()->Dispatch(mActiveTracerEvent, NS_DISPATCH_NORMAL);
}
}
if (mActiveTracerEvent) {
mLastTracerTime = mActiveTracerEvent->GetLastTracerTime();
}
}
|
