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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
// DeadlockDetect.cpp
// Declares the cDeadlockDetect class that tries to detect deadlocks and aborts the server when it detects one
#include "Globals.h"
#include "DeadlockDetect.h"
#include "Root.h"
#include "World.h"
#include <cstdlib>
/** Number of milliseconds per cycle */
const int CYCLE_MILLISECONDS = 100;
cDeadlockDetect::cDeadlockDetect(void) :
Super("Deadlock Detector"),
m_IntervalSec(1000)
{
}
cDeadlockDetect::~cDeadlockDetect()
{
// Check that all tracked CSs have been removed, report any remaining:
cCSLock lock(m_CS);
if (!m_TrackedCriticalSections.empty())
{
LOGWARNING("DeadlockDetect: Some CS objects (%u) haven't been removed from tracking", static_cast<unsigned>(m_TrackedCriticalSections.size()));
for (const auto & tcs: m_TrackedCriticalSections)
{
LOGWARNING(" CS %p / %s",
static_cast<void *>(tcs.first),
tcs.second.c_str()
);
}
}
}
void cDeadlockDetect::Start(int a_IntervalSec)
{
m_IntervalSec = a_IntervalSec;
// Read the initial world data:
cRoot::Get()->ForEachWorld([=](cWorld & a_World)
{
SetWorldAge(a_World.GetName(), a_World.GetWorldAge());
return false;
});
Super::Start();
}
void cDeadlockDetect::TrackCriticalSection(cCriticalSection & a_CS, const AString & a_Name)
{
cCSLock lock(m_CS);
m_TrackedCriticalSections.emplace_back(&a_CS, a_Name);
}
void cDeadlockDetect::UntrackCriticalSection(cCriticalSection & a_CS)
{
cCSLock lock(m_CS);
for (auto itr = m_TrackedCriticalSections.begin(), end = m_TrackedCriticalSections.end(); itr != end; ++itr)
{
if (itr->first == &a_CS)
{
m_TrackedCriticalSections.erase(itr);
return;
}
}
}
void cDeadlockDetect::Execute(void)
{
// Loop until the signal to terminate:
while (!m_ShouldTerminate)
{
// Check the world ages:
cRoot::Get()->ForEachWorld([=](cWorld & a_World)
{
CheckWorldAge(a_World.GetName(), a_World.GetWorldAge());
return false;
});
std::this_thread::sleep_for(std::chrono::milliseconds(CYCLE_MILLISECONDS));
} // while (should run)
}
void cDeadlockDetect::SetWorldAge(const AString & a_WorldName, const cTickTimeLong a_Age)
{
m_WorldAges[a_WorldName].m_Age = a_Age;
m_WorldAges[a_WorldName].m_NumCyclesSame = 0;
}
void cDeadlockDetect::CheckWorldAge(const AString & a_WorldName, const cTickTimeLong a_Age)
{
WorldAges::iterator itr = m_WorldAges.find(a_WorldName);
if (itr == m_WorldAges.end())
{
SetWorldAge(a_WorldName, a_Age);
return;
}
cDeadlockDetect::sWorldAge & WorldAge = itr->second;
if (WorldAge.m_Age == a_Age)
{
WorldAge.m_NumCyclesSame += 1;
if (WorldAge.m_NumCyclesSame > (m_IntervalSec * 1000) / CYCLE_MILLISECONDS)
{
DeadlockDetected(a_WorldName, a_Age);
}
}
else
{
WorldAge.m_Age = a_Age;
WorldAge.m_NumCyclesSame = 0;
}
}
void cDeadlockDetect::DeadlockDetected(const AString & a_WorldName, const cTickTimeLong a_WorldAge)
{
LOGERROR("Deadlock detected: world %s has been stuck at age %lld. Aborting the server.",
a_WorldName.c_str(), static_cast<long long>(a_WorldAge.count())
);
ListTrackedCSs();
ASSERT(!"Deadlock detected");
std::abort();
}
void cDeadlockDetect::ListTrackedCSs(void)
{
cCSLock lock(m_CS);
for (const auto & cs: m_TrackedCriticalSections)
{
LOG("CS at %p, %s: RecursionCount = %d, ThreadIDHash = %04llx",
static_cast<void *>(cs.first), cs.second.c_str(),
cs.first->m_RecursionCount, static_cast<UInt64>(std::hash<std::thread::id>()(cs.first->m_OwningThreadID))
);
}
}
|
