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
|
// spin_lock_test.cpp : spin_lcok.{h, cpp} unit test
/**
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include <boost/thread/thread.hpp>
#include "dbtests.h"
#include "../util/concurrency/spin_lock.h"
#include "../util/timer.h"
namespace {
using mongo::SpinLock;
class LockTester {
public:
LockTester( SpinLock* spin, int* counter )
: _spin(spin), _counter(counter), _requests(0) {}
~LockTester() {
delete _t;
}
void start( int increments ) {
_t = new boost::thread( boost::bind(&LockTester::test, this, increments) );
}
void join() {
if ( _t ) _t->join();
}
int requests() const {
return _requests;
}
private:
SpinLock* _spin; // not owned here
int* _counter; // not owned here
int _requests;
boost::thread* _t;
void test( int increments ) {
while ( increments-- > 0 ) {
_spin->lock();
++(*_counter);
++_requests;
_spin->unlock();
}
}
LockTester( LockTester& );
LockTester& operator=( LockTester& );
};
class ConcurrentIncs {
public:
void run() {
SpinLock spin;
int counter = 0;
const int threads = 64;
const int incs = 50000;
LockTester* testers[threads];
Timer timer;
for ( int i = 0; i < threads; i++ ) {
testers[i] = new LockTester( &spin, &counter );
}
for ( int i = 0; i < threads; i++ ) {
testers[i]->start( incs );
}
for ( int i = 0; i < threads; i++ ) {
testers[i]->join();
ASSERT_EQUALS( testers[i]->requests(), incs );
delete testers[i];
}
int ms = timer.millis();
log() << "spinlock ConcurrentIncs time: " << ms << endl;
ASSERT_EQUALS( counter, threads*incs );
#if defined(__linux__)
ASSERT( SpinLock::isfast() );
#endif
}
};
class SpinLockSuite : public Suite {
public:
SpinLockSuite() : Suite( "spinlock" ) {}
void setupTests() {
add< ConcurrentIncs >();
}
} spinLockSuite;
} // anonymous namespace
|