1 | #include <iostream>
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2 | #include <boost/thread.hpp>
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3 | #include <boost/thread/shared_mutex.hpp>
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4 | #include <boost/thread/locks.hpp>
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5 |
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6 | using namespace std;
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7 |
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8 | class Test {
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9 | public:
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10 | static Test *Instance();
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11 | virtual ~Test();
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12 |
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13 | private:
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14 | Test();
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15 | static Test *instance;
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16 | static boost::shared_mutex instanceMutex;
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17 | };
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18 |
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19 | Test *Test::instance = NULL;
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20 | boost::shared_mutex Test::instanceMutex;
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21 |
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22 | Test::Test() { };
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23 |
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24 | Test *Test::Instance() {
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25 | boost::upgrade_lock<boost::shared_mutex> lock(instanceMutex);
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26 | if (!instance) {
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27 | boost::upgrade_to_unique_lock<boost::shared_mutex> uniqueLock(lock);
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28 | instance = new Test();
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29 | }
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30 | return instance;
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31 | };
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32 |
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33 | Test::~Test() {
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34 | boost::upgrade_lock<boost::shared_mutex> lock(instanceMutex);
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35 | if (instance) {
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36 | boost::upgrade_to_unique_lock<boost::shared_mutex> uniqueLock(lock);
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37 | instance = NULL;
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38 | }
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39 | };
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40 |
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41 | int main() {
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42 | Test *i = Test::Instance();
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43 | delete i;
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44 |
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45 | return(0);
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46 | }
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