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a simple thread example to show thread-safe vector operation
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#include <iostream> | |
#include <concurrent_vector.h> | |
#include <thread> | |
#include <algorithm> | |
#include <cstdlib> | |
#include <atomic> | |
#include <vector> | |
#include <mutex> | |
int counter = 0; | |
std::vector<int> vec; | |
// mutex to lock critical region | |
std::mutex mylock; | |
void push2vector() { | |
try { | |
for (int i = 0; i < 1000000; i++){ | |
// increment here will generate repeated values in the vector | |
//counter++; | |
mylock.lock(); | |
// increment here is thread safe | |
counter++; | |
// push back to the vector when the mutex is locked | |
// using the concurrent vector has the same effect | |
vec.push_back(counter); | |
mylock.unlock(); | |
} | |
} | |
catch (std::exception e) { | |
std::cout << "counter = " << counter << std::endl; | |
std::cerr << e.what() << std::endl; | |
} | |
} | |
int main() { | |
for (int i = 0; i < 10; i++) { | |
counter = 0; | |
vec.clear(); | |
std::thread t1(push2vector); | |
std::thread t2(push2vector); | |
t1.join(); | |
t2.join(); | |
std::sort(vec.begin(), vec.end()); | |
bool repeated = false; | |
for (int j = 0; j < vec.size() - 1; j++) { | |
repeated |= (vec[j] == vec[j + 1]); | |
} | |
std::cout << (repeated ? "repeat" : "no repeat") << std::endl; | |
/* | |
std::for_each(vec.begin(), vec.end(), [](int x){ | |
std::cout << x << std::endl; | |
}); | |
*/ | |
system("pause"); | |
} | |
return 0; | |
} |
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