#include <iostream>
#include <unordered_set>
#include <thread>
#include <mutex>
#include <vector>
#include <random>
std::unordered_set<int> sharedSet;
std::mutex setMutex;
void insertRandomNumbers(int count) {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<> dis(1, 100);
for (int i = 0; i < count; ++i) {
int num = dis(gen);
{
std::lock_guard<std::mutex> lock(setMutex);
sharedSet.insert(num);
}
std::cout << "Inserted: " << num << std::endl;
}
}
void readSharedSet() {
std::this_thread::sleep_for(std::chrono::seconds(1)); // Wait for some elements to be inserted
while (true) {
std::unordered_set<int> copySet = sharedSet; // Copy the set to read
for (int num : copySet) {
std::cout << "Thread " << std::this_thread::get_id() << " read: " << num << std::endl;
}
std::this_thread::sleep_for(std::chrono::milliseconds(500));
}
}
int main() {
std::thread writer(insertRandomNumbers, 20);
std::thread reader1(readSharedSet);
std::thread reader2(readSharedSet);
writer.join();
reader1.detach(); // Detach to keep running
reader2.detach(); // Detach to keep running
std::this_thread::sleep_for(std::chrono::seconds(10)); // Let readers run for a while
std::cout << "Main thread finished." << std::endl;
return 0;
}
输出
[?2004l
Inserted: 4
Inserted: 35
Inserted: 75
Inserted: 26
Inserted: 73
Inserted: 27
Inserted: 33
Inserted: 94
Inserted: 70
Inserted: 25
Inserted: 12
Inserted: 41
Inserted: 62
Inserted: 58
Inserted: 86
Inserted: 61
Inserted: 97
Inserted: 9
Inserted: 84
Inserted: 61
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread Thread 123711848236608 read: 94123711839843904
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
read: Thread 9123711848236608 read: 12
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 41
Thread Thread 123711848236608 read: 123711839843904 read: 99
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read:
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
4Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread Thread 123711839843904 read: 12371184823660894 read:
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
123711848236608Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
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Thread 123711839843904 read: 26
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Thread 123711839843904 read: 62
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Thread 123711839843904 read: 94
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Thread 123711839843904 read: 70
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Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
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Thread 123711848236608 read: 94
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Thread 123711839843904 read: 97
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Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
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Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
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Thread 123711839843904 read: 97
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Thread 123711839843904 read: 94
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Thread 123711839843904 read: 70
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Thread 123711848236608 read: 97
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Thread 123711848236608 read: 94
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Thread 123711848236608 read: 70
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Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
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Thread 123711839843904 read: 94
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Thread 123711848236608 read: 97
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Thread 123711848236608 read: 94
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Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
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Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
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Thread 123711848236608 read: 86
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Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
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Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
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Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
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Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
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Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
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Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
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Thread 123711839843904 read: 94
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Thread 123711839843904 read: 97
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Thread 123711839843904 read: 94
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Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
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Thread 123711848236608 read: 94
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Thread 123711839843904 read: 94
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Thread 123711839843904 read: 70
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Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
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Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
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Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
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Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
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Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Thread 123711839843904 read: 9
Thread 123711839843904 read: 97
Thread 123711839843904 read: 61
Thread 123711839843904 read: 86
Thread 123711839843904 read: 58
Thread 123711839843904 read: 35
Thread 123711839843904 read: 75
Thread 123711839843904 read: 84
Thread 123711839843904 read: 26
Thread 123711839843904 read: 73
Thread 123711839843904 read: 27
Thread 123711839843904 read: 4
Thread 123711839843904 read: 62
Thread 123711839843904 read: 33
Thread 123711839843904 read: 94
Thread 123711839843904 read: 25
Thread 123711839843904 read: 70
Thread 123711839843904 read: 12
Thread 123711839843904 read: 41
Thread 123711848236608 read: 9
Thread 123711848236608 read: 97
Thread 123711848236608 read: 61
Thread 123711848236608 read: 86
Thread 123711848236608 read: 58
Thread 123711848236608 read: 35
Thread 123711848236608 read: 75
Thread 123711848236608 read: 84
Thread 123711848236608 read: 26
Thread 123711848236608 read: 73
Thread 123711848236608 read: 27
Thread 123711848236608 read: 4
Thread 123711848236608 read: 62
Thread 123711848236608 read: 33
Thread 123711848236608 read: 94
Thread 123711848236608 read: 25
Thread 123711848236608 read: 70
Thread 123711848236608 read: 12
Thread 123711848236608 read: 41
Main thread finished.