小编Hoo*_*oon的帖子

#include <iostream>
#include <vector>
#include <thread>
#include <mutex>

struct A {
    std::vector<int> a;
};

struct B{
    std::vector<A> b;
    std::mutex mtx;
};

void work(int id, struct B& b) {
    std::unique_lock<std::mutex> lck(b.mtx);

    b.b.push_back(A());
    struct A& a = b.b.back();

    lck.unlock();

    for(int i = 0; i < 1000; i++) {
        std::cout << id << " " << i << std::endl;
        a.a.push_back(i);
    }
}

int main() {
    struct B b;
    std::thread t1, t2;

    t1 = std::thread([&] {
        work(1, b);
    });

    t2 = std::thread([&] {
        work(2, …