问题描述
我测试了下面的代码,生产者线程无法运行,但删除了std::this_thread::sleep_for(std::chrono::seconds(1));
行,
它可以工作,为什么?
我知道消费者线程存在无限循环
#include <algorithm>
#include <iostream>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <queue>
#include <chrono>
using namespace std;
int main() {
std::queue<int> produced_nums;
std::mutex m;
std::condition_variable cond_var;
bool done = false;
bool notified = false;
std::thread producer([&]() {
pthread_setname_np("producer");
for (int i = 0; i < 5; ++i) {
std::this_thread::sleep_for(std::chrono::seconds(1));
std::unique_lock<std::mutex> lock(m);
std::cout << "producing " << i << '\n';
produced_nums.push(i);
notified = true;
cond_var.notify_one();
}
done = true;
cond_var.notify_one();
});
std::thread consumer([&]() {
pthread_setname_np("consumer");
std::unique_lock<std::mutex> lock(m);
while (!done) {
while (!notified) {
// cond_var.wait(lock);
}
while (!produced_nums.empty()) {
std::cout << "consuming " << produced_nums.front() << endl;
produced_nums.pop();
}
notified = false;
}
});
producer.join();
consumer.join();
std::cout << "end" << endl;
}
解决方法
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