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问题描述
我的代码:
#include <iostream>
#include <thread>
void function_1()
{
std::cout << "Thread t1 started!\n";
for (int j=0; j>-100; j--) {
std::cout << "t1 says: " << j << "\n";
}
}
int main()
{
std::thread t1(function_1); // t1 starts running
for (int i=0; i<100; i++) {
std::cout << "from main: " << i << "\n";
}
t1.join(); // main thread waits for t1 to finish
return 0;
}
我创建了一个 thread
以降序打印数字,而 main
以升序打印.
I create a thread
that prints numbers in decreasing order while main
prints in increasing order.
示例输出此处.为什么我的代码打印垃圾?
Sample output here. Why is my code printing garbage ?
推荐答案
两个线程同时输出,从而打乱了你的输出.打印部分需要某种线程同步机制.
Both threads are outputting at the same time, thereby scrambling your output.You need some kind of thread synchronization mechanism on the printing part.
有关使用 此答案w/cpp/thread/mutex" rel="nofollow noreferrer">std::mutex
结合 std::lock_guard
用于 cout
.
See this answer for an example using a std::mutex
combined with std::lock_guard
for cout
.
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