值得注意的是,C++11 引入了thread_local
关键字。
这是存储持续时间说明符的示例:
#include <iostream>
#include <string>
#include <thread>
#include <mutex>
thread_local unsigned int rage = 1;
std::mutex cout_mutex;
void increase_rage(const std::string& thread_name)
{
++rage;
std::lock_guard<std::mutex> lock(cout_mutex);
std::cout << "Rage counter for " << thread_name << ": " << rage << '\n';
}
int main()
{
std::thread a(increase_rage, "a"), b(increase_rage, "b");
increase_rage("main");
a.join();
b.join();
return 0;
}
可能的输出:
Rage counter for a: 2
Rage counter for main: 2
Rage counter for b: 2