有:
void executable(){
while(run) { // for thread
cout << "Printing the memory:" << endl;
for (auto& t : map) {
cout << t.first << " " << t.second << "\n";
}
}
}
需要实例化执行executable()函数的5个线程:
for (int i = 0; i < 5; i++)
threads.push_back(thread(&CPU::executable, this)); //creating threads
cout << "Synchronizing all threads...\n";
for (auto& th : threads) th.join(); //waits for all of them to finish
现在,我想创建:
void executable0 () {
while(run) {
cout << "Printing the memory:" << endl;
for (auto& t : map) {
cout << t.first << " " << t.second << "\n";
}
}
}
void executable1 () {....}
to executable4() {....} // using that five threads that I`ve done above.
我该怎么办?初始化或使用std:thread构造函数?
有人能给我一个例子来理解这个过程。感谢和问候!
在一些程序员老兄的评论之后,我还建议使用std::function
的标准容器:
#include <iostream>
#include <thread>
#include <map>
#include <functional>
#include <vector>
class CPU {
std::vector<std::function<void()>> executables{};
std::vector<std::thread> threads{};
public:
CPU() {
executables.emplace_back([](){
std::cout << "executable0\n";
});
executables.emplace_back([](){
std::cout << "executable1\n";
});
executables.emplace_back([](){
std::cout << "executable2\n";
});
}
void create_and_exec_threads() {
for(const auto executable : executables) {
threads.emplace_back([=](){ executable(); });
}
for(auto& thread : threads) {
thread.join();
}
}
};
我们创建了一个持有三个回调的vector
,它将用于初始化thread
s并在create_and_exec_threads
方法中启动它们。
请注意,与示例中的注释相反,创建带有回调传递给其构造函数的std::thread
不仅会构造thread
,而且还会立即启动它。
此外,std::thread::join
方法不启动thread
。它等待它完成。