1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
// using atomic as a lock
#include <iostream> // std::cout
#include <atomic> // std::atomic
#include <thread> // std::thread
#include <vector> // std::vector
#include <sstream> // std::stringstream
std::atomic<bool> lock_stream[10];
std::stringstream stream;
void append_number(int x) {
while (lock_stream[x].load()) {}
stream << "thread #" << x << '\n';
stream.flush();
if (x != 9) lock_stream[x + 1].store(false);
}
int main ()
{
std::vector<std::thread> threads;
for (int i = 0; i < 10; ++i) lock_stream[i].store(true);
for (int i=0; i<10; ++i) threads.push_back(std::thread(append_number,i));
lock_stream[0].store(false);
for (auto& th : threads) th.join();
std::cout << stream.str();
return 0;
}
|
