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
29
30
|
// unique_lock::mutex example
#include <iostream> // std::cout
#include <thread> // std::thread
#include <mutex> // std::mutex, std::unique_lock, std::defer_lock
class MyMutex : public std::mutex {
int _id;
public:
MyMutex (int id) : _id(id) {}
int id() {return _id;}
};
MyMutex mtx (101);
void print_ids (int id) {
std::unique_lock<MyMutex> lck (mtx);
std::cout << "thread #" << id << " locked mutex " << lck.mutex()->id() << '\n';
}
int main ()
{
std::thread threads[10];
// spawn 10 threads:
for (int i=0; i<10; ++i)
threads[i] = std::thread(print_ids,i+1);
for (auto& th : threads) th.join();
return 0;
}
| |