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// std::lock example
#include <iostream> // std::cout
#include <thread> // std::thread
#include <mutex> // std::mutex, std::lock
std::mutex foo,bar;
void task_a () {
// foo.lock(); bar.lock(); // replaced by:
std::lock (foo,bar);
std::cout << "task a\n";
foo.unlock();
bar.unlock();
}
void task_b () {
// bar.lock(); foo.lock(); // replaced by:
std::lock (bar,foo);
std::cout << "task b\n";
bar.unlock();
foo.unlock();
}
int main ()
{
std::thread th1 (task_a);
std::thread th2 (task_b);
th1.join();
th2.join();
return 0;
}
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