Files
concurrency-in-action/source/listing_6.3.cpp
2018-10-18 00:40:34 -05:00

66 lines
1.5 KiB
C++

#include <condition_variable>
#include <memory>
#include <mutex>
#include <queue>
template <typename T>
class threadsafe_queue {
private:
mutable std::mutex mut;
std::queue<std::shared_ptr<T>> data_queue;
std::condition_variable data_cond;
public:
threadsafe_queue() {}
void wait_and_pop(T& value)
{
std::unique_lock<std::mutex> lk(mut);
data_cond.wait(lk, [this] { return !data_queue.empty(); });
value = std::move(*data_queue.front());
data_queue.pop();
}
bool try_pop(T& value)
{
std::lock_guard<std::mutex> lk(mut);
if (data_queue.empty())
return false;
value = std::move(*data_queue.front());
data_queue.pop();
}
std::shared_ptr<T> wait_and_pop()
{
std::unique_lock<std::mutex> lk(mut);
data_cond.wait(lk, [this] { return !data_queue.empty(); });
std::shared_ptr<T> res = data_queue.front();
data_queue.pop();
return res;
}
std::shared_ptr<T> try_pop()
{
std::lock_guard<std::mutex> lk(mut);
if (data_queue.empty())
return std::shared_ptr<T>();
std::shared_ptr<T> res = data_queue.front();
data_queue.pop();
return res;
}
bool empty() const
{
std::lock_guard<std::mutex> lk(mut);
return data_queue.empty();
}
void push(T new_value)
{
std::shared_ptr<T> data(std::make_shared<T>(std::move(new_value)));
std::lock_guard<std::mutex> lk(mut);
data_queue.push(data);
data_cond.notify_one();
}
};