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#pragma once
template <typename T, std::size_t N>
struct queue {
std::array<T, N> data;
volatile std::size_t put_idx;
volatile std::size_t get_idx;
async_flag put_flag;
async_flag get_flag;
constexpr std::size_t _inc(std::size_t n) {
return n + 1 < N ? n + 1 : 0;
}
bool empty() {
return put_idx == get_idx;
}
bool full() {
return _inc(put_idx) == get_idx;
}
bool put(T v) {
if(full()) {
return false;
}
data[put_idx] = v;
put_idx = _inc(put_idx);
put_flag.set();
return true;
}
bool get(T& v) {
if(empty()) {
return false;
}
v = data[get_idx];
get_idx = _inc(get_idx);
get_flag.set();
return true;
}
async<> async_put(T v) {
while(!put(v)) {
co_await get_flag;
}
}
async<T> async_get() {
T v;
while(!get(v)) {
co_await put_flag;
}
co_return v;
}
};
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