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#include "throttle.h"
namespace crimson::common {
int64_t Throttle::take(int64_t c)
{
if (!max) {
return 0;
}
count += c;
return count;
}
int64_t Throttle::put(int64_t c)
{
if (!max) {
return 0;
}
if (!c) {
return count;
}
on_free_slots.signal();
count -= c;
return count;
}
seastar::future<> Throttle::get(size_t c)
{
if (!max) {
return seastar::make_ready_future<>();
}
return on_free_slots.wait([this, c] {
return !_should_wait(c);
}).then([this, c] {
count += c;
return seastar::make_ready_future<>();
});
}
void Throttle::reset_max(size_t m) {
if (max == m) {
return;
}
if (m > max) {
on_free_slots.signal();
}
max = m;
}
bool Throttle::_should_wait(size_t c) const {
if (!max) {
return false;
}
return ((c <= max && count + c > max) || // normally stay under max
(c >= max && count > max)); // except for large c
}
} // namespace crimson::common
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