Atmosphere/mesosphere/source/kresources/KResourceLimit.cpp

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2018-10-31 21:47:31 +01:00
#include <mesosphere/kresources/KResourceLimit.hpp>
namespace mesosphere
{
KResourceLimit KResourceLimit::defaultInstance{};
size_t KResourceLimit::GetCurrentValue(KResourceLimit::Category category) const
{
// Caller should check category
std::lock_guard guard{condvar.mutex()};
return currentValues[(uint)category];
}
size_t KResourceLimit::GetLimitValue(KResourceLimit::Category category) const
{
// Caller should check category
std::lock_guard guard{condvar.mutex()};
return limitValues[(uint)category];
}
size_t KResourceLimit::GetRemainingValue(KResourceLimit::Category category) const
{
// Caller should check category
std::lock_guard guard{condvar.mutex()};
return limitValues[(uint)category] - currentValues[(uint)category];
}
bool KResourceLimit::SetLimitValue(KResourceLimit::Category category, size_t value)
{
std::lock_guard guard{condvar.mutex()};
if ((long)value < 0 || currentValues[(uint)category] > value) {
return false;
} else {
limitValues[(uint)category] = value;
return true;
}
}
void KResourceLimit::Release(KResourceLimit::Category category, size_t count, size_t realCount)
{
// Caller should ensure parameters are correct
std::lock_guard guard{condvar.mutex()};
currentValues[(uint)category] -= count;
realValues[(uint)category] -= realCount;
condvar.notify_all();
}
bool KResourceLimit::ReserveDetail(KResourceLimit::Category category, size_t count, const KSystemClock::time_point &timeoutTime)
{
std::lock_guard guard{condvar.mutex()};
if ((long)count <= 0 || realValues[(uint)category] >= limitValues[(uint)category]) {
return false;
}
size_t newCur = currentValues[(uint)category] + count;
bool ok = false;
auto condition =
[=, &newCur] {
newCur = this->currentValues[(uint)category] + count;
size_t lval = this->limitValues[(uint)category];
return this->realValues[(uint)category] <= lval && newCur <= lval; // need to check here
};
if (timeoutTime <= KSystemClock::never) {
// TODO, check is actually < 0
// TODO timeout
ok = true;
condvar.wait(condition);
} else {
ok = condvar.wait_until(timeoutTime, condition);
}
if (ok) {
currentValues[(uint)category] += count;
realValues[(uint)category] += count;
}
return ok;
}
}