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using Ryujinx.Common;
using Ryujinx.HLE.HOS.Kernel.Threading;
using System.Collections.Generic;
namespace Ryujinx.HLE.HOS.Kernel.Common
{
class KResourceLimit : KAutoObject
{
private const int DefaultTimeoutMs = 10000; // 10s
private readonly long[] _current;
private readonly long[] _limit;
private readonly long[] _current2;
private readonly long[] _peak;
private readonly object _lock;
private readonly LinkedList<KThread> _waitingThreads;
private int _waitingThreadsCount;
public KResourceLimit(KernelContext context) : base(context)
{
_current = new long[(int)LimitableResource.Count];
_limit = new long[(int)LimitableResource.Count];
_current2 = new long[(int)LimitableResource.Count];
_peak = new long[(int)LimitableResource.Count];
_lock = new object();
_waitingThreads = new LinkedList<KThread>();
}
public bool Reserve(LimitableResource resource, ulong amount)
{
return Reserve(resource, (long)amount);
}
public bool Reserve(LimitableResource resource, long amount)
{
return Reserve(resource, amount, KTimeManager.ConvertMillisecondsToNanoseconds(DefaultTimeoutMs));
}
public bool Reserve(LimitableResource resource, long amount, long timeout)
{
long endTimePoint = KTimeManager.ConvertNanosecondsToMilliseconds(timeout);
endTimePoint += PerformanceCounter.ElapsedMilliseconds;
bool success = false;
int index = GetIndex(resource);
lock (_lock)
{
if (_current2[index] >= _limit[index])
{
return false;
}
long newCurrent = _current[index] + amount;
while (newCurrent > _limit[index] && _current2[index] + amount <= _limit[index])
{
_waitingThreadsCount++;
KConditionVariable.Wait(KernelContext, _waitingThreads, _lock, timeout);
_waitingThreadsCount--;
newCurrent = _current[index] + amount;
if (timeout >= 0 && PerformanceCounter.ElapsedMilliseconds > endTimePoint)
{
break;
}
}
if (newCurrent <= _limit[index])
{
_current[index] = newCurrent;
_current2[index] += amount;
if (_current[index] > _peak[index])
{
_peak[index] = _current[index];
}
success = true;
}
}
return success;
}
public void Release(LimitableResource resource, ulong amount)
{
Release(resource, (long)amount);
}
public void Release(LimitableResource resource, long amount)
{
Release(resource, amount, amount);
}
public void Release(LimitableResource resource, long amount, long amount2)
{
int index = GetIndex(resource);
lock (_lock)
{
_current[index] -= amount;
_current2[index] -= amount2;
if (_waitingThreadsCount > 0)
{
KConditionVariable.NotifyAll(KernelContext, _waitingThreads);
}
}
}
public long GetRemainingValue(LimitableResource resource)
{
int index = GetIndex(resource);
lock (_lock)
{
return _limit[index] - _current[index];
}
}
public long GetCurrentValue(LimitableResource resource)
{
int index = GetIndex(resource);
lock (_lock)
{
return _current[index];
}
}
public long GetLimitValue(LimitableResource resource)
{
int index = GetIndex(resource);
lock (_lock)
{
return _limit[index];
}
}
public long GetPeakValue(LimitableResource resource)
{
int index = GetIndex(resource);
lock (_lock)
{
return _peak[index];
}
}
public KernelResult SetLimitValue(LimitableResource resource, long limit)
{
int index = GetIndex(resource);
lock (_lock)
{
if (_current[index] <= limit)
{
_limit[index] = limit;
_peak[index] = _current[index];
return KernelResult.Success;
}
else
{
return KernelResult.InvalidState;
}
}
}
private static int GetIndex(LimitableResource resource)
{
return (int)resource;
}
}
}
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