ryujinx/Ryujinx.HLE/HOS/Kernel/Threading/KCriticalSection.cs
gdkchan 15d1cc806b
Move kernel state out of the Horizon class (#1107)
* Move kernel state from Horizon to KernelContext

* Merge syscalls partial classes, split 32 and 64-bit variants

* Sort usings
2020-05-04 13:41:29 +10:00

92 lines
2.7 KiB
C#

using System.Threading;
namespace Ryujinx.HLE.HOS.Kernel.Threading
{
class KCriticalSection
{
private readonly KernelContext _context;
public object LockObj { get; private set; }
private int _recursionCount;
public KCriticalSection(KernelContext context)
{
_context = context;
LockObj = new object();
}
public void Enter()
{
Monitor.Enter(LockObj);
_recursionCount++;
}
public void Leave()
{
if (_recursionCount == 0)
{
return;
}
bool doContextSwitch = false;
if (--_recursionCount == 0)
{
if (_context.Scheduler.ThreadReselectionRequested)
{
_context.Scheduler.SelectThreads();
}
Monitor.Exit(LockObj);
if (_context.Scheduler.MultiCoreScheduling)
{
lock (_context.Scheduler.CoreContexts)
{
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
KCoreContext coreContext = _context.Scheduler.CoreContexts[core];
if (coreContext.ContextSwitchNeeded)
{
KThread currentThread = coreContext.CurrentThread;
if (currentThread == null)
{
// Nothing is running, we can perform the context switch immediately.
coreContext.ContextSwitch();
}
else if (currentThread.IsCurrentHostThread())
{
// Thread running on the current core, context switch will block.
doContextSwitch = true;
}
else
{
// Thread running on another core, request a interrupt.
currentThread.Context.RequestInterrupt();
}
}
}
}
}
else
{
doContextSwitch = true;
}
}
else
{
Monitor.Exit(LockObj);
}
if (doContextSwitch)
{
_context.Scheduler.ContextSwitch();
}
}
}
}