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Rewrite scheduler context switch code (#1786)

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* Rewrite scheduler context switch code

* Fix race in UnmapIpcRestorePermission

* Fix thread exit issue that could leave the scheduler in a invalid state

* Change context switch method to not wait on guest thread, remove spin wait, use SignalAndWait to pass control

* Remove multi-core setting (it is always on now)

* Re-enable assert

* Remove multicore from default config and schema

* Fix race in KTimeManager
This commit is contained in:
gdkchan 2020-12-09 19:20:05 -03:00 • committed by GitHub
parent 3484265d37
commit 48278905d1
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GPG key ID: 4AEE18F83AFDEB23
37 changed files with 1080 additions and 1160 deletions
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74
Ryujinx.HLE/HOS/Kernel/Threading/KCriticalSection.cs
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@ -5,21 +5,20 @@ namespace Ryujinx.HLE.HOS.Kernel.Threading
class KCriticalSection
{
private readonly KernelContext _context;
public object LockObj { get; private set; }
private readonly object _lock;
private int _recursionCount;
public object Lock => _lock;
public KCriticalSection(KernelContext context)
{
_context = context;
LockObj = new object();
_lock = new object();
}
public void Enter()
{
Monitor.Enter(LockObj);
Monitor.Enter(_lock);
_recursionCount++;
}
@ -31,61 +30,34 @@ namespace Ryujinx.HLE.HOS.Kernel.Threading
return;
}
bool doContextSwitch = false;
if (--_recursionCount == 0)
{
if (_context.Scheduler.ThreadReselectionRequested)
ulong scheduledCoresMask = KScheduler.SelectThreads(_context);
Monitor.Exit(_lock);
KThread currentThread = KernelStatic.GetCurrentThread();
bool isCurrentThreadSchedulable = currentThread != null && currentThread.IsSchedulable;
if (isCurrentThreadSchedulable)
{
_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();
}
}
}
}
KScheduler.EnableScheduling(_context, scheduledCoresMask);
}
else
{
doContextSwitch = true;
KScheduler.EnableSchedulingFromForeignThread(_context, scheduledCoresMask);
// If the thread exists but is not schedulable, we still want to suspend
// it if it's not runnable. That allows the kernel to still block HLE threads
// even if they are not scheduled on guest cores.
if (currentThread != null && !currentThread.IsSchedulable && currentThread.Context.Running)
{
currentThread.SchedulerWaitEvent.WaitOne();
}
}
}
else
{
Monitor.Exit(LockObj);
}
if (doContextSwitch)
{
_context.Scheduler.ContextSwitch();
Monitor.Exit(_lock);
}
}
}