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Fix some thread sync issues (#172)

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* Fix some thread sync issues

* Remove some debug stuff

* Ensure that writes to the mutex address clears the exclusive monitor
This commit is contained in:
gdkchan 2018-06-21 23:05:42 -03:00 • committed by GitHub
parent a4020bb398
commit 3e6afeb513
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 239 additions and 189 deletions
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115
ChocolArm64/Memory/AMemory.cs
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@ -6,6 +6,7 @@ using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
using System.Threading;
namespace ChocolArm64.Memory
{
@ -15,32 +16,18 @@ namespace ChocolArm64.Memory
public AMemoryMgr Manager { get; private set; }
private struct ExMonitor
private class ArmMonitor
{
public long Position { get; private set; }
private bool ExState;
public ExMonitor(long Position, bool ExState)
{
this.Position = Position;
this.ExState = ExState;
}
public long Position;
public bool ExState;
public bool HasExclusiveAccess(long Position)
{
return this.Position == Position && ExState;
}
public void Reset()
{
ExState = false;
}
}
private Dictionary<int, ExMonitor> Monitors;
private HashSet<long> ExAddrs;
private Dictionary<int, ArmMonitor> Monitors;
public IntPtr Ram { get; private set; }
@ -50,9 +37,7 @@ namespace ChocolArm64.Memory
{
Manager = new AMemoryMgr();
Monitors = new Dictionary<int, ExMonitor>();
ExAddrs = new HashSet<long>();
Monitors = new Dictionary<int, ArmMonitor>();
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
@ -66,16 +51,13 @@ namespace ChocolArm64.Memory
RamPtr = (byte*)Ram;
}
public void RemoveMonitor(int ThreadId)
public void RemoveMonitor(AThreadState State)
{
lock (Monitors)
{
if (Monitors.TryGetValue(ThreadId, out ExMonitor Monitor))
{
ExAddrs.Remove(Monitor.Position);
}
ClearExclusive(State);
Monitors.Remove(ThreadId);
Monitors.Remove(State.ThreadId);
}
}
@ -85,66 +67,85 @@ namespace ChocolArm64.Memory
lock (Monitors)
{
if (Monitors.TryGetValue(ThreadState.ThreadId, out ExMonitor Monitor))
foreach (ArmMonitor Mon in Monitors.Values)
{
ExAddrs.Remove(Monitor.Position);
if (Mon.Position == Position && Mon.ExState)
{
Mon.ExState = false;
}
}
bool ExState = ExAddrs.Add(Position);
Monitor = new ExMonitor(Position, ExState);
if (!Monitors.TryAdd(ThreadState.ThreadId, Monitor))
if (!Monitors.TryGetValue(ThreadState.ThreadId, out ArmMonitor ThreadMon))
{
Monitors[ThreadState.ThreadId] = Monitor;
ThreadMon = new ArmMonitor();
Monitors.Add(ThreadState.ThreadId, ThreadMon);
}
ThreadMon.Position = Position;
ThreadMon.ExState = true;
}
}
public bool TestExclusive(AThreadState ThreadState, long Position)
{
//Note: Any call to this method also should be followed by a
//call to ClearExclusiveForStore if this method returns true.
Position &= ~ErgMask;
lock (Monitors)
{
if (!Monitors.TryGetValue(ThreadState.ThreadId, out ExMonitor Monitor))
{
return false;
}
Monitor.Enter(Monitors);
return Monitor.HasExclusiveAccess(Position);
if (!Monitors.TryGetValue(ThreadState.ThreadId, out ArmMonitor ThreadMon))
{
return false;
}
bool ExState = ThreadMon.HasExclusiveAccess(Position);
if (!ExState)
{
Monitor.Exit(Monitors);
}
return ExState;
}
public void ClearExclusiveForStore(AThreadState ThreadState)
{
if (Monitors.TryGetValue(ThreadState.ThreadId, out ArmMonitor ThreadMon))
{
ThreadMon.ExState = false;
}
Monitor.Exit(Monitors);
}
public void ClearExclusive(AThreadState ThreadState)
{
lock (Monitors)
{
if (Monitors.TryGetValue(ThreadState.ThreadId, out ExMonitor Monitor))
if (Monitors.TryGetValue(ThreadState.ThreadId, out ArmMonitor ThreadMon))
{
Monitor.Reset();
ExAddrs.Remove(Monitor.Position);
ThreadMon.ExState = false;
}
}
}
public bool AcquireAddress(long Position)
public void WriteInt32ToSharedAddr(long Position, int Value)
{
Position &= ~ErgMask;
long MaskedPosition = Position & ~ErgMask;
lock (Monitors)
{
return ExAddrs.Add(Position);
}
}
foreach (ArmMonitor Mon in Monitors.Values)
{
if (Mon.Position == MaskedPosition && Mon.ExState)
{
Mon.ExState = false;
}
}
public void ReleaseAddress(long Position)
{
Position &= ~ErgMask;
lock (Monitors)
{
ExAddrs.Remove(Position);
WriteInt32(Position, Value);
}
}