public unsafe void CouldAcquireReleaseExclusiveLock()
{
var ptr = (long *)Marshal.AllocHGlobal(8);
* ptr = 0;
var wpid = Wpid.Create();
var wpid2 = Wpid.Create();
var sl = new SharedSpinLock(ptr);
Assert.AreEqual(Wpid.Empty, sl.TryAcquireExclusiveLock(wpid, out _, spinLimit: 0)); // fast path
Assert.AreEqual(Wpid.Empty, sl.TryReleaseLock(wpid));
Assert.AreEqual(Wpid.Empty, sl.TryAcquireExclusiveLock(wpid, out _));
var sw = new Stopwatch();
sw.Start();
Assert.AreEqual(wpid, sl.TryAcquireExclusiveLock(wpid2, out _, spinLimit: 1000));
sw.Stop();
Console.WriteLine($"Elapsed: {sw.ElapsedMilliseconds}");
Assert.AreEqual(Wpid.Empty, sl.TryReleaseLock(wpid));
}
public unsafe void UncontentedBench()
{
var ptr = (long *)Marshal.AllocHGlobal(8);
* ptr = 0;
var wpid = Wpid.Create();
var sl = new SharedSpinLock(ptr);
var count = 10_000_000;
for (int _ = 0; _ < 10; _++)
{
using (Benchmark.Run("Uncontented", count))
{
for (int i = 0; i < count; i++)
{
sl.TryAcquireLock(wpid);
sl.TryReleaseLock(wpid);
}
}
}
Benchmark.Dump();
}
public Wpid TryAcquireLock(Wpid wpid, IWpidHelper wpidHelper, int spinLimit = 0)
{
var content = *(long *)(_statePointer);
*(long *)(_statePointer) = 0;
return(SharedSpinLock.TryAcquireLock(ref *(long *)(_statePointer + StreamLogStateRecord.LockerOffset), wpid, spinLimit, wpidHelper));
}
public unsafe void CouldAcquireEnterExitReleaseExclusiveLock()
{
var ptr = (long *)Marshal.AllocHGlobal(8);
* ptr = 0;
var wpid = Wpid.Create();
var wpid2 = Wpid.Create();
var sl = new SharedSpinLock(ptr);
Assert.AreEqual(Wpid.Empty, sl.TryAcquireExclusiveLock(wpid, out var tt, spinLimit: 0));
Assert.AreEqual(Wpid.Empty, sl.TryReEnterExclusiveLock(wpid, tt, spinLimit: 0));
Assert.Throws <InvalidOperationException>(() => { sl.TryReleaseLock(wpid); });
Assert.AreEqual(Wpid.Empty, sl.TryExitExclusiveLock(wpid, tt));
Assert.AreEqual(Wpid.Empty, sl.TryReleaseLock(wpid));
}
public unsafe void ReleasingOthersLockReturnsOthersWpid()
{
var ptr = (long *)Marshal.AllocHGlobal(8);
* ptr = 0;
var wpid = Wpid.Create();
var wpid2 = Wpid.Create();
var sl = new SharedSpinLock(ptr);
Assert.AreEqual(Wpid.Empty, sl.TryAcquireLock(wpid, spinLimit: 0)); // fast path
Assert.AreEqual(Wpid.Empty, sl.TryReleaseLock(wpid));
Assert.AreEqual(Wpid.Empty, sl.TryAcquireLock(wpid));
// wpid holding the lock
var holder = sl.TryReleaseLock(wpid2);
Assert.AreEqual(wpid, holder);
}
public Wpid TryReleaseLock(Wpid wpid)
{
return(SharedSpinLock.TryReleaseLock(ref *(long *)(_statePointer + StreamLogStateRecord.LockerOffset), wpid));
}
public Wpid TryExitExclusiveLock(Wpid wpid, byte threadToken)
{
return(SharedSpinLock.TryExitExclusiveLock(ref *(long *)(_statePointer + StreamLogStateRecord.LockerOffset), wpid, threadToken));
}
public Wpid TryReEnterExclusiveLock(Wpid wpid, IWpidHelper wpidHelper, byte threadToken, int spinLimit = 0)
{
var holder = LockHolder;
return(SharedSpinLock.TryReEnterExclusiveLock(ref *(long *)(_statePointer + StreamLogStateRecord.LockerOffset), wpid, threadToken, spinLimit, wpidHelper));
}
public Wpid TryAcquireExclusiveLock(Wpid wpid, IWpidHelper wpidHelper, out byte threadToken, int spinLimit = 0)
{
var res = SharedSpinLock.TryAcquireExclusiveLock(ref *(long *)(_statePointer + StreamLogStateRecord.LockerOffset), wpid, out threadToken, spinLimit, wpidHelper);
return(res);
}