/// <summary>
/// 申请锁，每间隔 4 次调用 1 次 Thread.Sleep(0)，用于高频高冲突场景（不检测休眠标识，和 SpinLock.Enter4 效果一样）
/// </summary>
public void EnterNotCheckSleepFlag()
{
do
{
if (System.Threading.Interlocked.CompareExchange(ref lockValue, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref lockValue, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref lockValue, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref lockValue, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref lockValue, 1, 0) == 0)
{
return;
}
System.Threading.Thread.Sleep(0);
}while (true);
}
/// <summary>
/// 申请锁，每间隔 4 次调用 1 次 Thread.Sleep(0)，用于高频一般冲突场景
/// </summary>
public void EnterYield()
{
do
{
if (System.Threading.Interlocked.CompareExchange(ref Lock, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref Lock, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref Lock, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref Lock, 1, 0) == 0)
{
return;
}
ThreadYield.YieldOnly();
if (System.Threading.Interlocked.CompareExchange(ref Lock, 1, 0) == 0)
{
return;
}
System.Threading.Thread.Sleep(0);
}while (true);
}
/// <summary>
/// 获取下一个ID
/// </summary>
/// <returns></returns>
public long GetNext()
{
while (System.Threading.Interlocked.CompareExchange(ref identityLock, 1, 0) != 0)
{
ThreadYield.YieldOnly();
}
long timestamp = startTimestamp + Date.TimestampDifference;
if (timestamp < maxTimestamp)
{
long identity = (currentIdentity += identityIncrement);
if ((identity & mask) != 0)
{
System.Threading.Interlocked.Exchange(ref identityLock, 0);
return(identity);
}
if (--timestampCount == 0)
{
maxTimestamp += Date.MillisecondTimestampDifferencePerSecond;
timestampCount = 1000;
}
maxTimestamp += Date.TimestampPerMillisecond;
System.Threading.Interlocked.Exchange(ref identityLock, 0);
return(identity);
}
else if (timestamp == maxTimestamp)
{
long identity = (((currentIdentity >> bits) + 1) << bits) | distributed;
if (--timestampCount == 0)
{
maxTimestamp += Date.MillisecondTimestampDifferencePerSecond;
timestampCount = 1000;
}
currentIdentity = identity;
maxTimestamp += Date.TimestampPerMillisecond;
System.Threading.Interlocked.Exchange(ref identityLock, 0);
return(identity);
}
else
{
long identity = Date.GetMillisecondsByTimestamp(timestamp), lastIdentity = currentIdentity >> bits;
while (identity <= lastIdentity)
{
++identity;
}
timestampCount = 1000;
maxTimestamp = Date.GetTimestampByMilliseconds(identity + 1);
currentIdentity = (identity = (identity << bits) | distributed);
System.Threading.Interlocked.Exchange(ref identityLock, 0);
return(identity);
}
}
