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Utility.cs
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Utility.cs
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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
namespace Garnet.client
{
/// <summary>
/// Utility functions
/// </summary>
public static class Utility
{
/// <summary>
/// Get size of type
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="value"></param>
/// <returns></returns>
internal static unsafe int GetSize<T>(this T value)
{
T[] arr = new T[2];
return (int)((long)Unsafe.AsPointer(ref arr[1]) - (long)Unsafe.AsPointer(ref arr[0]));
}
internal static bool IsBlittableType(Type t)
{
var mi = typeof(Utility).GetMethod("IsBlittable", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.InvokeMethod);
var fooRef = mi.MakeGenericMethod(t);
return (bool)fooRef.Invoke(null, null);
}
/// <summary>
/// Parse size in string notation into long.
/// Examples: 4k, 4K, 4KB, 4 KB, 8m, 8MB, 12g, 12 GB, 16t, 16 TB, 32p, 32 PB.
/// </summary>
/// <param name="value">String version of number</param>
/// <returns>The number</returns>
public static long ParseSize(string value)
{
char[] suffix = new char[] { 'k', 'm', 'g', 't', 'p' };
long result = 0;
foreach (char c in value)
{
if (char.IsDigit(c))
{
result = result * 10 + (byte)c - '0';
}
else
{
for (int i = 0; i < suffix.Length; i++)
{
if (char.ToLower(c) == suffix[i])
{
result *= (long)Math.Pow(1024, i + 1);
return result;
}
}
}
}
return result;
}
/// <summary>
/// Num bits in the previous power of 2 for specified number
/// </summary>
/// <param name="v"></param>
/// <param name="logger"></param>
/// <returns></returns>
internal static int NumBitsPreviousPowerOf2(long v, ILogger logger = null)
{
long adjustedSize = PreviousPowerOf2(v);
if (v != adjustedSize)
logger?.LogInformation($"Warning: using lower value {adjustedSize} instead of specified value {v}");
return (int)Math.Log(adjustedSize, 2);
}
/// <summary>
/// Previous power of 2
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
public static long PreviousPowerOf2(long v)
{
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v |= v >> 32;
return v - (v >> 1);
}
/// <summary>
/// Pretty print value
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
internal static string PrettySize(long value)
{
char[] suffix = new char[] { 'K', 'M', 'G', 'T', 'P' };
double v = value;
int exp = 0;
while (v - Math.Floor(v) > 0)
{
if (exp >= 18)
break;
exp += 3;
v *= 1024;
v = Math.Round(v, 12);
}
while (Math.Floor(v).ToString().Length > 3)
{
if (exp <= -18)
break;
exp -= 3;
v /= 1024;
v = Math.Round(v, 12);
}
if (exp > 0)
return v.ToString() + suffix[exp / 3 - 1] + "B";
else if (exp < 0)
return v.ToString() + suffix[-exp / 3 - 1] + "B";
return v.ToString() + "B";
}
/// <summary>
/// Is type blittable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
internal static bool IsBlittable<T>()
{
if (default(T) == null)
return false;
try
{
var tmp = new T[1];
var h = GCHandle.Alloc(tmp, GCHandleType.Pinned);
h.Free();
}
catch (Exception)
{
return false;
}
return true;
}
/// <summary>
/// Check if two byte arrays of given length are equal
/// </summary>
/// <param name="src"></param>
/// <param name="dst"></param>
/// <param name="length"></param>
/// <returns></returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static unsafe bool IsEqual(byte* src, byte* dst, int length)
{
for (int i = 0; i < length; i++)
{
if (*(src + i) != *(dst + i))
{
return false;
}
}
return true;
}
/// <summary>
/// Copy numBytes bytes from src to dest
/// </summary>
/// <param name="src"></param>
/// <param name="dest"></param>
/// <param name="numBytes"></param>
public static unsafe void Copy(byte* src, byte* dest, int numBytes)
{
for (int i = 0; i < numBytes; i++)
{
*(dest + i) = *(src + i);
}
}
/// <summary>
/// A 32-bit murmur3 implementation.
/// </summary>
/// <param name="h"></param>
/// <returns></returns>
public static int Murmur3(int h)
{
uint a = (uint)h;
a ^= a >> 16;
a *= 0x85ebca6b;
a ^= a >> 13;
a *= 0xc2b2ae35;
a ^= a >> 16;
return (int)a;
}
/// <summary>
/// Updates the variable to newValue only if the current value is smaller than the new value.
/// </summary>
/// <param name="variable">The variable to possibly replace</param>
/// <param name="newValue">The value that replaces the variable if successful</param>
/// <param name="wrapDistance">Wrap distance</param>
/// <param name="oldValue">The orignal value in the variable</param>
/// <returns> if oldValue less than newValue </returns>
public static bool MonotonicUpdate(ref long variable, long newValue, long wrapDistance, out long oldValue)
{
do
{
oldValue = variable;
if (newValue <= oldValue && (oldValue - newValue <= wrapDistance))
return false;
} while (Interlocked.CompareExchange(ref variable, newValue, oldValue) != oldValue);
return true;
}
/// <summary>
/// Updates the variable to newValue only if the current value is smaller than the new value.
/// </summary>
/// <param name="variable">The variable to possibly replace</param>
/// <param name="newValue">The value that replaces the variable if successful</param>
/// <param name="oldValue">The orignal value in the variable</param>
/// <returns>if oldValue less than or equal to newValue</returns>
public static bool MonotonicUpdate(ref int variable, int newValue, out int oldValue)
{
do
{
oldValue = variable;
if (oldValue >= newValue) return false;
} while (Interlocked.CompareExchange(ref variable, newValue, oldValue) != oldValue);
return true;
}
/// <summary>
/// Throws OperationCanceledException if token cancels before the real task completes.
/// Doesn't abort the inner task, but allows the calling code to get "unblocked" and react to stuck tasks.
/// </summary>
internal static Task<T> WithCancellationAsync<T>(this Task<T> task, CancellationToken token, bool useSynchronizationContext = false)
{
if (!token.CanBeCanceled || task.IsCompleted)
{
return task;
}
else if (token.IsCancellationRequested)
{
return Task.FromCanceled<T>(token);
}
return SlowWithCancellationAsync(task, token, useSynchronizationContext);
}
private static async Task<T> SlowWithCancellationAsync<T>(Task<T> task, CancellationToken token, bool useSynchronizationContext)
{
var tcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
using (token.Register(s => ((TaskCompletionSource<bool>)s).TrySetResult(true), tcs, useSynchronizationContext))
{
if (task != await Task.WhenAny(task, tcs.Task))
{
token.ThrowIfCancellationRequested();
}
}
// make sure any exceptions in the task get unwrapped and exposed to the caller.
return await task;
}
}
}