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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace Grpc.Core.Internal
{
/// <summary>
/// gpr_timespec from grpc/support/time.h
/// </summary>
[StructLayout(LayoutKind.Sequential)]
internal struct Timespec
{
const int NanosPerSecond = 1000 * 1000 * 1000;
const int NanosPerTick = 100;
static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
[DllImport("grpc_csharp_ext.dll")]
static extern Timespec gprsharp_now();
[DllImport("grpc_csharp_ext.dll")]
static extern Timespec gprsharp_inf_future();
[DllImport("grpc_csharp_ext.dll")]
static extern int gprsharp_sizeof_timespec();
public Timespec(IntPtr tv_sec, int tv_nsec)
{
this.tv_sec = tv_sec;
this.tv_nsec = tv_nsec;
this.clock_type = GPRClockType.Realtime;
}
// NOTE: on linux 64bit sizeof(gpr_timespec) = 16, on windows 32bit sizeof(gpr_timespec) = 8
// so IntPtr seems to have the right size to work on both.
public System.IntPtr tv_sec;
public int tv_nsec;
public GPRClockType clock_type;
/// <summary>
/// Timespec a long time in the future.
/// </summary>
public static Timespec InfFuture
{
get
{
return gprsharp_inf_future();
}
}
public static Timespec Now
{
get
{
return gprsharp_now();
}
}
public DateTime ToDateTime()
{
return UnixEpoch.AddTicks(tv_sec.ToInt64() * (NanosPerSecond / NanosPerTick) + tv_nsec / NanosPerTick);
}
internal static int NativeSize
{
get
{
return gprsharp_sizeof_timespec();
}
}
/// <summary>
/// Creates a GPR deadline from current instant and given timeout.
/// </summary>
/// <returns>The from timeout.</returns>
public static Timespec DeadlineFromTimeout(TimeSpan timeout)
{
if (timeout == Timeout.InfiniteTimeSpan)
{
return Timespec.InfFuture;
}
return Timespec.Now.Add(timeout);
}
public Timespec Add(TimeSpan timeSpan)
{
long nanos = (long)tv_nsec + (timeSpan.Ticks % TimeSpan.TicksPerSecond) * NanosPerTick;
long overflow_sec = (nanos > NanosPerSecond) ? 1 : 0;
Timespec result;
result.tv_nsec = (int)(nanos % NanosPerSecond);
result.tv_sec = new IntPtr(tv_sec.ToInt64() + (timeSpan.Ticks / TimeSpan.TicksPerSecond) + overflow_sec);
result.clock_type = GPRClockType.Realtime;
return result;
}
}
}
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