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using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace Google.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;
[DllImport("libgpr.so")]
static extern Timespec gpr_now();
// TODO: this only works on 64bit linux, can we autoselect the right size of ints?
// perhaps using IntPtr would work.
public System.Int64 tv_sec;
public System.Int64 tv_nsec;
/// <summary>
/// Timespec a long time in the future.
/// </summary>
public static Timespec InfFuture
{
get
{
// TODO: set correct value based on the length of the struct
return new Timespec { tv_sec = Int32.MaxValue, tv_nsec = 0 };
}
}
public static Timespec Now
{
get
{
return gpr_now();
}
}
/// <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 = tv_nsec + (timeSpan.Ticks % TimeSpan.TicksPerSecond) * nanosPerTick;
long overflow_sec = (nanos > nanosPerSecond) ? 1 : 0;
Timespec result;
result.tv_nsec = nanos % nanosPerSecond;
result.tv_sec = tv_sec + (timeSpan.Ticks / TimeSpan.TicksPerSecond) + overflow_sec;
return result;
}
}
}
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