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// This file is part of dpdk. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT. No part of dpdk, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2016-2018 The developers of dpdk. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT.
/// A choice of logical core (CPU hyper thread) to use.
#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
#[derive(Deserialize, Serialize)]
pub enum LogicalCoreChoice
{
/// Equivalent to DPDK's `LCORE_ID_ANY`.
Any,
/// A specific logical core.
Specific(LogicalCore),
}
impl Default for LogicalCoreChoice
{
#[inline(always)]
fn default() -> Self
{
LogicalCoreChoice::Any
}
}
impl Into<u32> for LogicalCoreChoice
{
#[inline(always)]
fn into(self) -> u32
{
use self::LogicalCoreChoice::*;
match self
{
Any => Self::LCORE_ID_ANY,
Specific(LogicalCore(value)) => value as u32,
}
}
}
impl LogicalCoreChoice
{
/// DPDK constant.
const LCORE_ID_ANY: u32 = ::std::u32::MAX;
/// For current CPU.
///
/// Returns `Any` if this is not a DPDK EAL thread.
///
/// From a DPDK thread-local static.
#[inline(always)]
pub fn current_logical_core() -> Self
{
Self::from_u32(unsafe { per_lcore__lcore_id })
}
/// Unwraps as a LogicalCore.
///
/// Panics if not a LogicalCore.
#[inline(always)]
pub fn unwrap(self) -> LogicalCore
{
self.expect("This is not a logical core")
}
/// Unwraps as a LogicalCore.
///
/// Panics if not a LogicalCore.
///
/// Takes a `message` for the panic.
#[inline(always)]
pub fn expect(self, message: &str) -> LogicalCore
{
use self::LogicalCoreChoice::*;
// This is a separate function similar to that used by ::std::option::Option.
#[inline(never)]
#[cold]
fn expect_failed(message: &str) -> !
{
panic!("{}", message)
}
match self
{
Any => expect_failed(message),
Specific(logical_core) => logical_core,
}
}
/// Unwraps as a NumaNode or returns a default (the Numa Node for zero).
#[inline(always)]
pub fn unwrap_or_default(self) -> LogicalCore
{
use self::LogicalCoreChoice::*;
match self
{
Any => LogicalCore::default(),
Specific(logical_core) => logical_core,
}
}
//noinspection SpellCheckingInspection
/// Constructs from an `u32` value.
///
/// Panics if the value is out-of-range.
#[inline(always)]
pub fn from_u32(value: u32) -> Self
{
use self::LogicalCoreChoice::*;
if unlikely!(value == Self::LCORE_ID_ANY)
{
Any
}
else
{
debug_assert!((value as u32) < (::std::u16::MAX as u32), "value '{}' exceeds ::std::u16::MAX '{}'", value, ::std::u16::MAX);
Specific(LogicalCore::from_u16(value as u16).unwrap())
}
}
}