affinity_linux.go

// The MIT License (MIT)
//
// Copyright (c) 2019 xtaci
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.

//go:build linux

package gaio

import (
	"runtime"

	"golang.org/x/sys/unix"
)

// setAffinity binds the current goroutine and its underlying thread to a specific CPU.
// This function locks the goroutine to the current thread, then sets the thread's CPU affinity
// to the specified CPU, which can improve performance by reducing context switching.
func setAffinity(cpuId int32) {
	var newMask unix.CPUSet
	newMask.Set(int(cpuId))
	runtime.LockOSThread() // Lock the current goroutine to its current thread
	_ = unix.SchedSetaffinity(0, &newMask)
}