// Copyright (c) 2024 Yiling-J. All rights reserved.
// Copyright (c) 2023 Alexey Mayshev. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package xruntime

import (
	"runtime"
	"unsafe"

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

const (
	// CacheLineSize is useful for preventing false sharing.
	CacheLineSize = unsafe.Sizeof(cpu.CacheLinePad{})
)

// Parallelism returns the maximum possible number of concurrently running goroutines.
func Parallelism() uint32 {
	maxProcs := uint32(runtime.GOMAXPROCS(0))
	numCPU := uint32(runtime.NumCPU())
	if maxProcs < numCPU {
		return maxProcs
	}
	return numCPU
}
