blob: 1202e362a5aaddf866d00c8ea8f3c2460974c3b1 [file] [log] [blame]
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
// GOMAXPROCS sets the maximum number of CPUs that can be executing
// simultaneously and returns the previous setting. If n < 1, it does not
// change the current setting.
// The number of logical CPUs on the local machine can be queried with NumCPU.
// This call will go away when the scheduler improves.
func GOMAXPROCS(n int) int {
if GOARCH == "wasm" && n > 1 {
n = 1 // WebAssembly has no threads yet, so only one CPU is possible.
ret := int(gomaxprocs)
if n <= 0 || n == ret {
return ret
// newprocs will be processed by startTheWorld
newprocs = int32(n)
return ret
// NumCPU returns the number of logical CPUs usable by the current process.
// The set of available CPUs is checked by querying the operating system
// at process startup. Changes to operating system CPU allocation after
// process startup are not reflected.
func NumCPU() int {
return int(ncpu)
// NumCgoCall returns the number of cgo calls made by the current process.
func NumCgoCall() int64 {
var n int64
for mp := (*m)(atomic.Loadp(unsafe.Pointer(&allm))); mp != nil; mp = mp.alllink {
n += int64(mp.ncgocall)
return n
// NumGoroutine returns the number of goroutines that currently exist.
func NumGoroutine() int {
return int(gcount())
// Get field tracking information. Only fields with a tag go:"track"
// are tracked. This function will add every such field that is
// referenced to the map. The keys in the map will be
// PkgPath.Name.FieldName. The value will be true for each field
// added.
func Fieldtrack(map[string]bool)
//go:linkname debug_modinfo runtime..z2fdebug.modinfo
func debug_modinfo() string {
return modinfo
// setmodinfo is visible to code generated by cmd/go/internal/modload.ModInfoProg.
//go:linkname setmodinfo runtime.setmodinfo
func setmodinfo(s string) {
modinfo = s