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// 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 "unsafe"
// 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 n > _MaxGomaxprocs {
n = _MaxGomaxprocs
}
lock(&sched.lock)
ret := int(gomaxprocs)
unlock(&sched.lock)
if n <= 0 || n == ret {
return ret
}
semacquire(&worldsema, false)
gp := getg()
gp.m.gcing = 1
systemstack(stoptheworld)
// newprocs will be processed by starttheworld
newprocs = int32(n)
gp.m.gcing = 0
semrelease(&worldsema)
systemstack(starttheworld)
return ret
}
// NumCPU returns the number of logical CPUs on the local machine.
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)(atomicloadp(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())
}
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