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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"
// Breakpoint executes a breakpoint trap.
func Breakpoint()
// LockOSThread wires the calling goroutine to its current operating system thread.
// Until the calling goroutine exits or calls UnlockOSThread, it will always
// execute in that thread, and no other goroutine can.
func LockOSThread()
// UnlockOSThread unwires the calling goroutine from its fixed operating system thread.
// If the calling goroutine has not called LockOSThread, UnlockOSThread is a no-op.
func UnlockOSThread()
// 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 {
g := getg()
g.m.scalararg[0] = uintptr(n)
onM(gomaxprocs_m)
n = int(g.m.scalararg[0])
g.m.scalararg[0] = 0
return n
}
func gomaxprocs_m() // proc.c
// 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())
}
func gcount() int32
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