// accurate reporting of its CPU usage; see issue 35057) and ignore any
		// that it gets from the process-wide setitimer (to not over-count its
		// CPU consumption).
		return timer_create
	}

	// No active per-thread timer means the only valid profiler is setitimer.
	return setitimer
}

func setProcessCPUProfiler(hz int32) {
	setProcessCPUProfilerTimer(hz)
}

	errno = libcCall(unsafe.Pointer(abi.FuncPCABI0(pipe2_trampoline)), unsafe.Pointer(&args))
	return p[0], p[1], errno
}
func pipe2_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func setitimer(mode int32, new, old *itimerval) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(setitimer_trampoline)), unsafe.Pointer(&mode))
	KeepAlive(new)
	KeepAlive(old)
}
func setitimer_trampoline()

//go:nosplit

	n := sigset(0)
	if new != nil {
		n = *new
	}
	r := obsdsigprocmask(how, n)
	if old != nil {
		*old = r
	}
}

func pipe2(flags int32) (r, w int32, errno int32)

//go:noescape
func setitimer(mode int32, new, old *itimerval)

//go:noescape
func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32

// mmap calls the mmap system call. It is implemented in assembly.

//go:cgo_import_dynamic libc_sem_post sem_post "libc.so"
//go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so"
//go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
//go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
//go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
//go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"
//go:cgo_import_dynamic libc_sigprocmask sigprocmask "libc.so"

	}
}

// A value which may be passed to the which parameter for Getitimer and
// Setitimer.
type ItimerWhich int

// Possible which values for Getitimer and Setitimer.
const (
	ItimerReal    ItimerWhich = ITIMER_REAL
	ItimerVirtual ItimerWhich = ITIMER_VIRTUAL
	ItimerProf    ItimerWhich = ITIMER_PROF
)

// Getitimer wraps getitimer(2) to return the current value of the timer
// specified by which.

//go:cgo_unsafe_args
func raiseproc(sig uint32) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(raiseproc_trampoline)), unsafe.Pointer(&sig))
}
func raiseproc_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func setitimer(mode int32, new, old *itimerval) {
	libcCall(unsafe.Pointer(abi.FuncPCABI0(setitimer_trampoline)), unsafe.Pointer(&mode))
	KeepAlive(new)
	KeepAlive(old)
}
func setitimer_trampoline()

//go:nosplit

	// From NetBSD's <sys/ucontext.h>
	_UC_SIGMASK = 0x01
	_UC_CPU     = 0x04

	// From <sys/lwp.h>
	_LWP_DETACHED = 0x00000040
)

type mOS struct {
	waitsemacount uint32
}

//go:noescape
func setitimer(mode int32, new, old *itimerval)

//go:noescape
func sigaction(sig uint32, new, old *sigactiont)

//go:noescape
func sigaltstack(new, old *stackt)

//go:noescape
func sigprocmask(how int32, new, old *sigset)

			setsig(_SIGPROF, abi.FuncPCABIInternal(sighandler))
		}

		var it itimerval
		it.it_interval.tv_sec = 0
		it.it_interval.set_usec(1000000 / hz)
		it.it_value = it.it_interval
		setitimer(_ITIMER_PROF, &it, nil)
	} else {
		setitimer(_ITIMER_PROF, &itimerval{}, nil)

		// If the Go signal handler should be disabled by default,
		// switch back to the signal handler that was installed

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func getitimer(which int, currValue *Itimerval) (err error) {
	_, _, e1 := Syscall(SYS_GETITIMER, uintptr(which), uintptr(unsafe.Pointer(currValue)), 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func setitimer(which int, newValue *Itimerval, oldValue *Itimerval) (err error) {

        when:
        setTime(51243)

        then:
        timer.getElapsed() == "51.243 secs"
    }

    def testOnlySecondsEvenMs() {
        when:
        setTime(4000)

        then:
        timer.getElapsed() == "4.0 secs"
    }

    def testMinutesAndSeconds() {
        when:
        setTime(0, 32, 40, 322)

        then: