You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: runtime_unix_test.go
    path of file: ./repos/gccrs/libgo/go/runtime
    
    the code of the file until where you have to start completion: // Copyright 2013 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.

// Only works on systems with syscall.Close.
// We need a fast system call to provoke the race,
// and Close(-1) is nearly universally fast.

//go:build aix || darwin || dragonfly || freebsd || hurd || linux || netbsd || openbsd || plan9

package runtime_test

import (
	"runtime"
	"sync"
	"sync/atomic"
    
func TestGoroutineProfile(t *testing.T) {
	// GoroutineProfile used to use the wrong starting sp for
	// goroutines coming out of system calls, causing possible
	// crashes.
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(100))

	var stop uint32
	defer atomic.StoreUint32(&stop, 1) // in case of panic

	var wg sync.WaitGroup
	for i := 0; i < 4; i++ {
		wg.Add(1)
		go func() {
			for atomic.LoadUint32(&stop) == 0 {
				syscall.Close(-1)
			}
			wg.Done()
		}()
	}

	max := 10000
	if testing.Short() {
		max = 100
	}
	stk := make([]runtime.StackRecord, 128)
	for n := 0; n < max; n++ {
		_, ok := runtime.GoroutineProfile(stk)
		if !ok {
			t.Fatalf("GoroutineProfile failed")
		}
	}

	// If the program didn't crash, we passed.
	atomic.StoreUint32(&stop, 1)
	wg.Wait()
}