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: cgo.go
    path of file: ./repos/gccrs/libgo/go/runtime/testdata/testprogcgo
    
    the code of the file until where you have to start completion: // Copyright 2015 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 main

/*
void foo1(void) {}
void foo2(void* p) {}
*/
import "C"
import (
	"fmt"
	"os"
	"runtime"
	"strconv"
	"time"
	"unsafe"
)

func init() {
	register("CgoSignalDeadlock", CgoSignalDeadlock)
	register("CgoTraceback", CgoTrace
    
func CgoSignalDeadlock() {
	runtime.GOMAXPROCS(100)
	ping := make(chan bool)
	go func() {
		for i := 0; ; i++ {
			runtime.Gosched()
			select {
			case done := <-ping:
				if done {
					ping <- true
					return
				}
				ping <- true
			default:
			}
			func() {
				defer func() {
					recover()
				}()
				var s *string
				*s = ""
				fmt.Printf("continued after expected panic\n")
			}()
		}
	}()
	time.Sleep(time.Millisecond)
	start := time.Now()
	var times []time.Duration
	n := 64
	if os.Getenv("RUNTIME_TEST_SHORT") != "" {
		n = 16
	}
	for i := 0; i < n; i++ {
		go func() {
			runtime.LockOSThread()
			select {}
		}()
		go func() {
			runtime.LockOSThread()
			select {}
		}()
		time.Sleep(time.Millisecond)
		ping <- false
		select {
		case <-ping:
			times = append(times, time.Since(start))
		case <-time.After(time.Second):
			fmt.Printf("HANG 1 %v\n", times)
			return
		}
	}
	ping <- true
	select {
	case <-ping:
	case <-time.After(time.Second):
		fmt.Printf("HANG 2 %v\n", times)
		return
	}
	fmt.Printf("OK\n")
}