关于go:golang实现简单的可重入锁

package mainimport (    "fmt"    "github.com/petermattis/goid"    "sync"    "sync/atomic")// Go version: V1.21.0type ReentryMutex struct {     sync.Mutex     owner int64//以后锁的拥有者 goroutineid     reentry int32//重入次数}func (r *ReentryMutex)Lock(){    gid:=goid.Get()    //如果锁的拥有者曾经是以后goroutine，记录下他曾经重入的次数    if atomic.LoadInt64(&r.owner)==gid{        r.reentry++        return    }    r.Mutex.Lock()    atomic.StoreInt64(&r.owner,gid)    //初始化可拜访次数    r.reentry=1}func (r *ReentryMutex) Unlock(){    gid:=goid.Get()    //如果解锁协程不是以后协程的拥有者，就panic    if atomic.LoadInt64(&r.owner)!=gid{        panic(any(fmt.Sprintf("wrong the owner(%d): %d!",r.owner,gid)))    }    r.reentry--    if r.reentry==0{        atomic.StoreInt64(&r.owner,-1)        r.Mutex.Unlock()    }}func main() {    var wg sync.WaitGroup    reentryMutex:=ReentryMutex{}    for i := 0; i < 5; i++ {        wg.Add(1)        go func(index int) {            defer wg.Done()            reentryMutex.Lock()            defer reentryMutex.Unlock()            fmt.Printf("Goroutine %d acquired the lock.\n", index)            reentryMutex.Lock()            defer reentryMutex.Unlock()            fmt.Printf("Goroutine %d acquired the lock again.\n", index)        }(i)    }    wg.Wait()    fmt.Println("All goroutines have finished.")}