github.com/kelleygo/clashcore@v1.0.2/common/once/once_go122.go (about)

     1  //go:build go1.22
     2  
     3  package once
     4  
     5  import (
     6  	"sync"
     7  	"sync/atomic"
     8  	"unsafe"
     9  )
    10  
    11  type Once struct {
    12  	done atomic.Uint32
    13  	m    sync.Mutex
    14  }
    15  
    16  func Done(once *sync.Once) bool {
    17  	// atomic visit sync.Once.done
    18  	return (*atomic.Uint32)(unsafe.Pointer(once)).Load() == 1
    19  }
    20  
    21  func Reset(once *sync.Once) {
    22  	o := (*Once)(unsafe.Pointer(once))
    23  	o.m.Lock()
    24  	defer o.m.Unlock()
    25  	o.done.Store(0)
    26  }