github.com/googgoog/go-ethereum@v1.9.7/log/handler_go13.go (about)

     1  // +build !go1.4
     2  
     3  package log
     4  
     5  import (
     6  	"sync/atomic"
     7  	"unsafe"
     8  )
     9  
    10  // swapHandler wraps another handler that may be swapped out
    11  // dynamically at runtime in a thread-safe fashion.
    12  type swapHandler struct {
    13  	handler unsafe.Pointer
    14  }
    15  
    16  func (h *swapHandler) Log(r *Record) error {
    17  	return h.Get().Log(r)
    18  }
    19  
    20  func (h *swapHandler) Get() Handler {
    21  	return *(*Handler)(atomic.LoadPointer(&h.handler))
    22  }
    23  
    24  func (h *swapHandler) Swap(newHandler Handler) {
    25  	atomic.StorePointer(&h.handler, unsafe.Pointer(&newHandler))
    26  }