Hi,
I got a panic when i run my test code
my go version is 'go version go1.12 linux/amd64'
panic: reflect: call of reflect.Value.Type on zero Value
goroutine 6 [running]:
reflect.Value.Type(0x0, 0x0, 0x0, 0x4db0c0, 0xc0000183d0)
/usr/local/go/src/reflect/value.go:1813 +0x169
internal/fmtsort.compare(0x0, 0x0, 0x0, 0x4e34c0, 0xc0000b8110, 0xb4, 0x1)
/usr/local/go/src/internal/fmtsort/sort.go:76 +0x5a
internal/fmtsort.(*SortedMap).Less(0xc0000c2000, 0x9, 0x8, 0x100c0000b8100)
/usr/local/go/src/internal/fmtsort/sort.go:27 +0x87
sort.insertionSort(0x525540, 0xc0000c2000, 0x0, 0xa)
/usr/local/go/src/sort/sort.go:27 +0xab
sort.stable(0x525540, 0xc0000c2000, 0xa)
/usr/local/go/src/sort/sort.go:368 +0x86
sort.Stable(0x525540, 0xc0000c2000)
/usr/local/go/src/sort/sort.go:357 +0x53
internal/fmtsort.Sort(0x4e3a00, 0xc000012678, 0x1b5, 0x20)
/usr/local/go/src/internal/fmtsort/sort.go:67 +0x2e3
fmt.(*pp).printValue(0xc0000b2000, 0x4e3a00, 0xc000012678, 0x1b5, 0x76, 0x2)
/usr/local/go/src/fmt/print.go:759 +0xd1d
fmt.(*pp).printValue(0xc0000b2000, 0x4eb220, 0xc000012670, 0x199,
0xc000000076, 0x1)
/usr/local/go/src/fmt/print.go:796 +0x1b52
fmt.(*pp).printValue(0xc0000b2000, 0x4f89e0, 0xc000012670, 0x16, 0x76, 0x0)
/usr/local/go/src/fmt/print.go:866 +0x199f
fmt.(*pp).printArg(0xc0000b2000, 0x4f89e0, 0xc000012670, 0x76)
/usr/local/go/src/fmt/print.go:702 +0x2ba
fmt.(*pp).doPrintln(0xc0000b2000, 0xc0000a9fa0, 0x2, 0x2)
/usr/local/go/src/fmt/print.go:1159 +0xb2
fmt.Fprintln(0x524b60, 0xc000010018, 0xc0000387a0, 0x2, 0x2, 0x0, 0x0, 0x0)
/usr/local/go/src/fmt/print.go:265 +0x58
fmt.Println(...)
/usr/local/go/src/fmt/print.go:275
main.testMapLock.func1(0xc000012670, 0xc000018350)
/home/lbs/go/src/demo/test/testmap/testmap.go:78 +0x95
created by main.testMapLock
/home/lbs/go/src/demo/test/testmap/testmap.go:77 +0xfa
Piece of my code:
//ForEach range all the node in map and call the handler and then delete
the node if the handler return true
func (em *EMSmap) ForEachRemove ( h DoEachNode ,userData interface{}){
em.m.Lock()
defer em.m.Unlock()
for key,value := range em.emap{
userData := userData
if b := h(key, value, userData);b{
delete(em.emap, key)
}
}
}
//FindAndRemove store the node in a temporary var and then delete it from
the map and return the node which stored in the temporary var
func (em *EMSmap) FindAndRemove (key interface{}) interface{}{
em.m.Lock()
defer em.m.Unlock()
if _,ok := em.emap[key]; !ok{
return nil
}
value := em.emap[key]
delete(em.emap, key)
return value
}
func testMapLock(){
var callMap *emsutil.EMSmap = context.CallMap
var wgt sync.WaitGroup
for i := 0; i < 10; i++{
callMap.Put(i, i)
}
wgt.Add(2)
go func(){
fmt.Println("ForEachRemove",callMap)
time.Sleep(time.Duration(10)*time.Millisecond)
callMap.ForEachRemove(func (key interface{}, value interface{}, userData
interface{})bool{
fmt.Println("delete by ForEachRemove",key,value)
time.Sleep(time.Duration(2)*time.Millisecond)
return true}, nil)
wgt.Done()
}()
go func(){
fmt.Println("FindAndRemove",callMap)
for i := 0; i < 10; i++{
val := callMap.FindAndRemove(i)
fmt.Println("delete by for FindAndRemove",val)
time.Sleep(time.Duration(2)*time.Millisecond)
}
wgt.Done()
}()
wgt.Wait()
wg.Done()
}
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