mirror of
https://github.com/golang/go
synced 2024-11-17 03:24:49 -07:00
231f290e51
So iterators that are in progress can know entries have been deleted and terminate the iterator properly. Update #55002 Update #56351 Fixes #59411 Change-Id: I924f16a00fe4ed6564f730a677348a6011d3fb67 Reviewed-on: https://go-review.googlesource.com/c/go/+/481935 Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Keith Randall <khr@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
78 lines
1.3 KiB
Go
78 lines
1.3 KiB
Go
// run
|
|
|
|
// Copyright 2023 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
|
|
|
|
import (
|
|
"math"
|
|
"reflect"
|
|
)
|
|
|
|
func main() {
|
|
for i := 0; i < 100; i++ {
|
|
f()
|
|
g()
|
|
}
|
|
}
|
|
|
|
func f() {
|
|
// Allocate map.
|
|
m := map[float64]int{}
|
|
// Fill to just before a growth trigger.
|
|
const N = 13 << 4 // 6.5 * 2 * 2^k
|
|
for i := 0; i < N; i++ {
|
|
m[math.NaN()] = i
|
|
}
|
|
// Trigger growth.
|
|
m[math.NaN()] = N
|
|
|
|
// Iterate through map.
|
|
i := 0
|
|
for range m {
|
|
if i == 6 {
|
|
// Partway through iteration, clear the map.
|
|
clear(m)
|
|
} else if i > 6 {
|
|
// If we advance to the next iteration, that's a bug.
|
|
panic("BAD")
|
|
}
|
|
i++
|
|
}
|
|
if len(m) != 0 {
|
|
panic("clear did not empty the map")
|
|
}
|
|
}
|
|
|
|
func g() {
|
|
// Allocate map.
|
|
m := map[float64]int{}
|
|
// Fill to just before a growth trigger.
|
|
const N = 13 << 4 // 6.5 * 2 * 2^k
|
|
for i := 0; i < N; i++ {
|
|
m[math.NaN()] = i
|
|
}
|
|
// Trigger growth.
|
|
m[math.NaN()] = N
|
|
|
|
// Iterate through map.
|
|
i := 0
|
|
v := reflect.ValueOf(m)
|
|
iter := v.MapRange()
|
|
for iter.Next() {
|
|
if i == 6 {
|
|
// Partway through iteration, clear the map.
|
|
v.Clear()
|
|
} else if i > 6 {
|
|
// If we advance to the next iteration, that's a bug.
|
|
panic("BAD")
|
|
}
|
|
i++
|
|
}
|
|
if v.Len() != 0 {
|
|
panic("clear did not empty the map")
|
|
}
|
|
}
|