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8743198152
I structured the test for issue54343.go after issue46725.go, where I was careful to use `[4]int`, which is a type large enough to avoid the tiny object allocator (which interferes with finalizer semantics). But in that test, I didn't note the importance of that type, so I mistakenly used just `int` in issue54343.go. This CL switches issue54343.go to use `[4]int` too, and then adds comments to both pointing out the significance of this type. Updates #54343. Change-Id: I699b3e64b844ff6d8438bbcb4d1935615a6d8cc4 Reviewed-on: https://go-review.googlesource.com/c/go/+/423115 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: David Chase <drchase@google.com>
46 lines
695 B
Go
46 lines
695 B
Go
// run
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "runtime"
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func main() {
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if wait() {
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panic("GC'd early")
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}
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m = nil
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if !wait() {
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panic("never GC'd")
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}
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}
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var m = New[int]().M
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func New[X any]() *T[X] {
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p := new(T[X])
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runtime.SetFinalizer(p, func(*T[X]) { close(done) })
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return p
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}
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type T[X any] [4]int // N.B., [4]int avoids runtime's tiny object allocator
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func (*T[X]) M() {}
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var done = make(chan int)
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func wait() bool {
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for i := 0; i < 10; i++ {
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runtime.GC()
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select {
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case <-done:
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return true
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default:
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}
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}
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return false
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}
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