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// Copyright 2021 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 poll_test import ( "internal/poll" "runtime" "sync" "sync/atomic" "testing" "time" ) var closeHook atomic.Value // func(fd int) func init() { closeFunc := poll.CloseFunc poll.CloseFunc = func(fd int) (err error) { if v := closeHook.Load(); v != nil { if hook := v.(func(int)); hook != nil { hook(fd) } } return closeFunc(fd) } } func TestSplicePipePool(t *testing.T) { const N = 64 var ( p *poll.SplicePipe ps []*poll.SplicePipe allFDs []int pendingFDs sync.Map // fd → struct{}{} err error ) closeHook.Store(func(fd int) { pendingFDs.Delete(fd) }) t.Cleanup(func() { closeHook.Store((func(int))(nil)) }) for i := 0; i < N; i++ { p, _, err = poll.GetPipe() if err != nil { t.Skipf("failed to create pipe due to error(%v), skip this test", err) } _, pwfd := poll.GetPipeFds(p) allFDs = append(allFDs, pwfd) pendingFDs.Store(pwfd, struct{}{}) ps = append(ps, p) } for _, p = range ps { poll.PutPipe(p) } ps = nil p = nil // Exploit the timeout of "go test" as a timer for the subsequent verification. timeout := 5 * time.Minute if deadline, ok := t.Deadline(); ok { timeout = deadline.Sub(time.Now()) timeout -= timeout / 10 // Leave 10% headroom for cleanup. } expiredTime := time.NewTimer(timeout) defer expiredTime.Stop() // Trigger garbage collection repeatedly, waiting for all pipes in sync.Pool // to either be deallocated and closed, or to time out. for { runtime.GC() time.Sleep(10 * time.Millisecond) // Detect whether all pipes are closed properly. var leakedFDs []int pendingFDs.Range(func(k, v any) bool { leakedFDs = append(leakedFDs, k.(int)) return true }) if len(leakedFDs) == 0 { break } select { case <-expiredTime.C: t.Logf("all descriptors: %v", allFDs) t.Fatalf("leaked descriptors: %v", leakedFDs) default: } } } func BenchmarkSplicePipe(b *testing.B) { b.Run("SplicePipeWithPool", func(b *testing.B) { for i := 0; i < b.N; i++ { p, _, err := poll.GetPipe() if err != nil { continue } poll.PutPipe(p) } }) b.Run("SplicePipeWithoutPool", func(b *testing.B) { for i := 0; i < b.N; i++ { p := poll.NewPipe() if p == nil { b.Skip("newPipe returned nil") } poll.DestroyPipe(p) } }) } func BenchmarkSplicePipePoolParallel(b *testing.B) { b.RunParallel(func(pb *testing.PB) { for pb.Next() { p, _, err := poll.GetPipe() if err != nil { continue } poll.PutPipe(p) } }) } func BenchmarkSplicePipeNativeParallel(b *testing.B) { b.RunParallel(func(pb *testing.PB) { for pb.Next() { p := poll.NewPipe() if p == nil { b.Skip("newPipe returned nil") } poll.DestroyPipe(p) } }) }