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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"
"internal/syscall/unix"
"runtime"
"syscall"
"testing"
"time"
)
// checkPipes returns true if all pipes are closed properly, false otherwise.
func checkPipes(fds []int) bool {
for _, fd := range fds {
// Check if each pipe fd has been closed.
_, _, errno := syscall.Syscall(unix.FcntlSyscall, uintptr(fd), syscall.F_GETPIPE_SZ, 0)
if errno == 0 {
return false
}
}
return true
}
func TestSplicePipePool(t *testing.T) {
const N = 64
var (
p *poll.SplicePipe
ps []*poll.SplicePipe
fds []int
err error
)
for i := 0; i < N; i++ {
p, _, err = poll.GetPipe()
if err != nil {
t.Skip("failed to create pipe, skip this test")
}
_, pwfd := poll.GetPipeFds(p)
fds = append(fds, pwfd)
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)
if checkPipes(fds) {
break
}
select {
case <-expiredTime.C:
t.Fatal("at least one pipe is still open")
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)
}
})
}
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