Poking around the golang's net/http I came across this thing.
var (
bufioReaderPool sync.Pool
bufioWriter2kPool sync.Pool
bufioWriter4kPool sync.Pool
)
...
func newBufioReader(r io.Reader) *bufio.Reader {
if v := bufioReaderPool.Get(); v != nil {
br := v.(*bufio.Reader)
br.Reset(r)
return br
}
// Note: if this reader size is ever changed, update
// TestHandlerBodyClose's assumptions.
return bufio.NewReader(r)
}
func putBufioReader(br *bufio.Reader) {
br.Reset(nil)
bufioReaderPool.Put(br)
}
github link
<https://github.com/golang/go/blob/master/src/net/http/server.go#L814-L822>
There seems to be bufioReaderPool variable which is never initialized with
the sync.Pool's New method. newBufioReader function is using that pool, but
all the bufio.NewReaders are always being allocated and they are not being
reused.
What is the intended behaviour here?
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