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protect wg.Done from being called twice (#17075)
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@ -25,13 +25,16 @@ import (
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// PipeWriter is similar to io.PipeWriter with wait group
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type PipeWriter struct {
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*io.PipeWriter
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once sync.Once
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done func()
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}
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// CloseWithError close with supplied error the writer end.
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func (w *PipeWriter) CloseWithError(err error) error {
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err = w.PipeWriter.CloseWithError(err)
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w.done()
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w.once.Do(func() {
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w.done()
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})
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return err
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}
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