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// Copyright 2022 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.

//go:build unix

package runtime

// retryOnEAGAIN retries a function until it does not return EAGAIN.
// It will use an increasing delay between calls, and retry up to 20 times.
// The function argument is expected to return an errno value,
// and retryOnEAGAIN will return any errno value other than EAGAIN.
// If all retries return EAGAIN, then retryOnEAGAIN will return EAGAIN.
func retryOnEAGAIN(fn func() int32) int32 {
	for tries := 0; tries < 20; tries++ {
		errno := fn()
		if errno != _EAGAIN {
			return errno
		}
		usleep_no_g(uint32(tries+1) * 1000) // milliseconds
	}
	return _EAGAIN
}