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os: document File's concurrent operation resource limits
Document that *os.File is subject to resource limits for concurrent operations. We aren't documenting a specific number of concurrent operations because that number is OS/system dependent. This limit comes from: internal/poll/fd_mutex.go where we use 20 bits to count locks. Fixes #32544 Change-Id: I7d305d4aaba5b2dbc6f1ab8c447117fde5e31a66 Reviewed-on: https://go-review.googlesource.com/c/go/+/181841 Reviewed-by: Rob Pike <r@golang.org>
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@ -34,6 +34,10 @@
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// }
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// fmt.Printf("read %d bytes: %q\n", count, data[:count])
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//
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// Note: The maximum number of concurrent operations on a File may be limited by
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// the OS or the system. The number should be high, but exceeding it may degrade
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// performance or cause other issues.
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//
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package os
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import (
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