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doc/go1.14: mention increased number of EINTR errors
Updates #36281 Change-Id: I3c4487caaf47566212dc62322b2e884e695ea7f1 Reviewed-on: https://go-review.googlesource.com/c/go/+/212657 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -258,6 +258,23 @@ TODO
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<code>plan9/*</code>.
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</p>
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<p>
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A consequence of the implementation of preemption is that on Unix
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systems, including Linux and macOS systems, programs built with Go
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1.14 will receive more signals than programs built with earlier
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releases.
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This means that programs that use packages
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like <a href="/pkg/syscall/"><code>syscall</code></a>
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or <a href="https://godoc.org/golang.org/x/sys/unix"><code>golang.org/x/sys/unix</code></a>
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will see more slow system calls fail with <code>EINTR</code> errors.
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Those programs will have to handle those errors in some way, most
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likely looping to try the system call again. For more
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information about this
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see <a href="http://man7.org/linux/man-pages/man7/signal.7.html"><code>man
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7 signal</code></a> for Linux systems or similar documentation for
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other systems.
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</p>
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<p><!-- CL 201765, CL 195701 and many others -->
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The page allocator is more efficient and incurs significantly less
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lock contention at high values of <code>GOMAXPROCS</code>.
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