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magicsock: add description of testClosingContext
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
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@ -543,6 +543,11 @@ func TestDeviceStartStop(t *testing.T) {
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dev.Close()
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}
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// A context used in TestConnClosing() which seeks to test that code which calls
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// Err() to see if a connection is already being closed does not then proceed to
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// try to acquire the mutex, as this would lead to deadlock. When Err() is called
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// this context acquires the lock itself, in order to force a deadlock (and test
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// failure on timeout).
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type testConnClosingContext struct {
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parent context.Context
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mu *sync.Mutex
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