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runtime: correct Note documentation
Reflect the fact that notesleep() can be called by exactly one thread. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/4816064
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@ -521,10 +521,13 @@ void runtime·destroylock(Lock*);
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* sleep and wakeup on one-time events.
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* before any calls to notesleep or notewakeup,
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* must call noteclear to initialize the Note.
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* then, any number of threads can call notesleep
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* then, exactly one thread can call notesleep
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* and exactly one thread can call notewakeup (once).
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* once notewakeup has been called, all the notesleeps
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* will return. future notesleeps will return immediately.
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* once notewakeup has been called, the notesleep
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* will return. future notesleep will return immediately.
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* subsequent noteclear must be called only after
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* previous notesleep has returned, e.g. it's disallowed
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* to call noteclear straight after notewakeup.
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*/
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void runtime·noteclear(Note*);
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void runtime·notesleep(Note*);
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