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go spec: minor clarification on channel types
No language change. R=r, rsc, iant, ken2, r2 CC=golang-dev https://golang.org/cl/4168050
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<!-- title The Go Programming Language Specification -->
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<!-- subtitle Version of February 8, 2011 -->
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<!-- subtitle Version of February 15, 2011 -->
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<!--
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TODO
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@ -1227,9 +1227,11 @@ make(chan int, 100)
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<p>
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The capacity, in number of elements, sets the size of the buffer in the channel. If the
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capacity is greater than zero, the channel is asynchronous: provided the
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buffer is not full, sends can succeed without blocking. If the capacity is zero
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or absent, the communication succeeds only when both a sender and receiver are ready.
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capacity is greater than zero, the channel is asynchronous: communication operations
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succeed without blocking if the buffer is not full (sends) or not empty (receives),
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and elements are received in the order they are sent.
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If the capacity is zero or absent, the communication succeeds only when both a sender and
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receiver are ready.
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</p>
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<p>
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