371eda4558
In the distant past, Pipe was implemented with channels and a long running pipe.run goroutine (see CL 994043). This approach of having all communication serialized through the run method was error prone giving Pipe a history of deadlocks and race conditions. After the introduction of sync.Cond, the implementation was rewritten (see CL 4252057) to use condition variables and avoid the long running pipe.run goroutine. While this implementation is superior to the previous one, this implementation is strange in that the p.data field is always set immediately prior to signaling the other goroutine with Cond.Signal, effectively making the combination of the two a channel-like operation. Inferior to a channel, however, this still requires explicit locking around the p.data field. The data+rwait can be effectively be replaced by a "chan []byte" to inform a reader that there is data available. The data+wwait can be effectively be replaced by a "chan int" to inform a writer of how many bytes were read. This implementation is a simplified from net.Pipe in CL 37402. Change-Id: Ia5b26320b0525934fd87a3b69a091c787167f5aa Reviewed-on: https://go-review.googlesource.com/65330 Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> |
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The Go Programming Language
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