Implement non-blocking select statements #402
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Ready for conflict resolution, please. |
This may have a small effect on code size sometimes, but will simplify the implementation of the select statement.
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Rebased. |
deadprogram
reviewed
Jun 12, 2019
src/runtime/chan.go
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| // perhaps the most complicated statement in the Go spec. It returns the | ||
| // selected index and the 'comma-ok' value. | ||
| // | ||
| // TODO: do this in a round-robin fashin (as specified in the Go spec) instead |
deadprogram
reviewed
Jun 12, 2019
src/runtime/chan.go
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| // A receive operation. | ||
| switch state.ch.state { | ||
| case chanStateSend: | ||
| println(" state send") |
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deadprogram
reviewed
Jun 12, 2019
src/runtime/chan.go
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| } | ||
| return uintptr(i), true // commaOk = true | ||
| case chanStateClosed: | ||
| println(" state closed") |
deadprogram
reviewed
Jun 12, 2019
| const ( | ||
| chanStateEmpty = iota | ||
| chanStateEmpty chanState = iota |
Blocking selects are much more complicated, so let's do non-blocking ones first.
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Oh that was really sloppy of me, thanks for checking. Fixed now. |
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The test is flaky, re-running now. |
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IMO this is a very big leap forward in one of the few missing language features. Great work! |
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Non-blocking selects are much easier to implement, so let's do that first. It should get a bit more code to compile as well (but not necessarily to run well). It depends on #401 because there would be merge conflicts otherwise.
And yes, this is also part of #285 because the time package contains a select that used to be not compiled but will be with that refactor.