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sync/channels: expose ch.closed as bool pseudo attribute (#8244)

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Uwe Krüger
2021-01-22 08:37:29 +01:00
committed by GitHub
parent 820e684313
commit 925ffd76f4
5 changed files with 50 additions and 43 deletions
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doc/docs.md
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@ -2484,6 +2484,7 @@ res := ch.try_push(a) // try to perform `ch <- a`
println(res)
l := ch.len // number of elements in queue
c := ch.cap // maximum queue length
is_closed := ch.closed // bool flag - has `ch` been closed
println(l)
println(c)
mut b := Abc{}
@ -2495,7 +2496,10 @@ The `try_push/pop()` methods will return immediately with one of the results
`.success`, `.not_ready` or `.closed` - dependent on whether the object has been transferred or
the reason why not.
Usage of these methods and properties in production is not recommended -
algorithms based on them are often subject to race conditions. Use `select` instead.
algorithms based on them are often subject to race conditions. Especially `.len` and
`.closed` should not be used to make decisions.
Use `or` branches, error propagation or `select` instead (see [Syntax and Usage](#syntax-and-usage)
and [Channel Select](#channel-select) above).
### Shared Objects