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fixes #4746

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This commit is contained in:
Andreas Rumpf 2016-09-24 02:27:04 +02:00
commit 2569a58f08
1 changed files with 4 additions and 2 deletions
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6
lib/system/channels.nim
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@ -242,8 +242,10 @@ proc recv*[TMsg](c: var Channel[TMsg]): TMsg =
proc tryRecv*[TMsg](c: var Channel[TMsg]): tuple[dataAvailable: bool, proc tryRecv*[TMsg](c: var Channel[TMsg]): tuple[dataAvailable: bool,
msg: TMsg] = msg: TMsg] =
## try to receives a message from the channel `c` if available. Otherwise ## try to receives a message from the channel `c`, but this can fail
## it returns ``(false, default(msg))``. ## for all sort of reasons, including contention. If it fails,
## it returns ``(false, default(msg))`` otherwise it
## returns ``(true, msg)``.
var q = cast[PRawChannel](addr(c)) var q = cast[PRawChannel](addr(c))
if q.mask != ChannelDeadMask: if q.mask != ChannelDeadMask:
if tryAcquireSys(q.lock): if tryAcquireSys(q.lock):