[Asterisk-Dev] Is the ChanIsAvail command thread safe?

[hugolivude]

Thanks Kevin. It doesn't seem that it would be very useful to use 
ChanIsAvail in a dial plan to determine which line to use because a line 
that tests as AVAILABLE could get snatched by another user before it can get 
used. Am I right or have I missed something?

Thanks,
Hugh 

On 9/13/05, Kevin P. Fleming <kpfleming at digium.com> wrote:
> 
> hugolivude wrote:
> > Curious whether the ChanIsAvail command is thread safe. By that I mean, 
> if I
> > use ChanIsAvail to determine which channel to use, can I be sure that it
> > will still be available when I go to Dial it on the next line? It occurs 
> to
> > me that there's a possibility the channel could get used by a competing
> > thread AFTER my thread has determined it is available and BEFORE my 
> thread
> > gets a chance to Dial.
> 
> This has nothing to do with 'thread safety' at all, please don't mis-use
> terminology.
> 
> The simple answer to your question is no. ChanIsAvail only tells you
> whether the channel is available, it does not make any attempt to 'lock'
> it for your use.
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