Defining TEVENT_NUM_SIGNALS as (2 * SIGRTMIN) so that SIGNAL-based AIO handling on FreeBSD works

[Richard Sharpe]

On Mon, Dec 3, 2012 at 11:41 AM, Jeremy Allison <jra at samba.org> wrote:
> On Fri, Nov 30, 2012 at 03:06:18PM -0800, Richard Sharpe wrote:
>> Hi folks,
>>
>> I am canvassing opinions on whether there is a better way to do this.
>>
>> Currently, the default AIO stuff in Samba does not work on FreeBSD
>> because TEVENT_NUM_SIGNALS is set to 64 and there is a check to see
>> that the signal number used by the AIO stuff does not exceed this
>> number.
>>
>> However, if RT_SIGNAL_AIO Is not set, then:
>>
>> /* The signal we'll use to signify aio done. */
>> #ifndef RT_SIGNAL_AIO
>> #define RT_SIGNAL_AIO   (SIGRTMIN+3)
>> #endif
>>
>> in source3/smbd/aio.c but on FreeBSD
>>
>> /usr/include/sys/signal.h:#define       SIGRTMIN        65
>>
>> So, things do not work.
>>
>> One solution is to define TEVENT_NUM_SIGNALS as 2 * SIGRTMIN ...
>>
>> On Linux SIGRTMIN is 32.
>>
>> Can anyone suggest a better fix?
>
> Took a quick look at this and at least on Linux there's
>
> #define SIGRTMAX
>
> which looks like it might be part of the POSIX-RT standard.
>
> Is this defined on *BSD ? If so, what is it defined to ?

/usr/include/sys/signal.h
...
#define SIGRTMIN        65
#define SIGRTMAX        126
...

-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)