[Xenomai] [Xenomai-git] Philippe Gerum : cobalt/posix: drop pthread_make_periodic_np/ wait_period_np services

Philippe Gerum rpm at xenomai.org
Mon Jun 16 21:16:19 CEST 2014


On 06/16/2014 09:02 PM, Gilles Chanteperdrix wrote:
> On 06/16/2014 06:41 PM, git repository hosting wrote:
>> Module: xenomai-forge
>> Branch: next
>> Commit: a4a6ff9a9c9614d3e8ac860386fa3b168c649af0
>> URL:    http://git.xenomai.org/?p=xenomai-forge.git;a=commit;h=a4a6ff9a9c9614d3e8ac860386fa3b168c649af0
>>
>> Author: Philippe Gerum <rpm at xenomai.org>
>> Date:   Mon Jun 16 18:39:44 2014 +0200
>>
>> cobalt/posix: drop pthread_make_periodic_np/wait_period_np services
>>
>> We have no more in-tree users of these calls.
>>
>> With the introduction of services to support real-time signals, those
>> two non-portable calls have become redundant. Instead, Cobalt-based
>> applications should create a periodic timer using the timer_create()
>> call, and wait for release points via sigwaitinfo(), checking for
>> overruns by looking at the siginfo.si_overrun field.
>>
>> Alternatively, applications may include a timer source in a
>> synchronous multiplexing operation, by passing a file descriptor
>> returned by the timerfd() service to a select() call.
>
> Actually, read is more direct than select + read, and it allows to get
> the count of overruns too.
>
>

As mentioned in the log, the illustration given is about synchronous 
multiplexing, e.g. waiting for a release point in a timeline _and_ other 
I/O event at the same time, not about single-sourced wait on a timer. 
Otherwise you would just don't care a dime about using select(), I guess.

-- 
Philippe.




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