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Subject: Re: Arbitrary limit on timeouts?
From: Michael Davidsaver <mdavidsaver@gmail.com>
To: Eric Norum <wenorum@lbl.gov>
Cc: EPICS mailing list <tech-talk@aps.anl.gov>
Date: Wed, 7 Jun 2017 19:38:38 +0200
On 06/07/2017 06:50 PM, Eric Norum wrote:
> Why are timeouts for things like epicsEventWaitWithTImeout() limited to
> 1 hour?
> This is for R3.15.4, but I suspect the code is the same in lots of versions.

Since at least 2000 (first occurrence I find).  The commit message
doesn't give any clues.

https://github.com/epics-base/epics-base/commit/8c60195f4b463bff42f6f967da8bc19d6f5ad11d#diff-583652b37e7f98cf7b720e489744ce88R57

Seems rather arbitrary, so I think this could be removed (or enlarged).



> The code that applies the limit is in src/libCom/osi/os/posix/osdTime.cpp:
> 
>     extern "C" epicsShareFunc void
>         convertDoubleToWakeTime(double timeout,struct timespec *wakeTime)
>     {
>         struct timespec wait;
>         int status;
> 
>         if(timeout<0.0) timeout = 0.0;
>         else if(timeout>3600.0) timeout = 3600.0;
>     #ifdef CLOCK_REALTIME
>         status = clock_gettime(CLOCK_REALTIME, wakeTime);
>     #else
>         {
>     . . .
> 
> 
> 
> 
> -- 
> Eric Norum
> wenorum@lbl.gov <mailto:wenorum@lbl.gov>
> 


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