Jafar, First, thanks so much for taking the time to put together your sketch for a solution to the problem of creating a timer using loadfunc and a call to setitimer. It really helped refresh my memory about how things were done with loadfunc without having to resort to reading the tech report.
Unfortunately, I think I have uncovered a bug or at least a limitation in the implementation. When I run the solution you posted it will work for a few cycles printing "fire timer" but eventually will abort. The number of cycles before it breaks is indeterminate, sometimes as few as 3 sometimes as many as 40 or so. The version and features I am running reports Running Unicon Version 13.0 alpha. Oct 1, 2015 UNIX POSIX DBM ASCII co-expressions dynamic loading environment variables event monitoring external functions keyboard functions large integers multiple programs pattern type pipes pseudo terminals system function messaging libz file compression PNG images SQL via ODBC CCompiler gcc 5.4.0 Physical memory: 4142153728 bytes Revision Arch x86_64 CPU cores 2 I tried various rearrangements of things to try to determine where the problem might be and to try to find a possible work-around. Some of them seem to consistently run for more cycles of the timer before dying but will eventually die. I can post all my various approaches and test run results if it would be of interest. If you do not see this behavior on your system, please let me know so I can try to determine what is possibly not installed properly on my setup. Michael Meehan mee...@wwu.edu for work-related items only jmichaelmee...@gmail.com for non-work-related items only ________________________________________ From: Jafar Al-Gharaibeh <to.ja...@gmail.com> Sent: Thursday, November 10, 2016 10:14:10 PM To: Jeffery, Clint (jeffe...@uidaho.edu) Cc: Michael Meehan; Unicon group Subject: Re: [Unicon-group] SIGALRM Michael, I had 15 minutes this evening to quickly hack a draft solution for you. I posted it on Unicon's discussion page: https://sourceforge.net/p/unicon/discussion/contributions/thread/db34541b/ Regards, Jafar On Thu, Nov 10, 2016 at 7:43 PM, Jeffery, Clint (jeffe...@uidaho.edu<mailto:jeffe...@uidaho.edu>) <jeffe...@uidaho.edu<mailto:jeffe...@uidaho.edu>> wrote: Hi Michael, Always nice to hear from a fellow Washingtonian. I am aware of various alarming things being done in Unicon before, but have not seen code of the sort you describe. It should be a great test of trap() and the posix facilities. In grepping for possible interactions, I noticed that the URL-reading code in the messaging facilities sets a SIGALRM handler to do a timeout when it attempts to connect to a web server, but as long as you are not simultaneously trying to open() things with mode "m" you should be OK. Cheers, Clint ----------------------------------------------------------------------------------------------------- MM> I'm writing a unicon program that needs to set a timer. Has anyone every written a c loadfunc for setitimer and/or getitime so that the unicon program can trap SIGALRM and know when the interval has expired. Thought I would check to see if anyone had already done it before trying to build it. #include <sys/time.h> int getitimer(int which, struct itimerval *curr_value); int setitimer(int which, const struct itimerval *new_value, struct itimerval *old_value); ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Unicon-group mailing list Unicon-group@lists.sourceforge.net<mailto:Unicon-group@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/unicon-group ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Unicon-group mailing list Unicon-group@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/unicon-group
