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Top Forums Programming Signal Handling and Context Switches Post 302262201 by XComp on Wednesday 26th of November 2008 02:57:05 PM
Old 11-26-2008
Slightly different behaviour

So I've tested it on a OpenSuse machine. And there it behaves a little bit different. Instead of finishing there will be raised a segmentation fault. Here is the sample output for UPPER_BOUND = 500000000 and 500 ms intveral:

Ubuntu and VMWare:
Code:
[Main Function]        Program starts...
[Main Function]        scheduler_context was initialized...
[Main Function]        thread_context was initialized...
[Main Function]        The timer was initialized...
[Scheduler Function] Scheduler starts...
[Thread Function]      Function starts...
[Signal Handler]         SIGPROF was raised at 59902313...
[Scheduler Function ] Swap back is done...
[Thread Function]       Error: 1st counting didn't finished (59902313)...
[Signal Handler]         SIGPROF was raised at 58254699...
[Scheduler Function]   Swap back is done...
[Signal Handler]          SIGPROF was raised at 115562955...
[Scheduler Function]   Swap back is done...
[Thread Function]        Error: 2nd counting didn't finished (115562955)...
[Thread Function]        Function finishes...
[Scheduler Function]    Swap back is done...
[Scheduler Function]    Scheduler finishes...

Code:
[Main Function]        Program starts...
[Main Function]        scheduler_context was initialized...
[Main Function]        thread_context was initialized...
[Main Function]        The timer was initialized...
[Scheduler Function] Scheduler starts...
[Thread Function]      Function starts...
[Signal Handler]        SIGPROF was raised at 98310059...
[Scheduler Function] Swap back is done...
[Signal Handler]        SIGPROF was raised at 295005103...
 [Scheduler Function] Swap back is done..
[Thread Function]      1st counting worked fine...
 [Signal Handler]        SIGPROF was raised at 36236813...
Segmentation fault

What could be the reason of this segmentation fault. Could it be raised because of some mistakes in initializing the alternative signal stack? Does anyone has a good source, which explains, what happens inside the OS, when a context is swapped or a signal is raised? I didn't find anything on the web... :/

Last edited by XComp; 11-26-2008 at 04:51 PM..
 

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Frame(3pm)						User Contributed Perl Documentation						Frame(3pm)

NAME
SVG::Frame - SVG::Frame object METHODS
new Title : new Usage : Function: Example : Returns : Args : init Title : init Usage : Function: Example : Returns : Args : add_glyph Title : add_glyph Usage : Function: Example : Returns : Args : add_group Title : add_group Usage : Function: Example : Returns : Args : groups Title : groups Usage : Function: Example : Returns : Args : add_data Title : add_data Usage : Function: Example : Returns : Args : all_data Title : all_data Usage : Function: Example : Returns : Args : data Title : data Usage : Function: Example : Returns : Args : glyphs Title : glyphs Usage : Function: Example : Returns : Args : data_chunks Title : data_chunks Usage : Function: Example : Returns : Args : draw Title : draw Usage : Function: Example : Returns : Args : _recalculate_stats Title : _recalculate_stats Usage : Function: Example : Returns : Args : _parent_svg Title : _parent_svg Usage : $obj->_parent_svg($newval) Function: Example : Returns : value of _parent_svg (a scalar) Args : on set, new value (a scalar or undef, optional) _parent_group Title : _parent_group Usage : $obj->_parent_group($newval) Function: Example : Returns : value of _parent_group (a scalar) Args : on set, new value (a scalar or undef, optional) svg Title : svg Usage : $obj->svg($newval) Function: Example : Returns : value of svg (a scalar) Args : on set, new value (a scalar or undef, optional) xsize Title : xsize Usage : $obj->xsize($newval) Function: Example : Returns : value of xsize (a scalar) Args : on set, new value (a scalar or undef, optional) ysize Title : ysize Usage : $obj->ysize($newval) Function: Example : Returns : value of ysize (a scalar) Args : on set, new value (a scalar or undef, optional) xoffset Title : xoffset Usage : $obj->xoffset($newval) Function: Example : Returns : value of xoffset (a scalar) Args : on set, new value (a scalar or undef, optional) yoffset Title : yoffset Usage : $obj->yoffset($newval) Function: Example : Returns : value of yoffset (a scalar) Args : on set, new value (a scalar or undef, optional) xmin Title : xmin Usage : $obj->xmin($newval) Function: Example : Returns : value of xmin (a scalar) Args : on set, new value (a scalar or undef, optional) xmax Title : xmax Usage : $obj->xmax($newval) Function: Example : Returns : value of xmax (a scalar) Args : on set, new value (a scalar or undef, optional) ymin Title : ymin Usage : $obj->ymin($newval) Function: Example : Returns : value of ymin (a scalar) Args : on set, new value (a scalar or undef, optional) ymax Title : ymax Usage : $obj->ymax($newval) Function: Example : Returns : value of ymax (a scalar) Args : on set, new value (a scalar or undef, optional) xrange Title : xrange Usage : $obj->xrange($newval) Function: Example : Returns : value of xrange (a scalar) yrange Title : yrange Usage : $obj->yrange($newval) Function: Example : Returns : value of yrange (a scalar) stack Title : stack Usage : $obj->stack($newval) Function: Example : Returns : value of stack (a scalar) Args : on set, new value (a scalar or undef, optional) perl v5.10.0 2009-01-07 Frame(3pm)
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