so far I thought HAL pins and params belong to components and go away when the component exits whereas signals are first class objects which exist independently of any component. (NB: hal_sig_t in src/hal/hal_priv.c has NO owner_ptr member but params and pins DO have them.).
If this is so, then the behaviour exhibited below is an error - signals created by halcmd are deleted before a user component is loaded (internally hal_exit() is called which deletes the signals which have erroneously been 'associated' with the temporary component created by halcmd). I would think deleting signals by a hal_exit() is an error; however, this is potentially a far-reaching change so I thought I better hear opinions before fixing thos. - Michael ---- test.hal: newsig mysig s32 # note type show sig mysig # this creates the passthrough.out *float* pin loadusr -Wn passthrough python passthrough.py net mysig passthrough.out #---^^^^^^^^^^^^^^^^^^^^^ so this should fail with a type error # # mysig magically mutated to a float: show sig mysig -------- passthrough.py is the example from here: http://www.linuxcnc.org/docs/devel/html/hal/halmodule.html $ halrun -v -V -f test.hal HAL: initializing hal_lib HAL: initializing component 'halcmd15311' HAL: component 'halcmd15311' initialized, ID = 02 HAL: creating signal 'mysig' Signals: Type Value Name (linked to) s32 0 mysig HAL: removing component 02 <---------------- this deletes the signals defined so far!! HAL: component 02 removed, name = 'halcmd15311' HAL: initializing hal_lib HAL: initializing component 'halcmd15311' HAL: component 'halcmd15311' initialized, ID = 04 python passthrough.py test.hal:6: Component 'passthrough' ready test.hal:6: Program 'python' started HAL: creating signal 'mysig' <---------------- signal mysig implicitly created by net command HAL: linking pin 'passthrough.out' to 'mysig' test.hal:8: Pin 'passthrough.out' linked to signal 'mysig' Signals: Type Value Name (linked to) float 0 mysig <== passthrough.out HAL: removing component 04 HAL: component 04 removed, name = 'halcmd15311' ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
