machinekit-hal
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machinekit
Cannot delete a ring with halcmd
I'm not sure I completely understand the syntax, but if I'm not confused it doesn't look like you can delete a ring with halcmd once it's created:
machinekit@beaglebone:~$ halcmd newring test 1024
machinekit@beaglebone:~$ halcmd show ring
Rings:
Name Size Type Rdr Wrt Ref Flags
test 1024 record 0/0 0/0 0 recmax:1008
machinekit@beaglebone:~$ halcmd delring test
delring NIY: ring='test'
machinekit@beaglebone:~$ halcmd show ring
Rings:
Name Size Type Rdr Wrt Ref Flags
test 1024 record 0/0 0/0 0 recmax:1008
machinekit@beaglebone:~$ halcmd newring test 1024
<commandline>:0: newring: failed to create new ring test: File exists
machinekit@beaglebone:~$
It looks like "NIY" means Not Implemented Yet. I guess this is a feature request and not a bug...here's the code:
int do_delring_cmd(char *ring)
{
halcmd_output("delring NIY: ring='%s'\n", ring);
// return halpr_group_delete(group);
return 0;
}
A ringbuffer is a toplevel HAL object (=independent of any other) and there is no dependency tracking of which comps reference a ringbuffer - deleting a ringbuffer which happens to be referenced by a comp will likely lead to a crash
so it is best to consider a ringbuffer "eternal" (for HAL session lifetime)
the delring command is implemented in the last version I worked on 13 months ago but I do not recommend it except after all comps are unloaded
