[Emc-developers] userspace comp frequency

[Thomas J Powderly]

hello
(sorry if double posted, i thinik orig dud not go thru)
I wrote a userspace .comp file to drive a pyvcp bar widget
I expected it to update every 1mS ( usleep(1000) )

But what I see is close to 1 hz 🙁

I use a rip of linuxcmc 2.9.1  on debian 12

It compiles ok with the followiung cmd...

tomp@D12emc291:~/linuxcnc-barwidgets/configs/tomp$ halcompile --install 
--userspace rand9.comp
gcc -I/home/tomp/linuxcnc-barwidgets/configs/tomp 
-I/home/tomp/linuxcnc-barwidgets/include -I/usr/include/linuxcnc -URTAPI 
-U__MODULE__ -DULAPI -Os  -o rand9 /tmp/tmp49hdcnk5/rand9.c 
-Wl,-rpath,/home/tomp/linuxcnc-barwidgets/lib 
-L/home/tomp/linuxcnc-barwidgets/lib -llinuxcnchal

halrun

loadusr rand9

loadusr halmeter

   choose   rand9.0.out

note the near 1hz change rate

any idea why its so slow?

thx

TomP
component rand9;
// hd lost all superblocks, no parftial filles recovered for this comp
// had to rebuilt
// works but but updates at 1hz   why??
//
// to build in rip
// halcompile --install --userspace rand9.comp
//  will create file  rand9  in ~/yourRipDir/bin
//
// to test after aboive
// cd; cd ripdir; . scripts/rip-environment
// halrun
// loadusr rand9
// loadusr halmeter
//    select ranf9.0.out
// note the changes are ~ 1hz   NOT the 1000uS of uSleep() call
//

option userspace;

// default min max , user can setp later as wanted
pin in  float   min=0;
pin in  float   max=100;

pin out float out;

license "GPL";
;;
#include <unistd.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>

// from 
https://stackoverflow.com/questions/5289613/generate-random-float-between-two-floats
float RandomFloat(float a, float b) {
  float random = ((float) rand()) / (float) RAND_MAX;
  float diff = b - a;
  float r = random * diff;
  return a + r;
}

void user_mainloop(void) {
    while(1) {
        usleep(1000);// thats 1000uSecs = 1mS but i see chgs every 1.0 secs ( 
1000000uSecs) why?
        srand(time(NULL));
        FOR_ALL_INSTS() out = RandomFloat(min,max);
    }
}
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