linux kernel - Why is clock_nanosleep sleeping for 20 ms when it is configured to sleep for 10 ms? -

-

i trying run task periodically every 10 ms. before executing task, want check consistency of clock_nanosleep. took 10 values check time clock_nanosleep sleeping, varying in between 19-22 ms, should 10 ms.

i running thread sched_fifo, pri-98, hrtimers enabled in linux. currently, using 3.14.29 linux kernel rt patch. clock_nanosleep require configuration in linux apart hrtimers?

below code snippet running:

struct timespec arr[20]; while(1) {     clock_gettime(clock_monotonic,&check1);     if(i<20) {         arr[i].tv_sec = check1.tv_sec;         arr[i].tv_nsec = check1.tv_nsec;         ++i;     }     check1.tv_nsec += p_ct->period;      clock_nanosleep(clock_monotonic, timer_abstime, &check1, null);      clock_gettime(clock_monotonic,&check);     if(i<20) {         arr[i].tv_sec = check.tv_sec;         arr[i].tv_nsec = check.tv_nsec;         ++i;     } }

  • check return values of clock_gettime , clock_nanosleep. maybe there interruption signal
  • run 2 sequenced clock_gettime , calculate average execution time of clock_gettime. don't think around 9-12ms, let's check

code:

int r1 = clock_gettime(clock_monotonic,&check1); int r2 = clock_gettime(clock_monotonic,&check);   if(i<20) {       arr[i].tv_sec = check1.tv_sec;       arr[i].tv_nsec = check1.tv_nsec;       ++i;   }   if(i<20) {       arr[i].tv_sec = check.tv_sec;       arr[i].tv_nsec = check.tv_nsec;       ++i;   }   printf("%d %d\n", r1, r2);

Comments

Post a Comment

Popular posts from this blog

Hatching array of circles in AutoCAD using c# -

-
i beginner in autocad plugins .i have created array of circle using following code. now, have hatch circles in array .how that??how hatch circles @ once? moreover, how can return hatch method , use hatch objects.sorry language.thanks in advance. [assembly: commandclass(typeof(beamsection.class1))] namespace beamsection { public class class1 { //class1 obj = new class1(); [commandmethod("beamatsupport")] public void addlightweightpolyline() { // current document , database document acdoc = application.documentmanager.mdiactivedocument; database accurdb = acdoc.database; promptpointresult ppr = acdoc.editor.getpoint("\nselect starting point "); var ucs = acdoc.editor.currentusercoordinatesystem; point3d startingpt = ppr.value.transformby(ucs); list<double> radius = new list<double>(); radius.add(0.5);
Read more

ios - UITEXTFIELD InputView Uipicker not working in swift -

-
hello trying pop uipickerview view programmatically when user clicks on textfield. have tried doesn't doing anything. isn't working. nothing happening when click textfield class userprofiletableviewcontroller: uitableviewcontroller,uitextfielddelegate,uipickerviewdelegate,uipickerviewdatasource { var itempicker: uipickerview! = uipickerview() @iboutlet weak var gendertxtfield: uitextfield! var gender = ["male","female"] override func viewdidload() { super.viewdidload() gendertxtfield.delegate = self itempicker!.delegate = self itempicker!.datasource = self itempicker!.backgroundcolor = uicolor.blackcolor() self.gendertxtfield.inputview = itempicker } func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{ return 1 } // returns # of rows in each component.. func pickerview(pickerview: uipickerview, numberofrowsincomponent component:
Read more

Python Pig Latin Translator -

-
so have been working on @ codecademy.com while trying learn python. don't know if blind , can't see why won't work or what. here's code won't let me use. function print variable if had typed in , print "empty" if didn't type anything. print "welcome english pig latin translator!" original = raw_input("what's name?") if len(original) > 0 print original else print "empty" if len(original) > 0 else the above lines contains syntax errors. try: if len(original) > 0: else: note added colons, ( : ).
Read more