static char help[] = "Tests nested events.\n\n";

#include <petscsys.h>

int main(int argc, char **argv) {
  int event1, event2, event3;

  PetscFunctionBeginUser;
  PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
  PetscCall(PetscLogEventRegister("Event2", 0, &event2));
  PetscCall(PetscLogEventRegister("Event1", 0, &event1));
  PetscCall(PetscLogEventRegister("Event3", 0, &event3));

  PetscCall(PetscLogEventBegin(event1, 0, 0, 0, 0));
  PetscCall(PetscSleep(1.0));
  PetscCall(PetscLogEventBegin(event2, 0, 0, 0, 0));
  PetscCall(PetscSleep(1.0));
  PetscCall(PetscLogEventBegin(event3, 0, 0, 0, 0));
  PetscCall(PetscSleep(1.0));
  PetscCall(PetscLogEventEnd(event3, 0, 0, 0, 0));
  PetscCall(PetscLogEventEnd(event2, 0, 0, 0, 0));
  PetscCall(PetscLogEventEnd(event1, 0, 0, 0, 0));
  PetscCall(PetscFinalize());
  return 0;
}