simpleperf/runtest/function_fork.cpp

#include <stdlib.h>
#include <unistd.h>

constexpr int LOOP_COUNT = 100000000;

volatile int a[2];
void ParentFunction() {
  volatile int* p = a + atoi("0");
  for (int i = 0; i < LOOP_COUNT; ++i) {
    *p = i;
  }
}

void ChildFunction() {
  volatile int* p = a + atoi("1");
  for (int i = 0; i < LOOP_COUNT; ++i) {
    *p = i;
  }
}

int main() {
  pid_t pid = fork();
  if (pid == 0) {
    ChildFunction();
    return 0;
  } else {
    ParentFunction();
  }
  return 0;
}