tools/perf/tests/workloads/sqrtloop.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <math.h>
   3 #include <signal.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <linux/compiler.h>
   7 #include <sys/wait.h>
   8 #include "../tests.h"
   9
  10 static volatile sig_atomic_t done;
  11
  12 static void sighandler(int sig __maybe_unused)
  13 {
  14         done = 1;
  15 }
  16
  17 static int __sqrtloop(int sec)
  18 {
  19         signal(SIGALRM, sighandler);
  20         alarm(sec);
  21
  22         while (!done)
  23                 (void)sqrt(rand());
  24         return 0;
  25 }
  26
  27 static int sqrtloop(int argc, const char **argv)
  28 {
  29         int sec = 1;
  30
  31         if (argc > 0)
  32                 sec = atoi(argv[0]);
  33
  34         switch (fork()) {
  35         case 0:
  36                 return __sqrtloop(sec);
  37         case -1:
  38                 return -1;
  39         default:
  40                 wait(NULL);
  41         }
  42         return 0;
  43 }
  44
  45 DEFINE_WORKLOAD(sqrtloop);