tests/tcg/multiarch/threadcount.c

   1 /*
   2  * Thread Exerciser
   3  *
   4  * Unlike testthread which is mainly concerned about testing thread
   5  * semantics this test is used to exercise the thread creation and
   6  * accounting. A version of this test found a problem with clashing
   7  * cpu_indexes which caused a break in plugin handling.
   8  *
   9  * Based on the original test case by Nikolay Igotti.
  10  *
  11  * Copyright (c) 2020 Linaro Ltd
  12  *
  13  * SPDX-License-Identifier: GPL-2.0-or-later
  14  */
  15
  16 #include <stdint.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20 #include <pthread.h>
  21
  22 int max_threads = 10;
  23
  24 typedef struct {
  25     int delay;
  26 } ThreadArg;
  27
  28 static void *thread_fn(void* varg)
  29 {
  30     ThreadArg *arg = varg;
  31     usleep(arg->delay);
  32     free(arg);
  33     return NULL;
  34 }
  35
  36 int main(int argc, char **argv)
  37 {
  38     int i;
  39     pthread_t *threads;
  40
  41     if (argc > 1) {
  42         max_threads = atoi(argv[1]);
  43     }
  44     threads = calloc(sizeof(pthread_t), max_threads);
  45
  46     for (i = 0; i < max_threads; i++) {
  47         ThreadArg *arg = calloc(sizeof(ThreadArg), 1);
  48         arg->delay = i * 100;
  49         pthread_create(threads + i, NULL, thread_fn, arg);
  50     }
  51
  52     printf("Created %d threads\n", max_threads);
  53
  54     /* sleep until roughly half the threads have "finished" */
  55     usleep(max_threads * 50);
  56
  57     for (i = 0; i < max_threads; i++) {
  58         pthread_join(threads[i], NULL);
  59     }
  60
  61     printf("Done\n");
  62
  63     return 0;
  64 }