gdb/testsuite/gdb.threads/threadapply.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002-2021 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18    This file is copied from schedlock.c.  */
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include <pthread.h>
  24
  25 void *thread_function(void *arg); /* Pointer to function executed by each thread */
  26
  27 #define NUM 5
  28
  29 unsigned int args[NUM+1];
  30 pthread_barrier_t mybarrier;
  31
  32 int main() {
  33     int res;
  34     int all_started;
  35     pthread_t threads[NUM];
  36     void *thread_result;
  37     long i;
  38
  39     pthread_barrier_init(&mybarrier, NULL, NUM + 1);
  40
  41     for (i = 0; i < NUM; i++)
  42       {
  43         args[i] = 1; /* Init value.  */
  44         res = pthread_create(&threads[i],
  45                              NULL,
  46                              thread_function,
  47                              (void *) i);
  48       }
  49
  50     all_started = 0;
  51     while (!all_started)
  52       {
  53         all_started = 1;
  54         for (i = 0; i < NUM; i++)
  55           {
  56             if (args[i] == 1)
  57               {
  58                 all_started = 0;
  59                 break;
  60               }
  61           }
  62       }
  63
  64     args[i] = 1;
  65     /* Break here */
  66     thread_function ((void *) i);
  67
  68     exit(EXIT_SUCCESS);
  69 }
  70
  71 void *thread_function(void *arg) {
  72     int my_number =  (long) arg;
  73     int *myp = (int *) &args[my_number];
  74
  75     (*myp) ++;  /* Increment so parent knows child started.  */
  76     pthread_barrier_wait(&mybarrier);
  77 }
  78