gdb/testsuite/gdb.threads/threadapply.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2002-2015 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
  31 int main() {
  32     int res;
  33     int all_started;
  34     pthread_t threads[NUM];
  35     void *thread_result;
  36     long i;
  37
  38     for (i = 0; i < NUM; i++)
  39       {
  40         args[i] = 1; /* Init value.  */
  41         res = pthread_create(&threads[i],
  42                              NULL,
  43                              thread_function,
  44                              (void *) i);
  45       }
  46
  47     all_started = 0;
  48     while (!all_started)
  49       {
  50         all_started = 1;
  51         for (i = 0; i < NUM; i++)
  52           {
  53             if (args[i] == 1)
  54               {
  55                 all_started = 0;
  56                 break;
  57               }
  58           }
  59       }
  60
  61     args[i] = 1;
  62     /* Break here */
  63     thread_function ((void *) i);
  64
  65     exit(EXIT_SUCCESS);
  66 }
  67
  68 void *thread_function(void *arg) {
  69     int my_number =  (long) arg;
  70     int *myp = (int *) &args[my_number];
  71
  72     /* Don't run forever.  Run just short of it :)  */
  73     while (*myp > 0)
  74       {
  75         (*myp) ++;  /* Loop increment.  */
  76       }
  77
  78     pthread_exit(NULL);
  79 }
  80