1 /* Create threads from multiple threads in parallel. 2 Copyright 2007-2023 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 #include <pthread.h> 20 #include <stdio.h> 21 #include <limits.h> 22 23 #define NUM_CREATE 1 24 #define NUM_THREAD 8 25 26 void * 27 thread_function (void *arg) 28 { 29 int x = * (int *) arg; 30 31 printf ("Thread <%d> executing\n", x); 32 33 return NULL; 34 } 35 36 void * 37 create_function (void *arg) 38 { 39 pthread_attr_t attr; 40 pthread_t threads[NUM_THREAD]; 41 int args[NUM_THREAD]; 42 int i = * (int *) arg; 43 int j; 44 45 pthread_attr_init (&attr); /* set breakpoint 1 here. */ 46 pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN); 47 48 /* Create a ton of quick-executing threads, then wait for them to 49 complete. */ 50 for (j = 0; j < NUM_THREAD; ++j) 51 { 52 args[j] = i * 1000 + j; 53 pthread_create (&threads[j], &attr, thread_function, &args[j]); 54 } 55 56 for (j = 0; j < NUM_THREAD; ++j) 57 pthread_join (threads[j], NULL); 58 59 pthread_attr_destroy (&attr); 60 61 return NULL; 62 } 63 64 int 65 main (int argc, char **argv) 66 { 67 pthread_attr_t attr; 68 pthread_t threads[NUM_CREATE]; 69 int args[NUM_CREATE]; 70 int n, i; 71 72 pthread_attr_init (&attr); 73 pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN); 74 75 for (n = 0; n < 100; ++n) 76 { 77 for (i = 0; i < NUM_CREATE; i++) 78 { 79 args[i] = i; 80 pthread_create (&threads[i], &attr, create_function, &args[i]); 81 } 82 83 create_function (&i); 84 for (i = 0; i < NUM_CREATE; i++) 85 pthread_join (threads[i], NULL); 86 } 87 88 pthread_attr_destroy (&attr); 89 90 return 0; 91 } 92