gdb/testsuite/gdb.threads/threadapply.c

/* This testcase is part of GDB, the GNU debugger.

   Copyright 2002-2021 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
   This file is copied from schedlock.c.  */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>

void *thread_function(void *arg); /* Pointer to function executed by each thread */

#define NUM 5

unsigned int args[NUM+1];
pthread_barrier_t mybarrier;

int main() {
    int res;
    int all_started;
    pthread_t threads[NUM];
    void *thread_result;
    long i;

    pthread_barrier_init(&mybarrier, NULL, NUM + 1);

    for (i = 0; i < NUM; i++)
      {
	args[i] = 1; /* Init value.  */
	res = pthread_create(&threads[i],
		             NULL,
			     thread_function,
			     (void *) i);
      }

    all_started = 0;
    while (!all_started)
      {
	all_started = 1;
        for (i = 0; i < NUM; i++)
          {
            if (args[i] == 1)
	      {
	        all_started = 0;
	        break;
	      }
          }  
      }
	
    args[i] = 1;
    /* Break here */
    thread_function ((void *) i);

    exit(EXIT_SUCCESS);
}

void *thread_function(void *arg) {
    int my_number =  (long) arg;
    int *myp = (int *) &args[my_number];

    (*myp) ++;  /* Increment so parent knows child started.  */
    pthread_barrier_wait(&mybarrier);
}