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4a94e36819
This commit brings all the changes made by running gdb/copyright.py as per GDB's Start of New Year Procedure. For the avoidance of doubt, all changes in this commits were performed by the script.
124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2021-2022 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#define _GNU_SOURCE
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#include <assert.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#define THREADS 20
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static volatile unsigned int global_var = 123;
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/* Wrapper around pthread_create. */
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static void
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create_thread (pthread_t *child,
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void *(*start_routine) (void *), void *arg)
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{
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int rc;
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while ((rc = pthread_create (child, NULL, start_routine, arg)) != 0)
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{
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fprintf (stderr, "unexpected error from pthread_create: %s (%d)\n",
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strerror (rc), rc);
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sleep (1);
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}
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}
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/* Data passed to threads on creation. This is allocated on the heap
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and ownership transferred from parent to child. */
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struct thread_arg
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{
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/* The thread's parent. */
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pthread_t parent;
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/* Whether to call pthread_join on the parent. */
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int join_parent;
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};
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/* Entry point for threads. */
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static void *
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thread_fn (void *arg)
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{
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struct thread_arg *p = arg;
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/* Passing no argument makes the thread exit immediately. */
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if (p == NULL)
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return NULL;
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if (p->join_parent)
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assert (pthread_join (p->parent, NULL) == 0);
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/* Spawn a number of threads that exit immediately, and then join
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them. The idea is to maximize the time window when we mostly
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have threads exiting. */
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{
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pthread_t child[THREADS];
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int i;
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/* Passing no argument makes the thread exit immediately. */
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for (i = 0; i < THREADS; i++)
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create_thread (&child[i], thread_fn, NULL);
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for (i = 0; i < THREADS; i++)
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pthread_join (child[i], NULL);
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}
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/* Spawn a new thread that joins us, and exit. The idea here is to
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not have any thread that stays around forever. */
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{
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pthread_t child;
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p->parent = pthread_self ();
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p->join_parent = 1;
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create_thread (&child, thread_fn, p);
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}
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return NULL;
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}
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int
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main (void)
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{
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int i;
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for (i = 0; i < 4; i++)
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{
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struct thread_arg *p;
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pthread_t child;
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p = malloc (sizeof *p);
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p->parent = pthread_self ();
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/* Only join the parent once. */
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if (i == 0)
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p->join_parent = 1;
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else
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p->join_parent = 0;
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create_thread (&child, thread_fn, p);
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}
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/* Exit the leader to make sure that we can access memory with the
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leader gone. */
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pthread_exit (NULL);
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}
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