b8b91e982e
The code in gdb.threads/staticthreads.exp about checking the value of tlsvar in main thread is racy, because when child thread hits breakpoint, the main thread may not go into pthread_join yet, and may not be unwind to main. This patch is to move the line setting breakpoint on after sem_wait, so that the child thread will hit breakpoint after main thread calls sem_post. IOW, when child thread hits breakpoint, the main thread is in either sem_post or pthread_join. "up 10" can unwind main thread to main. gdb/testsuite: 2014-06-06 Yao Qi <yao@codesourcery.com> * gdb.threads/staticthreads.c (thread_function): Move the line setting breakpoint on forward. * gdb.threads/staticthreads.exp: Update comments.
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/* This test program is part of GDB, The GNU debugger.
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Copyright 2004-2014 Free Software Foundation, Inc.
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Originally written by Jeff Johnston <jjohnstn@redhat.com>,
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contributed by Red Hat
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This file is part of GDB.
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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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#include <pthread.h>
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#include <semaphore.h>
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#include <stdio.h>
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#include <limits.h>
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#include <errno.h>
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sem_t semaphore;
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#ifdef HAVE_TLS
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__thread int tlsvar;
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#endif
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void *
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thread_function (void *arg)
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{
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#ifdef HAVE_TLS
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tlsvar = 2;
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#endif
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while (sem_wait (&semaphore) != 0)
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{
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if (errno != EINTR)
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{
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perror ("thread_function");
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return NULL;
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}
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}
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printf ("Thread executing\n"); /* tlsvar-is-set */
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return NULL;
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}
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int
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main (int argc, char **argv)
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{
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pthread_attr_t attr;
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pthread_attr_init (&attr);
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pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
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if (sem_init (&semaphore, 0, 0) == -1)
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{
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perror ("semaphore");
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return -1;
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}
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#ifdef HAVE_TLS
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tlsvar = 1;
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#endif
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/* Create a thread, wait for it to complete. */
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{
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pthread_t thread;
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pthread_create (&thread, &attr, thread_function, NULL);
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sem_post (&semaphore);
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pthread_join (thread, NULL);
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}
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pthread_attr_destroy (&attr);
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return 0;
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}
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