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124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/* Verify that pthread_create does not deadlock when ctors take locks.
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Copyright (C) 2021-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <support/xdlfcn.h>
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#include <support/xthread.h>
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/*
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Check if ctor and pthread_create deadlocks in
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thread 1: dlopen -> ctor -> lock(user_lock)
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thread 2: lock(user_lock) -> pthread_create
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or in
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thread 1: dlclose -> dtor -> lock(user_lock)
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thread 2: lock(user_lock) -> pthread_create
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*/
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static pthread_barrier_t bar_ctor;
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static pthread_barrier_t bar_ctor_finish;
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static pthread_barrier_t bar_dtor;
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static pthread_mutex_t user_lock = PTHREAD_MUTEX_INITIALIZER;
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void
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ctor (void)
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{
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xpthread_barrier_wait (&bar_ctor);
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dprintf (1, "thread 1: in ctor: started.\n");
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xpthread_mutex_lock (&user_lock);
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dprintf (1, "thread 1: in ctor: locked user_lock.\n");
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xpthread_mutex_unlock (&user_lock);
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dprintf (1, "thread 1: in ctor: unlocked user_lock.\n");
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dprintf (1, "thread 1: in ctor: done.\n");
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xpthread_barrier_wait (&bar_ctor_finish);
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}
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void
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dtor (void)
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{
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xpthread_barrier_wait (&bar_dtor);
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dprintf (1, "thread 1: in dtor: started.\n");
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xpthread_mutex_lock (&user_lock);
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dprintf (1, "thread 1: in dtor: locked user_lock.\n");
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xpthread_mutex_unlock (&user_lock);
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dprintf (1, "thread 1: in dtor: unlocked user_lock.\n");
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dprintf (1, "thread 1: in dtor: done.\n");
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}
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static void *
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thread3 (void *a)
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{
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dprintf (1, "thread 3: started.\n");
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dprintf (1, "thread 3: done.\n");
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return 0;
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}
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static void *
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thread2 (void *a)
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{
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pthread_t t3;
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dprintf (1, "thread 2: started.\n");
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xpthread_mutex_lock (&user_lock);
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dprintf (1, "thread 2: locked user_lock.\n");
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xpthread_barrier_wait (&bar_ctor);
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t3 = xpthread_create (0, thread3, 0);
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xpthread_mutex_unlock (&user_lock);
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dprintf (1, "thread 2: unlocked user_lock.\n");
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xpthread_join (t3);
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xpthread_barrier_wait (&bar_ctor_finish);
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xpthread_mutex_lock (&user_lock);
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dprintf (1, "thread 2: locked user_lock.\n");
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xpthread_barrier_wait (&bar_dtor);
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t3 = xpthread_create (0, thread3, 0);
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xpthread_mutex_unlock (&user_lock);
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dprintf (1, "thread 2: unlocked user_lock.\n");
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xpthread_join (t3);
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dprintf (1, "thread 2: done.\n");
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return 0;
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}
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static void
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thread1 (void)
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{
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dprintf (1, "thread 1: started.\n");
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xpthread_barrier_init (&bar_ctor, NULL, 2);
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xpthread_barrier_init (&bar_ctor_finish, NULL, 2);
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xpthread_barrier_init (&bar_dtor, NULL, 2);
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pthread_t t2 = xpthread_create (0, thread2, 0);
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void *p = xdlopen ("tst-create1mod.so", RTLD_NOW | RTLD_GLOBAL);
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dprintf (1, "thread 1: dlopen done.\n");
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xdlclose (p);
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dprintf (1, "thread 1: dlclose done.\n");
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xpthread_join (t2);
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dprintf (1, "thread 1: done.\n");
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}
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static int
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do_test (void)
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{
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thread1 ();
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return 0;
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}
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#include <support/test-driver.c>
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