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[BZ #2843]
2006-08-12 Ulrich Drepper <drepper@redhat.com> [BZ #2843] * pthread_join.c (pthread_join): Account for self being canceled when checking for deadlocks. * tst-join5.c: Cleanups. Allow to be used in tst-join6. (tf1): Don't print anything after pthread_join returns, this would be another cancellation point. (tf2): Likewise. * tst-join6.c: New file. * Makefile (tests): Add tst-join6.
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Ulrich Drepper
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@ -1,3 +1,15 @@
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2006-08-12 Ulrich Drepper <drepper@redhat.com>
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[BZ #2843]
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* pthread_join.c (pthread_join): Account for self being canceled
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when checking for deadlocks.
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* tst-join5.c: Cleanups. Allow to be used in tst-join6.
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(tf1): Don't print anything after pthread_join returns, this would be
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another cancellation point.
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(tf2): Likewise.
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* tst-join6.c: New file.
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* Makefile (tests): Add tst-join6.
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2006-08-03 Ulrich Drepper <drepper@redhat.com>
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[BZ #2892]
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@ -224,7 +224,7 @@ tests = tst-typesizes \
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tst-basic1 tst-basic2 tst-basic3 tst-basic4 tst-basic5 tst-basic6 \
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tst-kill1 tst-kill2 tst-kill3 tst-kill4 tst-kill5 tst-kill6 \
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tst-raise1 \
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tst-join1 tst-join2 tst-join3 tst-join4 tst-join5 \
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tst-join1 tst-join2 tst-join3 tst-join4 tst-join5 tst-join6 \
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tst-detach1 \
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tst-eintr1 tst-eintr2 tst-eintr3 tst-eintr4 tst-eintr5 \
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tst-tsd1 tst-tsd2 tst-tsd3 tst-tsd4 tst-tsd5 \
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@ -1,4 +1,4 @@
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/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
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/* Copyright (C) 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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@ -27,7 +27,11 @@
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static void
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cleanup (void *arg)
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{
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*(void **) arg = NULL;
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/* If we already changed the waiter ID, reset it. The call cannot
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fail for any reason but the thread not having done that yet so
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there is no reason for a loop. */
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atomic_compare_and_exchange_bool_acq ((struct pthread **) arg, NULL,
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THREAD_SELF);
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}
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@ -36,7 +40,6 @@ pthread_join (threadid, thread_return)
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pthread_t threadid;
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void **thread_return;
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{
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struct pthread *self;
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struct pthread *pd = (struct pthread *) threadid;
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/* Make sure the descriptor is valid. */
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@ -49,12 +52,23 @@ pthread_join (threadid, thread_return)
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/* We cannot wait for the thread. */
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return EINVAL;
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self = THREAD_SELF;
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if (pd == self
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|| (self->joinid == pd
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&& (pd->cancelhandling
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& (CANCELING_BITMASK | CANCELED_BITMASK | EXITING_BITMASK
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| TERMINATED_BITMASK)) == 0))
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struct pthread *self = THREAD_SELF;
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int result = 0;
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/* During the wait we change to asynchronous cancellation. If we
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are canceled the thread we are waiting for must be marked as
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un-wait-ed for again. */
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pthread_cleanup_push (cleanup, &pd->joinid);
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/* Switch to asynchronous cancellation. */
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int oldtype = CANCEL_ASYNC ();
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if ((pd == self
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|| (self->joinid == pd
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&& (pd->cancelhandling
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& (CANCELING_BITMASK | CANCELED_BITMASK | EXITING_BITMASK
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| TERMINATED_BITMASK)) == 0))
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&& !CANCEL_ENABLED_AND_CANCELED (self->cancelhandling))
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/* This is a deadlock situation. The threads are waiting for each
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other to finish. Note that this is a "may" error. To be 100%
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sure we catch this error we would have to lock the data
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@ -62,28 +76,17 @@ pthread_join (threadid, thread_return)
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two threads are really caught in this situation they will
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deadlock. It is the programmer's problem to figure this
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out. */
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return EDEADLK;
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result = EDEADLK;
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/* Wait for the thread to finish. If it is already locked something
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is wrong. There can only be one waiter. */
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if (__builtin_expect (atomic_compare_and_exchange_bool_acq (&pd->joinid,
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self,
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NULL), 0))
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else if (__builtin_expect (atomic_compare_and_exchange_bool_acq (&pd->joinid,
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self,
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NULL), 0))
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/* There is already somebody waiting for the thread. */
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return EINVAL;
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/* During the wait we change to asynchronous cancellation. If we
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are cancelled the thread we are waiting for must be marked as
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un-wait-ed for again. */
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pthread_cleanup_push (cleanup, &pd->joinid);
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/* Switch to asynchronous cancellation. */
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int oldtype = CANCEL_ASYNC ();
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/* Wait for the child. */
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lll_wait_tid (pd->tid);
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result = EINVAL;
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else
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/* Wait for the child. */
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lll_wait_tid (pd->tid);
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/* Restore cancellation mode. */
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@ -93,16 +96,19 @@ pthread_join (threadid, thread_return)
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pthread_cleanup_pop (0);
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/* We mark the thread as terminated and as joined. */
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pd->tid = -1;
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if (__builtin_expect (result == 0, 1))
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{
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/* We mark the thread as terminated and as joined. */
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pd->tid = -1;
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/* Store the return value if the caller is interested. */
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if (thread_return != NULL)
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*thread_return = pd->result;
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/* Store the return value if the caller is interested. */
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if (thread_return != NULL)
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*thread_return = pd->result;
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/* Free the TCB. */
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__free_tcb (pd);
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/* Free the TCB. */
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__free_tcb (pd);
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}
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return 0;
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return result;
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}
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115
nptl/tst-join5.c
115
nptl/tst-join5.c
@ -1,4 +1,4 @@
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/* Copyright (C) 2003 Free Software Foundation, Inc.
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/* Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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@ -21,120 +21,187 @@
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#define wait_code() \
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do { \
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struct timespec ts = { .tv_sec = 0, .tv_nsec = 200000000 }; \
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while (syscall (__NR_nanosleep, &ts, &ts) < 0) \
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/* nothing */; \
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} while (0)
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#ifdef WAIT_IN_CHILD
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static pthread_barrier_t b;
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#endif
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static void *
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tf1 (void *arg)
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{
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#ifdef WAIT_IN_CHILD
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int e = pthread_barrier_wait (&b);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("%s: barrier_wait failed\n", __func__);
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exit (1);
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}
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wait_code ();
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#endif
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pthread_join ((pthread_t) arg, NULL);
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puts ("1st join returned");
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return (void *) 1l;
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exit (42);
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}
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static void *
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tf2 (void *arg)
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{
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#ifdef WAIT_IN_CHILD
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int e = pthread_barrier_wait (&b);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("%s: barrier_wait failed\n", __func__);
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exit (1);
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}
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wait_code ();
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#endif
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pthread_join ((pthread_t) arg, NULL);
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puts ("2nd join returned");
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return (void *) 1l;
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exit (43);
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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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#ifdef WAIT_IN_CHILD
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if (pthread_barrier_init (&b, NULL, 2) != 0)
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{
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puts ("barrier_init failed");
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return 1;
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}
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#endif
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pthread_t th;
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int err = pthread_join (pthread_self (), NULL);
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if (err == 0)
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{
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puts ("1st circular join succeeded");
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exit (1);
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return 1;
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}
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if (err != EDEADLK)
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{
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printf ("1st circular join %d, not EDEADLK\n", err);
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exit (1);
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return 1;
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}
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if (pthread_create (&th, NULL, tf1, (void *) pthread_self ()) != 0)
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{
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puts ("1st create failed");
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exit (1);
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return 1;
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}
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#ifndef WAIT_IN_CHILD
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wait_code ();
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#endif
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if (pthread_cancel (th) != 0)
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{
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puts ("cannot cancel 1st thread");
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exit (1);
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return 1;
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}
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#ifdef WAIT_IN_CHILD
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int e = pthread_barrier_wait (&b);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("%s: barrier_wait failed\n", __func__);
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return 1;
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}
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#endif
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void *r;
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err = pthread_join (th, &r);
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if (err != 0)
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{
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printf ("cannot join 1st thread: %d\n", err);
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exit (1);
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return 1;
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}
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if (r != PTHREAD_CANCELED)
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{
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puts ("1st thread not canceled");
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exit (1);
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return 1;
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}
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err = pthread_join (pthread_self (), NULL);
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if (err == 0)
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{
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puts ("2nd circular join succeeded");
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exit (1);
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return 1;
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}
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if (err != EDEADLK)
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{
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printf ("2nd circular join %d, not EDEADLK\n", err);
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exit (1);
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return 1;
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}
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if (pthread_create (&th, NULL, tf2, (void *) pthread_self ()) != 0)
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{
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puts ("2nd create failed");
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exit (1);
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return 1;
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}
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#ifndef WAIT_IN_CHILD
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wait_code ();
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#endif
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if (pthread_cancel (th) != 0)
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{
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puts ("cannot cancel 2nd thread");
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exit (1);
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return 1;
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}
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#ifdef WAIT_IN_CHILD
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e = pthread_barrier_wait (&b);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("%s: barrier_wait failed\n", __func__);
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return 1;
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}
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#endif
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if (pthread_join (th, &r) != 0)
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{
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puts ("cannot join 2nd thread");
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exit (1);
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return 1;
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}
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if (r != PTHREAD_CANCELED)
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{
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puts ("2nd thread not canceled");
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exit (1);
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return 1;
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}
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err = pthread_join (pthread_self (), NULL);
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if (err == 0)
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{
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puts ("2nd circular join succeeded");
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exit (1);
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puts ("3rd circular join succeeded");
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return 1;
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}
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if (err != EDEADLK)
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{
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printf ("2nd circular join %d, not EDEADLK\n", err);
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exit (1);
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printf ("3rd circular join %d, not EDEADLK\n", err);
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return 1;
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}
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exit (0);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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2
nptl/tst-join6.c
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2
nptl/tst-join6.c
Normal file
@ -0,0 +1,2 @@
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#define WAIT_IN_CHILD 1
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#include "tst-join5.c"
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