2007-05-17 Ulrich Drepper <drepper@redhat.com>
+ [BZ #4512]
+ * pthread_mutex_lock.c: Preserve FUTEX_WAITERS bit when dead owner
+ is detected.
+ * pthread_mutex_timedlock.c: Likewise.
+ * pthread_mutex_trylock.c: Likewise.
+ Patch in part by Atsushi Nemoto <anemo@mba.ocn.ne.jp>.
+
+ * Makefile (tests): Add tst-robust9 and tst-robustpi9.
+ * tst-robust9.c: New file.
+ * tst-robustpi9.c: New file.
+
* sysdeps/unix/sysv/linux/sem_wait.c (__new_sem_wait): Remove
unnecessary extra cancellation test.
-# Copyright (C) 2002,2003,2004,2005,2006 Free Software Foundation, Inc.
+# Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
tst-cond14 tst-cond15 tst-cond16 tst-cond17 tst-cond18 tst-cond19 \
tst-cond20 tst-cond21 tst-cond22 \
tst-robust1 tst-robust2 tst-robust3 tst-robust4 tst-robust5 \
- tst-robust6 tst-robust7 tst-robust8 \
- tst-robustpi1 tst-robustpi2 tst-robustpi3 tst-robustpi4 \
- tst-robustpi5 tst-robustpi6 tst-robustpi7 tst-robustpi8 \
+ tst-robust6 tst-robust7 tst-robust8 tst-robust9 \
+ tst-robustpi1 tst-robustpi2 tst-robustpi3 tst-robustpi4 tst-robustpi5 \
+ tst-robustpi6 tst-robustpi7 tst-robustpi8 tst-robustpi9 \
tst-rwlock1 tst-rwlock2 tst-rwlock3 tst-rwlock4 tst-rwlock5 \
tst-rwlock6 tst-rwlock7 tst-rwlock8 tst-rwlock9 tst-rwlock10 \
tst-rwlock11 tst-rwlock12 tst-rwlock13 tst-rwlock14 \
-/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
int newval = id;
#ifdef NO_INCR
newval |= FUTEX_WAITERS;
+#else
+ newval |= (oldval & FUTEX_WAITERS);
#endif
newval
-/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
if ((oldval & FUTEX_OWNER_DIED) != 0)
{
/* The previous owner died. Try locking the mutex. */
- int newval
+ int newval = id | (oldval & FUTEX_WAITERS);
+
+ newval
= atomic_compare_and_exchange_val_acq (&mutex->__data.__lock,
- id, oldval);
+ newval, oldval);
if (newval != oldval)
{
oldval = newval;
if ((oldval & FUTEX_OWNER_DIED) != 0)
{
/* The previous owner died. Try locking the mutex. */
- int newval
+ int newval = id | (oldval & FUTEX_WAITERS);
+
+ newval
= atomic_compare_and_exchange_val_acq (&mutex->__data.__lock,
- id, oldval);
+ newval, oldval);
if (newval != oldval)
{
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+
+static pthread_mutex_t m;
+
+static void *
+tf (void *data)
+{
+ int err = pthread_mutex_lock (&m);
+ if (err == EOWNERDEAD)
+ {
+ err = pthread_mutex_consistent_np (&m);
+ if (err)
+ {
+ puts ("pthread_mutex_consistent_np");
+ exit (1);
+ }
+ }
+ else if (err)
+ {
+ puts ("pthread_mutex_lock");
+ exit (1);
+ }
+ printf ("thread%ld got the lock.\n", (long int) data);
+ sleep (1);
+ /* exit without unlock */
+ return NULL;
+}
+
+static int
+do_test (void)
+{
+ int err, i;
+ pthread_t t[3];
+ pthread_mutexattr_t ma;
+
+ pthread_mutexattr_init (&ma);
+ err = pthread_mutexattr_setrobust_np (&ma, PTHREAD_MUTEX_ROBUST_NP);
+ if (err)
+ {
+ puts ("pthread_mutexattr_setrobust_np");
+ return 1;
+ }
+#ifdef ENABLE_PI
+ if (pthread_mutexattr_setprotocol (&ma, PTHREAD_PRIO_INHERIT) != 0)
+ {
+ puts ("pthread_mutexattr_setprotocol failed");
+ return 1;
+ }
+#endif
+ err = pthread_mutex_init (&m, &ma);
+ if (err)
+ {
+ puts ("pthread_mutex_init");
+ return 1;
+ }
+
+ for (i = 0; i < sizeof (t) / sizeof (t[0]); i++)
+ {
+ err = pthread_create (&t[i], NULL, tf, (void *) (long int) i);
+ if (err)
+ {
+ puts ("pthread_create");
+ return 1;
+ }
+ }
+
+ for (i = 0; i < sizeof (t) / sizeof (t[0]); i++)
+ {
+ err = pthread_join (t[i], NULL);
+ if (err)
+ {
+ puts ("pthread_join");
+ return 1;
+ }
+ }
+ return 0;
+}
+
+#define TIMEOUT 5
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"