1 /* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <lowlevellock.h>
27 #include <shlib-compat.h>
28 #include <kernel-features.h>
32 __pthread_cond_broadcast (cond)
35 /* Make sure we are alone. */
36 lll_mutex_lock (cond->__data.__lock);
38 /* Are there any waiters to be woken? */
39 if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
41 /* Yes. Mark them all as woken. */
42 cond->__data.__wakeup_seq = cond->__data.__total_seq;
43 cond->__data.__woken_seq = cond->__data.__total_seq;
44 /* Signal that a broadcast happened. */
45 ++cond->__data.__broadcast_seq;
48 lll_mutex_unlock (cond->__data.__lock);
50 /* The futex syscall operates on a 32-bit word. That is fine,
51 we just use the low 32 bits of the sequence counter. */
52 #if BYTE_ORDER == LITTLE_ENDIAN
53 int *futex = ((int *) (&cond->__data.__wakeup_seq));
54 #elif BYTE_ORDER == BIG_ENDIAN
55 int *futex = ((int *) (&cond->__data.__wakeup_seq)) + 1;
57 # error "No valid byte order"
60 /* Do not use requeue for pshared condvars. */
61 if (cond->__data.__mutex == (void *) ~0l)
65 pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
66 if (__builtin_expect (lll_futex_requeue (futex, 1, INT_MAX,
67 &mut->__data.__lock) == -EINVAL,
70 /* The requeue functionality is not available. */
72 lll_futex_wake (futex, INT_MAX);
80 lll_mutex_unlock (cond->__data.__lock);
85 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,