1 /* Copyright (C) 2003, 2004, 2006, 2007 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, see
17 <http://www.gnu.org/licenses/>. */
22 #include <lowlevellock.h>
26 #include <shlib-compat.h>
27 #include <kernel-features.h>
31 __pthread_cond_broadcast (cond
)
34 int pshared
= (cond
->__data
.__mutex
== (void *) ~0l)
35 ? LLL_SHARED
: LLL_PRIVATE
;
36 /* Make sure we are alone. */
37 lll_lock (cond
->__data
.__lock
, pshared
);
39 /* Are there any waiters to be woken? */
40 if (cond
->__data
.__total_seq
> cond
->__data
.__wakeup_seq
)
42 /* Yes. Mark them all as woken. */
43 cond
->__data
.__wakeup_seq
= cond
->__data
.__total_seq
;
44 cond
->__data
.__woken_seq
= cond
->__data
.__total_seq
;
45 cond
->__data
.__futex
= (unsigned int) cond
->__data
.__total_seq
* 2;
46 int futex_val
= cond
->__data
.__futex
;
47 /* Signal that a broadcast happened. */
48 ++cond
->__data
.__broadcast_seq
;
51 lll_unlock (cond
->__data
.__lock
, pshared
);
53 /* Do not use requeue for pshared condvars. */
54 if (cond
->__data
.__mutex
== (void *) ~0l)
58 pthread_mutex_t
*mut
= (pthread_mutex_t
*) cond
->__data
.__mutex
;
60 /* XXX: Kernel so far doesn't support requeue to PI futex. */
61 /* XXX: Kernel so far can only requeue to the same type of futex,
62 in this case private (we don't requeue for pshared condvars). */
63 if (__builtin_expect (mut
->__data
.__kind
64 & (PTHREAD_MUTEX_PRIO_INHERIT_NP
65 | PTHREAD_MUTEX_PSHARED_BIT
), 0))
68 /* lll_futex_requeue returns 0 for success and non-zero
70 if (__builtin_expect (lll_futex_requeue (&cond
->__data
.__futex
, 1,
71 INT_MAX
, &mut
->__data
.__lock
,
72 futex_val
, LLL_PRIVATE
), 0))
74 /* The requeue functionality is not available. */
76 lll_futex_wake (&cond
->__data
.__futex
, INT_MAX
, pshared
);
84 lll_unlock (cond
->__data
.__lock
, pshared
);
89 versioned_symbol (libpthread
, __pthread_cond_broadcast
, pthread_cond_broadcast
,