powerpc: Add a POWER8-optimized version of sinf()
[glibc.git] / nptl / pthread_cond_broadcast.c
blob552fd42f60148e1af54ae2a4feff74dae7003228
1 /* Copyright (C) 2003-2016 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/>. */
19 #include <endian.h>
20 #include <errno.h>
21 #include <sysdep.h>
22 #include <lowlevellock.h>
23 #include <pthread.h>
24 #include <pthreadP.h>
25 #include <stap-probe.h>
27 #include <shlib-compat.h>
28 #include <kernel-features.h>
31 int
32 __pthread_cond_broadcast (pthread_cond_t *cond)
34 LIBC_PROBE (cond_broadcast, 1, cond);
36 int pshared = (cond->__data.__mutex == (void *) ~0l)
37 ? LLL_SHARED : LLL_PRIVATE;
38 /* Make sure we are alone. */
39 lll_lock (cond->__data.__lock, pshared);
41 /* Are there any waiters to be woken? */
42 if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
44 /* Yes. Mark them all as woken. */
45 cond->__data.__wakeup_seq = cond->__data.__total_seq;
46 cond->__data.__woken_seq = cond->__data.__total_seq;
47 cond->__data.__futex = (unsigned int) cond->__data.__total_seq * 2;
48 int futex_val = cond->__data.__futex;
49 /* Signal that a broadcast happened. */
50 ++cond->__data.__broadcast_seq;
52 /* We are done. */
53 lll_unlock (cond->__data.__lock, pshared);
55 /* Wake everybody. */
56 pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
58 /* Do not use requeue for pshared condvars. */
59 if (mut == (void *) ~0l
60 || PTHREAD_MUTEX_PSHARED (mut) & PTHREAD_MUTEX_PSHARED_BIT)
61 goto wake_all;
63 #if (defined lll_futex_cmp_requeue_pi \
64 && defined __ASSUME_REQUEUE_PI)
65 if (USE_REQUEUE_PI (mut))
67 if (lll_futex_cmp_requeue_pi (&cond->__data.__futex, 1, INT_MAX,
68 &mut->__data.__lock, futex_val,
69 LLL_PRIVATE) == 0)
70 return 0;
72 else
73 #endif
74 /* lll_futex_requeue returns 0 for success and non-zero
75 for errors. */
76 if (!__builtin_expect (lll_futex_requeue (&cond->__data.__futex, 1,
77 INT_MAX, &mut->__data.__lock,
78 futex_val, LLL_PRIVATE), 0))
79 return 0;
81 wake_all:
82 lll_futex_wake (&cond->__data.__futex, INT_MAX, pshared);
83 return 0;
86 /* We are done. */
87 lll_unlock (cond->__data.__lock, pshared);
89 return 0;
92 versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
93 GLIBC_2_3_2);