1 /* Copyright (C) 2003-2014 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/>. */
21 #include <lowlevellock.h>
24 /* Wait on barrier. */
26 pthread_barrier_wait (barrier
)
27 pthread_barrier_t
*barrier
;
29 union sparc_pthread_barrier
*ibarrier
30 = (union sparc_pthread_barrier
*) barrier
;
32 int private = ibarrier
->s
.pshared
? LLL_SHARED
: LLL_PRIVATE
;
34 /* Make sure we are alone. */
35 lll_lock (ibarrier
->b
.lock
, private);
37 /* One more arrival. */
41 if (ibarrier
->b
.left
== 0)
43 /* Yes. Increment the event counter to avoid invalid wake-ups and
44 tell the current waiters that it is their turn. */
45 ++ibarrier
->b
.curr_event
;
47 /* Wake up everybody. */
48 lll_futex_wake (&ibarrier
->b
.curr_event
, INT_MAX
, private);
50 /* This is the thread which finished the serialization. */
51 result
= PTHREAD_BARRIER_SERIAL_THREAD
;
55 /* The number of the event we are waiting for. The barrier's event
56 number must be bumped before we continue. */
57 unsigned int event
= ibarrier
->b
.curr_event
;
59 /* Before suspending, make the barrier available to others. */
60 lll_unlock (ibarrier
->b
.lock
, private);
62 /* Wait for the event counter of the barrier to change. */
64 lll_futex_wait (&ibarrier
->b
.curr_event
, event
, private);
65 while (event
== ibarrier
->b
.curr_event
);
68 /* Make sure the init_count is stored locally or in a register. */
69 unsigned int init_count
= ibarrier
->b
.init_count
;
71 /* If this was the last woken thread, unlock. */
72 if (atomic_increment_val (&ibarrier
->b
.left
) == init_count
)
74 lll_unlock (ibarrier
->b
.lock
, private);