1 /* sem_post -- post to a POSIX semaphore. Powerpc version.
2 Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
22 #include <lowlevellock.h>
23 #include <internaltypes.h>
24 #include <semaphore.h>
29 struct new_sem *isem = (struct new_sem *) sem;
31 __asm__ __volatile__ (__lll_rel_instr ::: "memory");
32 atomic_increment (&isem->value);
33 __asm__ __volatile__ (__lll_acq_instr ::: "memory");
34 if (isem->nwaiters > 0)
36 int err = lll_futex_wake (&isem->value, 1,
37 isem->private ^ FUTEX_PRIVATE_FLAG);
38 if (__builtin_expect (err, 0) < 0)