powerpc: Fix fesetexceptflag [BZ#17885]
[glibc.git] / nptl / sem_init.c
blob575b661f624cbb2aff0bf6f18187e063e9655443
1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <errno.h>
20 #include <semaphore.h>
21 #include <shlib-compat.h>
22 #include "semaphoreP.h"
23 #include <kernel-features.h>
25 /* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported;
26 returns FUTEX_SHARED otherwise.
27 TODO Remove when cleaning up the futex API throughout glibc. */
28 static __always_inline int
29 futex_private_if_supported (int pshared)
31 if (pshared != 0)
32 return LLL_SHARED;
33 #ifdef __ASSUME_PRIVATE_FUTEX
34 return LLL_PRIVATE;
35 #else
36 return THREAD_GETMEM (THREAD_SELF, header.private_futex)
37 ^ FUTEX_PRIVATE_FLAG;
38 #endif
42 int
43 __new_sem_init (sem_t *sem, int pshared, unsigned int value)
45 /* Parameter sanity check. */
46 if (__glibc_unlikely (value > SEM_VALUE_MAX))
48 __set_errno (EINVAL);
49 return -1;
52 /* Map to the internal type. */
53 struct new_sem *isem = (struct new_sem *) sem;
55 /* Use the values the caller provided. */
56 #if __HAVE_64B_ATOMICS
57 isem->data = value;
58 #else
59 isem->value = value << SEM_VALUE_SHIFT;
60 isem->nwaiters = 0;
61 #endif
63 isem->private = futex_private_if_supported (pshared);
65 return 0;
67 versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1);
71 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
72 int
73 attribute_compat_text_section
74 __old_sem_init (sem, pshared, value)
75 sem_t *sem;
76 int pshared;
77 unsigned int value;
79 /* Parameter sanity check. */
80 if (__glibc_unlikely (value > SEM_VALUE_MAX))
82 __set_errno (EINVAL);
83 return -1;
86 /* Map to the internal type. */
87 struct old_sem *isem = (struct old_sem *) sem;
89 /* Use the value the user provided. */
90 isem->value = value;
92 /* We cannot store the PSHARED attribute. So we always use the
93 operations needed for shared semaphores. */
95 return 0;
97 compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0);
98 #endif