From 08192659bbeae149e7cb1f4c43547257f7099bb0 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Mon, 7 Jul 2014 09:28:38 -0700 Subject: Get rid of nptl/sysdeps/ entirely! --- nptl/sem_post.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 nptl/sem_post.c (limited to 'nptl/sem_post.c') diff --git a/nptl/sem_post.c b/nptl/sem_post.c new file mode 100644 index 0000000000..4906adf332 --- /dev/null +++ b/nptl/sem_post.c @@ -0,0 +1,80 @@ +/* sem_post -- post to a POSIX semaphore. Generic futex-using version. + Copyright (C) 2003-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek , 2003. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include + +#include + +int +__new_sem_post (sem_t *sem) +{ + struct new_sem *isem = (struct new_sem *) sem; + + __typeof (isem->value) cur; + do + { + cur = isem->value; + if (isem->value == SEM_VALUE_MAX) + { + __set_errno (EOVERFLOW); + return -1; + } + } + while (atomic_compare_and_exchange_bool_rel (&isem->value, cur + 1, cur)); + + atomic_full_barrier (); + if (isem->nwaiters > 0) + { + int err = lll_futex_wake (&isem->value, 1, + isem->private ^ FUTEX_PRIVATE_FLAG); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } + } + return 0; +} +versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1); + + +#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) +int +attribute_compat_text_section +__old_sem_post (sem_t *sem) +{ + int *futex = (int *) sem; + + (void) atomic_increment_val (futex); + /* We always have to assume it is a shared semaphore. */ + int err = lll_futex_wake (futex, 1, LLL_SHARED); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } + return 0; +} +compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0); +#endif -- cgit 1.4.1