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_trywait.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 nptl/sem_trywait.c (limited to 'nptl/sem_trywait.c') diff --git a/nptl/sem_trywait.c b/nptl/sem_trywait.c new file mode 100644 index 0000000000..94c323c18e --- /dev/null +++ b/nptl/sem_trywait.c @@ -0,0 +1,50 @@ +/* sem_trywait -- wait on a semaphore. Generic futex-using version. + Copyright (C) 2003-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Paul Mackerras , 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_trywait (sem_t *sem) +{ + int *futex = (int *) sem; + int val; + + if (*futex > 0) + { + val = atomic_decrement_if_positive (futex); + if (val > 0) + return 0; + } + + __set_errno (EAGAIN); + return -1; +} +versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1); +#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) +strong_alias (__new_sem_trywait, __old_sem_trywait) +compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0); +#endif -- cgit v1.2.3