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Diffstat (limited to 'libgomp/config/linux/sem.h')
-rw-r--r-- | libgomp/config/linux/sem.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/libgomp/config/linux/sem.h b/libgomp/config/linux/sem.h new file mode 100644 index 000000000..9b0f0f82b --- /dev/null +++ b/libgomp/config/linux/sem.h @@ -0,0 +1,57 @@ +/* Copyright (C) 2005, 2009 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* This is a Linux specific implementation of a semaphore synchronization + mechanism for libgomp. This type is private to the library. This + implementation uses atomic instructions and the futex syscall. */ + +#ifndef GOMP_SEM_H +#define GOMP_SEM_H 1 + +typedef int gomp_sem_t; + +static inline void gomp_sem_init (gomp_sem_t *sem, int value) +{ + *sem = value; +} + +extern void gomp_sem_wait_slow (gomp_sem_t *); +static inline void gomp_sem_wait (gomp_sem_t *sem) +{ + if (!__sync_bool_compare_and_swap (sem, 1, 0)) + gomp_sem_wait_slow (sem); +} + +extern void gomp_sem_post_slow (gomp_sem_t *); +static inline void gomp_sem_post (gomp_sem_t *sem) +{ + if (!__sync_bool_compare_and_swap (sem, 0, 1)) + gomp_sem_post_slow (sem); +} + +static inline void gomp_sem_destroy (gomp_sem_t *sem) +{ +} + +#endif /* GOMP_SEM_H */ |