| /* Low-level locking access to futex facilities. Stub version. |
| Copyright (C) 2014-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _LOWLEVELLOCK_FUTEX_H |
| #define _LOWLEVELLOCK_FUTEX_H 1 |
| |
| #include <errno.h> |
| |
| |
| /* Values for 'private' parameter of locking macros. Note pthreadP.h |
| optimizes for these exact values, though they are not required. */ |
| #define LLL_PRIVATE 0 |
| #define LLL_SHARED 128 |
| |
| |
| /* For most of these macros, the return value is never really used. |
| Nevertheless, the protocol is that each one returns a negated errno |
| code for failure or zero for success. (Note that the corresponding |
| Linux system calls can sometimes return positive values for success |
| cases too. We never use those values.) */ |
| |
| |
| /* Wait while *FUTEXP == VAL for an lll_futex_wake call on FUTEXP. */ |
| #define lll_futex_wait(futexp, val, private) \ |
| lll_futex_timed_wait (futexp, val, NULL, private) |
| |
| /* Wait until a lll_futex_wake call on FUTEXP, or TIMEOUT elapses. */ |
| #define lll_futex_timed_wait(futexp, val, timeout, private) \ |
| -ENOSYS |
| |
| /* This macro should be defined only if FUTEX_CLOCK_REALTIME is also defined. |
| If CLOCKBIT is zero, this is identical to lll_futex_timed_wait. |
| If CLOCKBIT has FUTEX_CLOCK_REALTIME set, then it's the same but |
| TIMEOUT is counted by CLOCK_REALTIME rather than CLOCK_MONOTONIC. */ |
| #define lll_futex_timed_wait_bitset(futexp, val, timeout, clockbit, private) \ |
| -ENOSYS |
| |
| /* Wake up up to NR waiters on FUTEXP. */ |
| #define lll_futex_wake(futexp, nr, private) \ |
| -ENOSYS |
| |
| /* Wake up up to NR_WAKE waiters on FUTEXP. Move up to NR_MOVE of the |
| rest from waiting on FUTEXP to waiting on MUTEX (a different futex). */ |
| #define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \ |
| -ENOSYS |
| |
| /* Wake up up to NR_WAKE waiters on FUTEXP and NR_WAKE2 on FUTEXP2. */ |
| #define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \ |
| -ENOSYS |
| |
| |
| /* Like lll_futex_wait (FUTEXP, VAL, PRIVATE) but with the expectation |
| that lll_futex_cmp_requeue_pi (FUTEXP, _, _, MUTEX, _, PRIVATE) will |
| be used to do the wakeup. Confers priority-inheritance behavior on |
| the waiter. */ |
| #define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \ |
| lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private) |
| |
| /* Like lll_futex_wait_requeue_pi, but with a timeout. */ |
| #define lll_futex_timed_wait_requeue_pi(futexp, val, timeout, clockbit, \ |
| mutex, private) \ |
| -ENOSYS |
| |
| /* Like lll_futex_requeue, but pairs with lll_futex_wait_requeue_pi |
| and inherits priority from the waiter. */ |
| #define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, \ |
| val, private) \ |
| -ENOSYS |
| |
| |
| #endif /* lowlevellock-futex.h */ |
