mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
88 lines
4.1 KiB
C
88 lines
4.1 KiB
C
/* Low-level locking access to futex facilities. NaCl version.
|
|
Copyright (C) 2015 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 <nacl-interfaces.h>
|
|
#include <time.h>
|
|
|
|
|
|
#pragma GCC diagnostic ignored "-Wunused-value" /* XXX */
|
|
|
|
/* 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
|
|
|
|
#define FUTEX_PRIVATE_FLAG 0 /* XXX */
|
|
|
|
|
|
/* Wait while *FUTEXP == VAL for an lll_futex_wake call on FUTEXP. */
|
|
#define lll_futex_wait(futexp, val, private) \
|
|
(- __nacl_irt_futex.futex_wait_abs ((volatile int *) (futexp), val, NULL))
|
|
|
|
/* Wait until a lll_futex_wake call on FUTEXP, or TIMEOUT elapses. */
|
|
#define lll_futex_timed_wait(futexp, val, timeout, private) \
|
|
({ \
|
|
/* This timeout is relative, but the IRT call wants it absolute. */\
|
|
const struct timespec *_to = (timeout); \
|
|
struct timespec _ts; \
|
|
int _err = 0; \
|
|
if (_to != NULL \
|
|
&& __glibc_likely ((_err = __nacl_irt_clock.clock_gettime \
|
|
(CLOCK_REALTIME, &_ts)) == 0)) \
|
|
{ \
|
|
_ts.tv_sec += _to->tv_sec; \
|
|
_ts.tv_nsec += _to->tv_nsec; \
|
|
while (_ts.tv_nsec >= 1000000000) \
|
|
{ \
|
|
_ts.tv_nsec -= 1000000000; \
|
|
++_ts.tv_sec; \
|
|
} \
|
|
_to = &_ts; \
|
|
} \
|
|
if (_err == 0) \
|
|
_err = __nacl_irt_futex.futex_wait_abs \
|
|
((volatile int *) (futexp), val, _to); \
|
|
-_err; \
|
|
})
|
|
|
|
/* Wake up up to NR waiters on FUTEXP. */
|
|
#define lll_futex_wake(futexp, nr, private) \
|
|
({ \
|
|
int _woken; \
|
|
- __nacl_irt_futex.futex_wake ((volatile int *) (futexp), nr, &_woken); \
|
|
})
|
|
|
|
/* NaCl does not support the requeue operation. The only use of this is in
|
|
pthread_cond_broadcast, which handles an error return by falling back to
|
|
plain lll_futex_wake. */
|
|
#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
|
|
((futexp), (nr_wake), (nr_move), (mutex), (val), (private), -ENOSYS)
|
|
|
|
/* NaCl does not support the special wake-unlock operation. The only use
|
|
of this is in pthread_cond_signal, which handles an error return by
|
|
falling back to plain lll_futex_wake. */
|
|
/* 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) \
|
|
((futexp), (nr_wake), (nr_wake2), (futexp2), (private), -ENOSYS)
|
|
|
|
|
|
#endif /* lowlevellock-futex.h */
|