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/* Copyright (C) 1999-2016 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 _HURD_LOCK_H
#define _HURD_LOCK_H 1
#include <mach/lowlevellock.h>
struct timespec;
/* Flags for robust locks. */
#define LLL_WAITERS (1U << 31)
#define LLL_DEAD_OWNER (1U << 30)
#define LLL_OWNER_MASK ~(LLL_WAITERS | LLL_DEAD_OWNER)
/* Wait on 64-bit address PTR, without blocking if its contents
* are different from the pair <LO, HI>. */
extern int lll_xwait (void *__ptr, int __lo,
int __hi, int __flags);
/* Same as 'lll_wait', but only block for MLSEC milliseconds. */
extern int lll_timed_wait (void *__ptr, int __val,
int __mlsec, int __flags);
/* Same as 'lll_xwait', but only block for MLSEC milliseconds. */
extern int lll_timed_xwait (void *__ptr, int __lo,
int __hi, int __mlsec, int __flags);
/* Same as 'lll_wait', but only block until TSP elapses,
* using clock CLK. */
extern int __lll_abstimed_wait (void *__ptr, int __val,
const struct timespec *__tsp, int __flags, int __clk);
/* Same as 'lll_xwait', but only block until TSP elapses,
* using clock CLK. */
extern int __lll_abstimed_xwait (void *__ptr, int __lo, int __hi,
const struct timespec *__tsp, int __flags, int __clk);
/* Same as 'lll_lock', but return with an error if TSP elapses,
* using clock CLK. */
extern int __lll_abstimed_lock (void *__ptr,
const struct timespec *__tsp, int __flags, int __clk);
/* Acquire the lock at PTR, but return with an error if
* the process containing the owner thread dies. */
extern int lll_robust_lock (void *__ptr, int __flags);
/* Same as 'lll_robust_lock', but only block until TSP
* elapses, using clock CLK. */
extern int __lll_robust_abstimed_lock (void *__ptr,
const struct timespec *__tsp, int __flags, int __clk);
/* Same as 'lll_robust_lock', but return with an error
* if the lock cannot be acquired without blocking. */
extern int lll_robust_trylock (void *__ptr);
/* Wake one or more threads waiting on address PTR,
* setting its value to VAL before doing so. */
extern void lll_set_wake (void *__ptr, int __val, int __flags);
/* Release the robust lock at PTR. */
extern void lll_robust_unlock (void *__ptr, int __flags);
/* Rearrange threads waiting on address SRC to instead wait on
* DST, waking one of them if WAIT_ONE is non-zero. */
extern void lll_requeue (void *__src, void *__dst,
int __wake_one, int __flags);
/* The following are hacks that allow us to simulate optional
* parameters in C, to avoid having to pass the clock id for
* every one of these calls, defaulting to CLOCK_REALTIME if
* no argument is passed. */
#define lll_abstimed_wait(ptr, val, tsp, flags, ...) \
({ \
const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
__lll_abstimed_wait ((ptr), (val), (tsp), (flags), \
__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
})
#define lll_abstimed_xwait(ptr, lo, hi, tsp, flags, ...) \
({ \
const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
__lll_abstimed_xwait ((ptr), (lo), (hi), (tsp), (flags), \
__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
})
#define lll_abstimed_lock(ptr, tsp, flags, ...) \
({ \
const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
__lll_abstimed_lock ((ptr), (tsp), (flags), \
__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
})
#define lll_robust_abstimed_lock(ptr, tsp, flags, ...) \
({ \
const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
__lll_robust_abstimed_lock ((ptr), (tsp), (flags), \
__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
})
#endif
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