126 lines
4.7 KiB
C
126 lines
4.7 KiB
C
/* Low-level lock implementation. High-level Hurd helpers.
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Copyright (C) 1999-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _HURD_LOCK_H
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#define _HURD_LOCK_H 1
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#include <mach/lowlevellock.h>
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struct timespec;
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/* Flags for robust locks. */
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#define LLL_WAITERS (1U << 31)
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#define LLL_DEAD_OWNER (1U << 30)
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#define LLL_OWNER_MASK ~(LLL_WAITERS | LLL_DEAD_OWNER)
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/* Wait on 64-bit address PTR, without blocking if its contents
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are different from the pair <LO, HI>. */
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#define lll_xwait(ptr, lo, hi, flags) \
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__gsync_wait (__mach_task_self (), \
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(vm_offset_t)ptr, lo, hi, 0, flags | GSYNC_QUAD)
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/* Same as 'lll_wait', but only block for MLSEC milliseconds. */
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#define lll_timed_wait(ptr, val, mlsec, flags) \
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__gsync_wait (__mach_task_self (), \
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(vm_offset_t)ptr, val, 0, mlsec, flags | GSYNC_TIMED)
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/* Same as 'lll_xwait', but only block for MLSEC milliseconds. */
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#define lll_timed_xwait(ptr, lo, hi, mlsec, flags) \
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__gsync_wait (__mach_task_self (), (vm_offset_t)ptr, \
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lo, hi, mlsec, flags | GSYNC_TIMED | GSYNC_QUAD)
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/* Same as 'lll_wait', but only block until TSP elapses,
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using clock CLK. */
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extern int __lll_abstimed_wait (void *__ptr, int __val,
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const struct timespec *__tsp, int __flags, int __clk);
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/* Same as 'lll_xwait', but only block until TSP elapses,
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using clock CLK. */
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extern int __lll_abstimed_xwait (void *__ptr, int __lo, int __hi,
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const struct timespec *__tsp, int __flags, int __clk);
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/* Same as 'lll_lock', but return with an error if TSP elapses,
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using clock CLK. */
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extern int __lll_abstimed_lock (void *__ptr,
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const struct timespec *__tsp, int __flags, int __clk);
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/* Acquire the lock at PTR, but return with an error if
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the process containing the owner thread dies. */
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extern int __lll_robust_lock (void *__ptr, int __flags);
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/* Same as '__lll_robust_lock', but only block until TSP
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elapses, using clock CLK. */
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extern int __lll_robust_abstimed_lock (void *__ptr,
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const struct timespec *__tsp, int __flags, int __clk);
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/* Same as '__lll_robust_lock', but return with an error
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if the lock cannot be acquired without blocking. */
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extern int __lll_robust_trylock (void *__ptr);
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/* Wake one or more threads waiting on address PTR,
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setting its value to VAL before doing so. */
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#define lll_set_wake(ptr, val, flags) \
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__gsync_wake (__mach_task_self (), \
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(vm_offset_t)ptr, val, flags | GSYNC_MUTATE)
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/* Release the robust lock at PTR. */
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extern void __lll_robust_unlock (void *__ptr, int __flags);
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/* Rearrange threads waiting on address SRC to instead wait on
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DST, waking one of them if WAIT_ONE is non-zero. */
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#define lll_requeue(src, dst, wake_one, flags) \
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__gsync_requeue (__mach_task_self (), (vm_offset_t)src, \
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(vm_offset_t)dst, (boolean_t)wake_one, flags)
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/* The following are hacks that allow us to simulate optional
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parameters in C, to avoid having to pass the clock id for
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every one of these calls, defaulting to CLOCK_REALTIME if
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no argument is passed. */
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#define lll_abstimed_wait(ptr, val, tsp, flags, ...) \
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({ \
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const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
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__lll_abstimed_wait ((ptr), (val), (tsp), (flags), \
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__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
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})
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#define lll_abstimed_xwait(ptr, lo, hi, tsp, flags, ...) \
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({ \
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const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
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__lll_abstimed_xwait ((ptr), (lo), (hi), (tsp), (flags), \
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__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
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})
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#define lll_abstimed_lock(ptr, tsp, flags, ...) \
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({ \
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const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
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__lll_abstimed_lock ((ptr), (tsp), (flags), \
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__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
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})
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#define lll_robust_abstimed_lock(ptr, tsp, flags, ...) \
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({ \
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const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \
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__lll_robust_abstimed_lock ((ptr), (tsp), (flags), \
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__clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \
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})
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#endif
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