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/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _LOWLEVELLOCK_H
#define _LOWLEVELLOCK_H 1
#include <time.h>
#include <sys/param.h>
#include <bits/pthreadtypes.h>
#include <ia64intrin.h>
#include <atomic.h>
#define __NR_futex 1230
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
#define FUTEX_WAKE_OP 5
#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
/* Delay in spinlock loop. */
#define BUSY_WAIT_NOP asm ("hint @pause")
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define lll_futex_wait(futex, val) lll_futex_timed_wait (futex, val, 0)
#define lll_futex_timed_wait(ftx, val, timespec) \
({ \
DO_INLINE_SYSCALL(futex, 4, (long) (ftx), FUTEX_WAIT, (int) (val), \
(long) (timespec)); \
_r10 == -1 ? -_retval : _retval; \
})
#define lll_futex_wake(ftx, nr) \
({ \
DO_INLINE_SYSCALL(futex, 3, (long) (ftx), FUTEX_WAKE, (int) (nr)); \
_r10 == -1 ? -_retval : _retval; \
})
#define lll_robust_mutex_dead(futexv) \
do \
{ \
int *__futexp = &(futexv); \
atomic_or (__futexp, FUTEX_OWNER_DIED); \
DO_INLINE_SYSCALL(futex, 3, (long) __futexp, FUTEX_WAKE, 1); \
} \
while (0)
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val) \
({ \
DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_CMP_REQUEUE, \
(int) (nr_wake), (int) (nr_move), (long) (mutex), \
(int) val); \
_r10 == -1; \
})
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_wake_unlock(ftx, nr_wake, nr_wake2, ftx2) \
({ \
DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_WAKE_OP, \
(int) (nr_wake), (int) (nr_wake2), (long) (ftx2), \
FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
_r10 == -1; \
})
#define __lll_mutex_trylock(futex) \
(atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0)
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
#define __lll_robust_mutex_trylock(futex, id) \
(atomic_compare_and_exchange_val_acq (futex, id, 0) != 0)
#define lll_robust_mutex_trylock(futex, id) \
__lll_robust_mutex_trylock (&(futex), id)
#define __lll_mutex_cond_trylock(futex) \
(atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)
#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
extern void __lll_lock_wait (int *futex) attribute_hidden;
extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
#define __lll_mutex_lock(futex) \
((void) ({ \
int *__futex = (futex); \
if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \
__lll_lock_wait (__futex); \
}))
#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
#define __lll_robust_mutex_lock(futex, id) \
({ \
int *__futex = (futex); \
int __val = 0; \
\
if (atomic_compare_and_exchange_bool_acq (__futex, id, 0) != 0) \
__val = __lll_robust_lock_wait (__futex); \
__val; \
}))
#define lll_robust_mutex_lock(futex, id) __lll_robust_mutex_lock (&(futex), id)
#define __lll_mutex_cond_lock(futex) \
((void) ({ \
int *__futex = (futex); \
if (atomic_compare_and_exchange_bool_acq (__futex, 2, 0) != 0) \
__lll_lock_wait (__futex); \
}))
#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
#define __lll_robust_mutex_cond_lock(futex, id) \
({ \
int *__futex = (futex); \
int __val = 0; \
int __id = (id) | FUTEX_WAITERS; \
\
if (atomic_compare_and_exchange_bool_acq (__futex, __id, 0) != 0) \
__val = __lll_robust_lock_wait (__futex); \
__val; \
}))
#define lll_robust_mutex_cond_lock(futex, id) \
__lll_robust_mutex_cond_lock (&(futex), id)
extern int __lll_timedlock_wait (int *futex, const struct timespec *)
attribute_hidden;
extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *)
attribute_hidden;
#define __lll_mutex_timedlock(futex, abstime) \
({ \
int *__futex = (futex); \
int __val = 0; \
\
if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \
__val = __lll_timedlock_wait (__futex, abstime); \
__val; \
})
#define lll_mutex_timedlock(futex, abstime) \
__lll_mutex_timedlock (&(futex), abstime)
#define __lll_robust_mutex_timedlock(futex, abstime, id) \
({ \
int *__futex = (futex); \
int __val = 0; \
\
if (atomic_compare_and_exchange_bool_acq (__futex, id, 0) != 0) \
__val = __lll_robust_timedlock_wait (__futex, abstime); \
__val; \
}))
#define lll_robust_mutex_timedlock(futex, abstime, id) \
__lll_robust_mutex_timedlock (&(futex), abstime, id)
#define __lll_mutex_unlock(futex) \
((void) ({ \
int *__futex = (futex); \
int __val = atomic_exchange_rel (__futex, 0); \
\
if (__builtin_expect (__val > 1, 0)) \
lll_futex_wake (__futex, 1); \
}))
#define lll_mutex_unlock(futex) \
__lll_mutex_unlock(&(futex))
#define __lll_robust_mutex_unlock(futex) \
((void) ({ \
int *__futex = (futex); \
int __val = atomic_exchange_rel (__futex, 0); \
\
if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \
lll_futex_wake (__futex, 1); \
}))
#define lll_robust_mutex_unlock(futex) \
__lll_robust_mutex_unlock(&(futex))
#define __lll_mutex_unlock_force(futex) \
((void) ({ \
int *__futex = (futex); \
(void) atomic_exchange_rel (__futex, 0); \
lll_futex_wake (__futex, 1); \
}))
#define lll_mutex_unlock_force(futex) \
__lll_mutex_unlock_force(&(futex))
#define lll_mutex_islocked(futex) \
(futex != 0)
/* We have a separate internal lock implementation which is not tied
to binary compatibility. We can use the lll_mutex_*. */
/* Type for lock object. */
typedef int lll_lock_t;
extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
/* Initializers for lock. */
#define LLL_LOCK_INITIALIZER (0)
#define LLL_LOCK_INITIALIZER_LOCKED (1)
#define lll_trylock(futex) lll_mutex_trylock (futex)
#define lll_lock(futex) lll_mutex_lock (futex)
#define lll_unlock(futex) lll_mutex_unlock (futex)
#define lll_islocked(futex) lll_mutex_islocked (futex)
/* The kernel notifies a process with uses CLONE_CLEARTID via futex
wakeup when the clone terminates. The memory location contains the
thread ID while the clone is running and is reset to zero
afterwards. */
#define lll_wait_tid(tid) \
do \
{ \
__typeof (tid) __tid; \
while ((__tid = (tid)) != 0) \
lll_futex_wait (&(tid), __tid); \
} \
while (0)
extern int __lll_timedwait_tid (int *, const struct timespec *)
attribute_hidden;
#define lll_timedwait_tid(tid, abstime) \
({ \
int __res = 0; \
if ((tid) != 0) \
__res = __lll_timedwait_tid (&(tid), (abstime)); \
__res; \
})
/* Conditional variable handling. */
extern void __lll_cond_wait (pthread_cond_t *cond)
attribute_hidden;
extern int __lll_cond_timedwait (pthread_cond_t *cond,
const struct timespec *abstime)
attribute_hidden;
extern void __lll_cond_wake (pthread_cond_t *cond)
attribute_hidden;
extern void __lll_cond_broadcast (pthread_cond_t *cond)
attribute_hidden;
#define lll_cond_wait(cond) \
__lll_cond_wait (cond)
#define lll_cond_timedwait(cond, abstime) \
__lll_cond_timedwait (cond, abstime)
#define lll_cond_wake(cond) \
__lll_cond_wake (cond)
#define lll_cond_broadcast(cond) \
__lll_cond_broadcast (cond)
#endif /* lowlevellock.h */
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