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/* Copyright (C) 2003 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 SYS_futex 1230
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define lll_futex_clobbers \
"out5", "out6", "out7", \
/* Non-stacked integer registers, minus r8, r10, r15. */ \
"r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", \
"r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", \
"r28", "r29", "r30", "r31", \
/* Predicate registers. */ \
"p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", \
/* Non-rotating fp registers. */ \
"f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
/* Branch registers. */ \
"b6", "b7", \
"memory"
#define lll_futex_wait(futex, val) lll_futex_timed_wait (futex, val, 0)
#define lll_futex_timed_wait(futex, val, timespec) \
({ \
register long int __o0 asm ("out0") = (long int) (futex); \
register long int __o1 asm ("out1") = FUTEX_WAIT; \
register long int __o2 asm ("out2") = (long int) (val); \
register long int __o3 asm ("out3") = (long int) (timespec); \
register long int __r8 asm ("r8"); \
register long int __r10 asm ("r10"); \
register long int __r15 asm ("r15") = SYS_futex; \
\
__asm __volatile ("break %7;;" \
: "=r" (__r8), "=r" (__r10), "=r" (__r15), \
"=r" (__o0), "=r" (__o1), "=r" (__o2), "=r" (__o3) \
: "i" (0x100000), "2" (__r15), "3" (__o0), "4" (__o1), \
"5" (__o2), "6" (__o3) \
: "out4", lll_futex_clobbers); \
__r10 == -1 ? -__r8 : __r8; \
})
#define lll_futex_wake(futex, nr) \
({ \
register long int __o0 asm ("out0") = (long int) (futex); \
register long int __o1 asm ("out1") = FUTEX_WAKE; \
register long int __o2 asm ("out2") = (long int) (nr); \
register long int __r8 asm ("r8"); \
register long int __r10 asm ("r10"); \
register long int __r15 asm ("r15") = SYS_futex; \
\
__asm __volatile ("break %6;;" \
: "=r" (__r8), "=r" (__r10), "=r" (__r15), \
"=r" (__o0), "=r" (__o1), "=r" (__o2) \
: "i" (0x100000), "2" (__r15), "3" (__o0), "4" (__o1), \
"5" (__o2) \
: "out3", "out4", lll_futex_clobbers); \
__r10 == -1 ? -__r8 : __r8; \
})
#define lll_futex_requeue(futex, nr_wake, nr_move, mutex) \
({ \
register long int __o0 asm ("out0") = (long int) (futex); \
register long int __o1 asm ("out1") = FUTEX_REQUEUE; \
register long int __o2 asm ("out2") = (long int) (nr_wake); \
register long int __o3 asm ("out3") = (long int) (nr_move); \
register long int __o4 asm ("out4") = (long int) (mutex); \
register long int __r8 asm ("r8"); \
register long int __r10 asm ("r10"); \
register long int __r15 asm ("r15") = SYS_futex; \
\
__asm __volatile ("break %8;;" \
: "=r" (__r8), "=r" (__r10), "=r" (__r15), \
"=r" (__o0), "=r" (__o1), "=r" (__o2), "=r" (__o3), \
"=r" (__o4) \
: "i" (0x100000), "2" (__r15), "3" (__o0), "4" (__o1), \
"5" (__o2), "6" (__o3), "7" (__o4) \
: lll_futex_clobbers); \
__r10 == -1 ? -__r8 : __r8; \
})
static inline int
__attribute__ ((always_inline))
__lll_mutex_trylock (int *futex)
{
return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
}
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
extern void __lll_lock_wait (int *futex, int val) attribute_hidden;
static inline void
__attribute__ ((always_inline))
__lll_mutex_lock (int *futex)
{
int val = atomic_exchange_and_add (futex, 1);
if (__builtin_expect (val != 0, 0))
__lll_lock_wait (futex, val);
}
#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
static inline void
__attribute__ ((always_inline))
__lll_mutex_cond_lock (int *futex)
{
int val = atomic_exchange_and_add (futex, 2);
if (__builtin_expect (val != 0, 0))
/* Note, the val + 1 is kind of ugly here. __lll_lock_wait will add
1 again. But we added 2 to the futex value so this is the right
value which will be passed to the kernel. */
__lll_lock_wait (futex, val + 1);
}
#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
extern int __lll_timedlock_wait (int *futex, int val, const struct timespec *)
attribute_hidden;
static inline int
__attribute__ ((always_inline))
__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
{
int val = atomic_exchange_and_add (futex, 1);
int result = 0;
if (__builtin_expect (val != 0, 0))
result = __lll_timedlock_wait (futex, val, abstime);
return result;
}
#define lll_mutex_timedlock(futex, abstime) \
__lll_mutex_timedlock (&(futex), abstime)
static inline void
__attribute__ ((always_inline))
__lll_mutex_unlock (int *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))
static inline void
__attribute__ ((always_inline))
__lll_mutex_unlock_force (int *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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