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/* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.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 <atomic.h>
#include <kernel-features.h>
#define SYS_futex 238
#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)
#define FUTEX_LOCK_PI 6
#define FUTEX_UNLOCK_PI 7
#define FUTEX_TRYLOCK_PI 8
#define FUTEX_PRIVATE_FLAG 128
/* Values for 'private' parameter of locking macros. Yes, the
definition seems to be backwards. But it is not. The bit will be
reversed before passing to the system call. */
#define LLL_PRIVATE 0
#define LLL_SHARED FUTEX_PRIVATE_FLAG
#if !defined NOT_IN_libc || defined IS_IN_rtld
/* In libc.so or ld.so all futexes are private. */
# ifdef __ASSUME_PRIVATE_FUTEX
# define __lll_private_flag(fl, private) \
((fl) | FUTEX_PRIVATE_FLAG)
# else
# define __lll_private_flag(fl, private) \
((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
# endif
#else
# ifdef __ASSUME_PRIVATE_FUTEX
# define __lll_private_flag(fl, private) \
(((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
# else
# define __lll_private_flag(fl, private) \
(__builtin_constant_p (private) \
? ((private) == 0 \
? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
: (fl)) \
: ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG) \
& THREAD_GETMEM (THREAD_SELF, header.private_futex))))
# endif
#endif
#define lll_futex_wait(futex, val, private) \
lll_futex_timed_wait (futex, val, NULL, private)
#define lll_futex_timed_wait(futex, val, timespec, private) \
({ \
register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
register unsigned long int __r3 asm ("3") \
= __lll_private_flag (FUTEX_WAIT, private); \
register unsigned long int __r4 asm ("4") = (unsigned long int) (val); \
register unsigned long int __r5 asm ("5") = (unsigned long int)(timespec);\
register unsigned long int __result asm ("2"); \
\
__asm __volatile ("svc %b1" \
: "=d" (__result) \
: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
"d" (__r4), "d" (__r5) \
: "cc", "memory" ); \
__result; \
})
#define lll_futex_wake(futex, nr, private) \
({ \
register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
register unsigned long int __r3 asm ("3") \
= __lll_private_flag (FUTEX_WAKE, private); \
register unsigned long int __r4 asm ("4") = (unsigned long int) (nr); \
register unsigned long int __result asm ("2"); \
\
__asm __volatile ("svc %b1" \
: "=d" (__result) \
: "i" (SYS_futex), "0" (__r2), "d" (__r3), "d" (__r4) \
: "cc", "memory" ); \
__result; \
})
#define lll_robust_dead(futexv, private) \
do \
{ \
int *__futexp = &(futexv); \
\
atomic_or (__futexp, FUTEX_OWNER_DIED); \
lll_futex_wake (__futexp, 1, private); \
} \
while (0)
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_requeue(futex, nr_wake, nr_move, mutex, val, private) \
({ \
register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
register unsigned long int __r3 asm ("3") \
= __lll_private_flag (FUTEX_CMP_REQUEUE, private); \
register unsigned long int __r4 asm ("4") = (long int) (nr_wake); \
register unsigned long int __r5 asm ("5") = (long int) (nr_move); \
register unsigned long int __r6 asm ("6") = (unsigned long int) (mutex); \
register unsigned long int __r7 asm ("7") = (int) (val); \
register unsigned long __result asm ("2"); \
\
__asm __volatile ("svc %b1" \
: "=d" (__result) \
: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
"d" (__r4), "d" (__r5), "d" (__r6), "d" (__r7) \
: "cc", "memory" ); \
__result > -4096UL; \
})
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_wake_unlock(futex, nr_wake, nr_wake2, futex2, private) \
({ \
register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
register unsigned long int __r3 asm ("3") \
= __lll_private_flag (FUTEX_WAKE_OP, private); \
register unsigned long int __r4 asm ("4") = (long int) (nr_wake); \
register unsigned long int __r5 asm ("5") = (long int) (nr_wake2); \
register unsigned long int __r6 asm ("6") = (unsigned long int) (futex2); \
register unsigned long int __r7 asm ("7") \
= (int) FUTEX_OP_CLEAR_WAKE_IF_GT_ONE; \
register unsigned long __result asm ("2"); \
\
__asm __volatile ("svc %b1" \
: "=d" (__result) \
: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
"d" (__r4), "d" (__r5), "d" (__r6), "d" (__r7) \
: "cc", "memory" ); \
__result > -4096UL; \
})
#define lll_compare_and_swap(futex, oldval, newval, operation) \
do { \
__typeof (futex) __futex = (futex); \
__asm __volatile (" l %1,%0\n" \
"0: " operation "\n" \
" cs %1,%2,%0\n" \
" jl 0b\n" \
"1:" \
: "=Q" (*__futex), "=&d" (oldval), "=&d" (newval) \
: "m" (*__futex) : "cc", "memory" ); \
} while (0)
static inline int
__attribute__ ((always_inline))
__lll_trylock (int *futex)
{
unsigned int old;
__asm __volatile ("cs %0,%3,%1"
: "=d" (old), "=Q" (*futex)
: "0" (0), "d" (1), "m" (*futex) : "cc", "memory" );
return old != 0;
}
#define lll_trylock(futex) __lll_trylock (&(futex))
static inline int
__attribute__ ((always_inline))
__lll_cond_trylock (int *futex)
{
unsigned int old;
__asm __volatile ("cs %0,%3,%1"
: "=d" (old), "=Q" (*futex)
: "0" (0), "d" (2), "m" (*futex) : "cc", "memory" );
return old != 0;
}
#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex))
static inline int
__attribute__ ((always_inline))
__lll_robust_trylock (int *futex, int id)
{
unsigned int old;
__asm __volatile ("cs %0,%3,%1"
: "=d" (old), "=Q" (*futex)
: "0" (0), "d" (id), "m" (*futex) : "cc", "memory" );
return old != 0;
}
#define lll_robust_trylock(futex, id) \
__lll_robust_trylock (&(futex), id)
extern void __lll_lock_wait_private (int *futex) attribute_hidden;
extern void __lll_lock_wait (int *futex, int private) attribute_hidden;
extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden;
static inline void
__attribute__ ((always_inline))
__lll_lock (int *futex, int private)
{
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, 1, 0), 0))
{
if (__builtin_constant_p (private) && private == LLL_PRIVATE)
__lll_lock_wait_private (futex);
else
__lll_lock_wait (futex, private);
}
}
#define lll_lock(futex, private) __lll_lock (&(futex), private)
static inline int
__attribute__ ((always_inline))
__lll_robust_lock (int *futex, int id, int private)
{
int result = 0;
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, id, 0),
0))
result = __lll_robust_lock_wait (futex, private);
return result;
}
#define lll_robust_lock(futex, id, private) \
__lll_robust_lock (&(futex), id, private)
static inline void
__attribute__ ((always_inline))
__lll_cond_lock (int *futex, int private)
{
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, 2, 0), 0))
__lll_lock_wait (futex, private);
}
#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)
#define lll_robust_cond_lock(futex, id, private) \
__lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private)
extern int __lll_timedlock_wait
(int *futex, const struct timespec *, int private) attribute_hidden;
extern int __lll_robust_timedlock_wait
(int *futex, const struct timespec *, int private) attribute_hidden;
static inline int
__attribute__ ((always_inline))
__lll_timedlock (int *futex, const struct timespec *abstime, int private)
{
int result = 0;
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, 1, 0), 0))
result = __lll_timedlock_wait (futex, abstime, private);
return result;
}
#define lll_timedlock(futex, abstime, private) \
__lll_timedlock (&(futex), abstime, private)
static inline int
__attribute__ ((always_inline))
__lll_robust_timedlock (int *futex, const struct timespec *abstime,
int id, int private)
{
int result = 0;
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, id, 0),
0))
result = __lll_robust_timedlock_wait (futex, abstime, private);
return result;
}
#define lll_robust_timedlock(futex, abstime, id, private) \
__lll_robust_timedlock (&(futex), abstime, id, private)
#define __lll_unlock(futex, private) \
(void) \
({ int __oldval; \
int __newval = 0; \
int *__futexp = (futex); \
\
lll_compare_and_swap (__futexp, __oldval, __newval, "slr %2,%2"); \
if (__builtin_expect (__oldval > 1, 0)) \
lll_futex_wake (__futexp, 1, private); \
})
#define lll_unlock(futex, private) __lll_unlock(&(futex), private)
#define __lll_robust_unlock(futex, private) \
(void) \
({ int __oldval; \
int __newval = 0; \
int *__futexp = (futex); \
\
lll_compare_and_swap (__futexp, __oldval, __newval, "slr %2,%2"); \
if (__builtin_expect (__oldval & FUTEX_WAITERS, 0)) \
lll_futex_wake (__futexp, 1, private); \
})
#define lll_robust_unlock(futex, private) \
__lll_robust_unlock(&(futex), private)
#define lll_islocked(futex) \
(futex != 0)
/* Initializers for lock. */
#define LLL_LOCK_INITIALIZER (0)
#define LLL_LOCK_INITIALIZER_LOCKED (1)
/* 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(ptid) \
do \
{ \
int __tid; \
\
while ((__tid = *ptid) != 0) \
lll_futex_wait (ptid, __tid, LLL_SHARED); \
} \
while (0)
#define lll_wait_tid(tid) __lll_wait_tid(&(tid))
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; \
})
#endif /* lowlevellock.h */
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