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/* Copyright (C) 2003-2014 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 _LOWLEVELLOCK_H
#define _LOWLEVELLOCK_H 1
#include <time.h>
#include <sys/param.h>
#include <bits/pthreadtypes.h>
#include <sysdep.h>
#include <atomic.h>
#include <kernel-features.h> /* Need __ASSUME_PRIVATE_FUTEX. */
#include <tls.h> /* Need THREAD_*, and header.*. */
/* HPPA only has one atomic read and modify memory operation,
load and clear, so hppa uses a kernel helper routine to implement
compare_and_exchange. See atomic.h for the userspace calling
sequence. */
#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_WAIT_BITSET 9
#define FUTEX_WAKE_BITSET 10
#define FUTEX_WAIT_REQUEUE_PI 11
#define FUTEX_CMP_REQUEUE_PI 12
#define FUTEX_PRIVATE_FLAG 128
#define FUTEX_CLOCK_REALTIME 256
#define FUTEX_BITSET_MATCH_ANY 0xffffffff
/* 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
/* Initialize locks to zero. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#if IS_IN (libc) || 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
/* Type for lock object. */
typedef int lll_lock_t;
#define lll_futex_wait(futexp, val, private) \
lll_futex_timed_wait (futexp, val, 0, private)
#define lll_futex_timed_wait(futexp, val, timespec, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
__ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
__lll_private_flag (FUTEX_WAIT, private), \
(val), (timespec)); \
__ret; \
})
#define lll_futex_wake(futexp, nr, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
__ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
__lll_private_flag (FUTEX_WAKE, private), \
(nr), 0); \
__ret; \
})
#define lll_private_futex_wait(futex, val) \
lll_private_futex_timed_wait (futex, val, NULL)
#ifdef __ASSUME_PRIVATE_FUTEX
# define lll_private_futex_timed_wait(futexp, val, timespec) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
__ret = INTERNAL_SYSCALL (futex, __err, 4, \
(futexp), FUTEX_WAIT | FUTEX_PRIVATE_FLAG, \
(val), (timespec)); \
__ret; \
})
#else
# define lll_private_futex_timed_wait(futexp, val, timespec) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret, __op; \
__op = FUTEX_WAIT | THREAD_GETMEM (THREAD_SELF, header.private_futex); \
__ret = INTERNAL_SYSCALL (futex, __err, 4, \
(futexp), __op, (val), (timespec)); \
__ret; \
})
#endif
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
__ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
__lll_private_flag (FUTEX_CMP_REQUEUE, private),\
(nr_wake), (nr_move), (mutex), (val)); \
__ret; \
})
/* Returns non-zero if error happened, zero if success. */
#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
__ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
__lll_private_flag (FUTEX_WAKE_OP, private), \
(nr_wake), (nr_wake2), (futexp2), \
FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
__ret; \
})
/* Priority Inheritance support. */
#define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \
lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private)
#define lll_futex_timed_wait_requeue_pi(futexp, val, timespec, clockbit, \
mutex, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
int __op = FUTEX_WAIT_REQUEUE_PI | clockbit; \
\
__ret = INTERNAL_SYSCALL (futex, __err, 5, (futexp), \
__lll_private_flag (__op, private), \
(val), (timespec), mutex); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
})
#define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, val, priv) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
\
__ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
__lll_private_flag (FUTEX_CMP_REQUEUE_PI, priv),\
(nr_wake), (nr_move), (mutex), (val)); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
})
static inline int
__attribute__ ((always_inline))
__lll_cond_trylock (int *futex)
{
return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
}
#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex))
static inline int
__attribute__ ((always_inline))
__lll_trylock (int *futex)
{
return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
}
#define lll_trylock(futex) __lll_trylock (&(futex))
extern void __lll_lock_wait (lll_lock_t *futex, int private) attribute_hidden;
extern void __lll_lock_wait_private (lll_lock_t *futex) attribute_hidden;
static inline void __attribute__((always_inline))
__lll_mutex_lock(lll_lock_t *futex, int private)
{
int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
if (__builtin_expect (val != 0, 0))
{
if (__builtin_constant_p (private) && private == LLL_PRIVATE)
__lll_lock_wait_private (futex);
else
__lll_lock_wait (futex, private);
}
}
#define lll_mutex_lock(futex, private) __lll_mutex_lock (&(futex), private)
#define lll_lock(lock, private) lll_mutex_lock (lock, private)
extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden;
static inline int
__attribute__ ((always_inline))
__lll_robust_lock (int *futex, int id, int private)
{
int result = 0;
if (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)
#define lll_robust_cond_lock(futex, id, private) \
__lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private)
static inline void
__attribute__ ((always_inline))
__lll_cond_lock (int *futex, int private)
{
int val = atomic_compare_and_exchange_val_acq (futex, 2, 0);
if (__builtin_expect (val != 0, 0))
__lll_lock_wait (futex, private);
}
#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)
extern int __lll_timedlock_wait (lll_lock_t *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 val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
int result = 0;
if (__builtin_expect (val != 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 (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 val = atomic_exchange_rel (futex, 0); \
if (__builtin_expect (val > 1, 0)) \
lll_futex_wake (futex, 1, private); \
})
#define lll_unlock(futex, private) __lll_unlock(&(futex), private)
#define __lll_robust_unlock(futex,private) \
(void) \
({ int val = atomic_exchange_rel (futex, 0); \
if (__builtin_expect (val & FUTEX_WAITERS, 0)) \
lll_futex_wake (futex, 1, private); \
})
#define lll_robust_unlock(futex, private) \
__lll_robust_unlock(&(futex), private)
#define lll_islocked(futex) \
(futex != 0)
/* Our internal lock implementation is identical to the binary-compatible
mutex implementation. */
#define LLL_LOCK_INITIALIZER (0)
#define LLL_LOCK_INITIALIZER_CONST (0)
#define LLL_LOCK_INITIALIZER_LOCKED (1)
#define THREAD_INIT_LOCK(PD, LOCK) \
(PD)->LOCK = LLL_LOCK_INITIALIZER
/* The kernel notifies a process which uses CLONE_CHILD_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, LLL_SHARED); \
} \
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; \
})
#endif /* lowlevellock.h */
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