mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 19:51:11 +00:00
d5ba53f907
__ASSUME_FUTEX_LOCK_PI. * include/time.h: Declare __nanosleep_nocancel. * include/unistd.h: Declare __pause_nocancel.
297 lines
8.9 KiB
C
297 lines
8.9 KiB
C
/* Copyright (C) 2003, 2004, 2006 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 Libr \ary; 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 <sysdep.h>
|
|
|
|
|
|
#define __NR_futex 394
|
|
#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
|
|
|
|
/* Initializer for compatibility lock. */
|
|
#define LLL_MUTEX_LOCK_INITIALIZER (0)
|
|
|
|
#define lll_futex_wait(futexp, val) \
|
|
({ \
|
|
INTERNAL_SYSCALL_DECL (__err); \
|
|
long int __ret; \
|
|
__ret = INTERNAL_SYSCALL (futex, __err, 4, \
|
|
(futexp), FUTEX_WAIT, (val), 0); \
|
|
INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
|
|
})
|
|
|
|
#define lll_futex_timed_wait(futexp, val, timespec) \
|
|
({ \
|
|
INTERNAL_SYSCALL_DECL (__err); \
|
|
long int __ret; \
|
|
__ret = INTERNAL_SYSCALL (futex, __err, 4, \
|
|
(futexp), FUTEX_WAIT, (val), (timespec)); \
|
|
INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
|
|
})
|
|
|
|
#define lll_futex_wake(futexp, nr) \
|
|
({ \
|
|
INTERNAL_SYSCALL_DECL (__err); \
|
|
long int __ret; \
|
|
__ret = INTERNAL_SYSCALL (futex, __err, 4, \
|
|
(futexp), FUTEX_WAKE, (nr), 0); \
|
|
INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
|
|
})
|
|
|
|
#define lll_robust_mutex_dead(futexv) \
|
|
do \
|
|
{ \
|
|
int *__futexp = &(futexv); \
|
|
atomic_or (__futexp, FUTEX_OWNER_DIED); \
|
|
lll_futex_wake (__futexp, 1); \
|
|
} \
|
|
while (0)
|
|
|
|
/* Returns non-zero if error happened, zero if success. */
|
|
#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
|
|
({ \
|
|
INTERNAL_SYSCALL_DECL (__err); \
|
|
long int __ret; \
|
|
__ret = INTERNAL_SYSCALL (futex, __err, 6, \
|
|
(futexp), FUTEX_CMP_REQUEUE, (nr_wake), \
|
|
(nr_move), (mutex), (val)); \
|
|
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
|
|
})
|
|
|
|
/* Returns non-zero if error happened, zero if success. */
|
|
#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) \
|
|
({ \
|
|
INTERNAL_SYSCALL_DECL (__err); \
|
|
long int __ret; \
|
|
__ret = INTERNAL_SYSCALL (futex, __err, 6, \
|
|
(futexp), FUTEX_WAKE_OP, (nr_wake), \
|
|
(nr_wake2), (futexp2), \
|
|
FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
|
|
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
|
|
})
|
|
|
|
|
|
|
|
|
|
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(lock) __lll_mutex_trylock (&(lock))
|
|
|
|
|
|
static inline int __attribute__((always_inline))
|
|
__lll_mutex_cond_trylock(int *futex)
|
|
{
|
|
return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
|
|
}
|
|
#define lll_mutex_cond_trylock(lock) __lll_mutex_cond_trylock (&(lock))
|
|
|
|
|
|
static inline int __attribute__((always_inline))
|
|
__lll_robust_mutex_trylock(int *futex, int id)
|
|
{
|
|
return atomic_compare_and_exchange_val_acq (futex, id, 0) != 0;
|
|
}
|
|
#define lll_robust_mutex_trylock(lock, id) \
|
|
__lll_robust_mutex_trylock (&(lock), id)
|
|
|
|
extern void __lll_lock_wait (int *futex) attribute_hidden;
|
|
extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
|
|
|
|
static inline void __attribute__((always_inline))
|
|
__lll_mutex_lock(int *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))
|
|
|
|
|
|
static inline int __attribute__ ((always_inline))
|
|
__lll_robust_mutex_lock (int *futex, int id)
|
|
{
|
|
int result = 0;
|
|
if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
|
|
result = __lll_robust_lock_wait (futex);
|
|
return result;
|
|
}
|
|
#define lll_robust_mutex_lock(futex, id) \
|
|
__lll_robust_mutex_lock (&(futex), id)
|
|
|
|
|
|
static inline void __attribute__ ((always_inline))
|
|
__lll_mutex_cond_lock (int *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) \
|
|
__lll_robust_mutex_lock (&(futex), (id) | FUTEX_WAITERS)
|
|
|
|
|
|
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;
|
|
|
|
static inline int __attribute__ ((always_inline))
|
|
__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
|
|
{
|
|
int result = 0;
|
|
if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
|
|
result = __lll_timedlock_wait (futex, abstime);
|
|
return result;
|
|
}
|
|
#define lll_mutex_timedlock(futex, abstime) \
|
|
__lll_mutex_timedlock (&(futex), abstime)
|
|
|
|
|
|
static inline int __attribute__ ((always_inline))
|
|
__lll_robust_mutex_timedlock (int *futex, const struct timespec *abstime,
|
|
int id)
|
|
{
|
|
int result = 0;
|
|
if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
|
|
result = __lll_robust_timedlock_wait (futex, abstime);
|
|
return result;
|
|
}
|
|
#define lll_robust_mutex_timedlock(futex, abstime, id) \
|
|
__lll_robust_mutex_timedlock (&(futex), abstime, id)
|
|
|
|
|
|
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_robust_mutex_unlock (int *futex, int mask)
|
|
{
|
|
int val = atomic_exchange_rel (futex, 0);
|
|
if (__builtin_expect (val & mask, 0))
|
|
lll_futex_wake (futex, 1);
|
|
}
|
|
#define lll_robust_mutex_unlock(futex) \
|
|
__lll_robust_mutex_unlock(&(futex), FUTEX_WAITERS)
|
|
|
|
|
|
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)
|
|
|
|
|
|
/* Our internal lock implementation is identical to the binary-compatible
|
|
mutex implementation. */
|
|
|
|
/* Type for lock object. */
|
|
typedef int lll_lock_t;
|
|
|
|
/* Initializers for lock. */
|
|
#define LLL_LOCK_INITIALIZER (0)
|
|
#define LLL_LOCK_INITIALIZER_LOCKED (1)
|
|
|
|
extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
|
|
|
|
/* The states of a lock are:
|
|
0 - untaken
|
|
1 - taken by one user
|
|
>1 - taken by more users */
|
|
|
|
#define lll_trylock(lock) lll_mutex_trylock (lock)
|
|
#define lll_lock(lock) lll_mutex_lock (lock)
|
|
#define lll_unlock(lock) lll_mutex_unlock (lock)
|
|
#define lll_islocked(lock) lll_mutex_islocked (lock)
|
|
|
|
/* The kernel notifies a process which 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 */
|