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glibc/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
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/* Copyright (C) 2003-2015 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, 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 <atomic.h> | |
#include <kernel-features.h> | |
#include <lowlevellock-futex.h> | |
static inline int | |
__attribute__ ((always_inline)) | |
__lll_trylock (int *futex) | |
{ | |
return atomic_compare_and_exchange_val_24_acq (futex, 1, 0) != 0; | |
} | |
#define lll_trylock(futex) __lll_trylock (&(futex)) | |
static inline int | |
__attribute__ ((always_inline)) | |
__lll_cond_trylock (int *futex) | |
{ | |
return atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0; | |
} | |
#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex)) | |
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) | |
{ | |
int val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0); | |
if (__glibc_unlikely (val != 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 (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) | |
{ | |
int val = atomic_compare_and_exchange_val_24_acq (futex, 2, 0); | |
if (__glibc_unlikely (val != 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 val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0); | |
int result = 0; | |
if (__glibc_unlikely (val != 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(lock, private) \ | |
((void) ({ \ | |
int *__futex = &(lock); \ | |
int __val = atomic_exchange_24_rel (__futex, 0); \ | |
if (__glibc_unlikely (__val > 1)) \ | |
lll_futex_wake (__futex, 1, private); \ | |
})) | |
#define lll_robust_unlock(lock, private) \ | |
((void) ({ \ | |
int *__futex = &(lock); \ | |
int __val = atomic_exchange_rel (__futex, 0); \ | |
if (__glibc_unlikely (__val & FUTEX_WAITERS)) \ | |
lll_futex_wake (__futex, 1, 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 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 */ |