294 lines
8.9 KiB
C
294 lines
8.9 KiB
C
/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Libr \ary; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LOWLEVELLOCK_H
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#define _LOWLEVELLOCK_H 1
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#include <time.h>
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#include <sys/param.h>
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#include <bits/pthreadtypes.h>
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#include <atomic.h>
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#include <sysdep.h>
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#define __NR_futex 394
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_REQUEUE 3
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
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/* Initializer for compatibility lock. */
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#define LLL_MUTEX_LOCK_INITIALIZER (0)
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#define lll_futex_wait(futexp, val) \
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({ \
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INTERNAL_SYSCALL_DECL (__err); \
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long int __ret; \
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__ret = INTERNAL_SYSCALL (futex, __err, 4, \
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(futexp), FUTEX_WAIT, (val), 0); \
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INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
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})
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#define lll_futex_timed_wait(futexp, val, timespec) \
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({ \
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INTERNAL_SYSCALL_DECL (__err); \
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long int __ret; \
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__ret = INTERNAL_SYSCALL (futex, __err, 4, \
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(futexp), FUTEX_WAIT, (val), (timespec)); \
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INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
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})
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#define lll_futex_wake(futexp, nr) \
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({ \
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INTERNAL_SYSCALL_DECL (__err); \
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long int __ret; \
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__ret = INTERNAL_SYSCALL (futex, __err, 4, \
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(futexp), FUTEX_WAKE, (nr), 0); \
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INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
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})
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#define lll_robust_mutex_dead(futexv) \
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do \
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{ \
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int *__futexp = &(futexv); \
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atomic_or (__futexp, FUTEX_OWNER_DIED); \
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lll_futex_wake (__futexp, 1); \
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} \
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while (0)
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/* Returns non-zero if error happened, zero if success. */
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#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
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({ \
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INTERNAL_SYSCALL_DECL (__err); \
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long int __ret; \
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__ret = INTERNAL_SYSCALL (futex, __err, 6, \
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(futexp), FUTEX_CMP_REQUEUE, (nr_wake), \
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(nr_move), (mutex), (val)); \
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INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
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})
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/* Returns non-zero if error happened, zero if success. */
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#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) \
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({ \
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INTERNAL_SYSCALL_DECL (__err); \
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long int __ret; \
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__ret = INTERNAL_SYSCALL (futex, __err, 6, \
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(futexp), FUTEX_WAKE_OP, (nr_wake), \
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(nr_wake2), (futexp2), \
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FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
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INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
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})
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static inline int __attribute__((always_inline))
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__lll_mutex_trylock(int *futex)
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{
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return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
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}
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#define lll_mutex_trylock(lock) __lll_mutex_trylock (&(lock))
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static inline int __attribute__((always_inline))
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__lll_mutex_cond_trylock(int *futex)
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{
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return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
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}
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#define lll_mutex_cond_trylock(lock) __lll_mutex_cond_trylock (&(lock))
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static inline int __attribute__((always_inline))
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__lll_robust_mutex_trylock(int *futex, int id)
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{
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return atomic_compare_and_exchange_val_acq (futex, id, 0) != 0;
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}
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#define lll_robust_mutex_trylock(lock, id) \
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__lll_robust_mutex_trylock (&(lock), id)
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extern void __lll_lock_wait (int *futex) attribute_hidden;
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extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
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static inline void __attribute__((always_inline))
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__lll_mutex_lock(int *futex)
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{
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if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
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__lll_lock_wait (futex);
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}
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#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
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static inline int __attribute__ ((always_inline))
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__lll_robust_mutex_lock (int *futex, int id)
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{
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int result = 0;
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if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
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result = __lll_robust_lock_wait (futex);
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return result;
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}
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#define lll_robust_mutex_lock(futex, id) \
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__lll_robust_mutex_lock (&(futex), id)
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static inline void __attribute__ ((always_inline))
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__lll_mutex_cond_lock (int *futex)
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{
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if (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0)
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__lll_lock_wait (futex);
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}
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#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
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#define lll_robust_mutex_cond_lock(futex, id) \
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__lll_robust_mutex_lock (&(futex), (id) | FUTEX_WAITERS)
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extern int __lll_timedlock_wait (int *futex, const struct timespec *)
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attribute_hidden;
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extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *)
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attribute_hidden;
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static inline int __attribute__ ((always_inline))
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__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
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{
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int result = 0;
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if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
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result = __lll_timedlock_wait (futex, abstime);
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return result;
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}
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#define lll_mutex_timedlock(futex, abstime) \
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__lll_mutex_timedlock (&(futex), abstime)
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static inline int __attribute__ ((always_inline))
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__lll_robust_mutex_timedlock (int *futex, const struct timespec *abstime,
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int id)
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{
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int result = 0;
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if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
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result = __lll_robust_timedlock_wait (futex, abstime);
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return result;
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}
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#define lll_robust_mutex_timedlock(futex, abstime, id) \
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__lll_robust_mutex_timedlock (&(futex), abstime, id)
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static inline void __attribute__ ((always_inline))
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__lll_mutex_unlock (int *futex)
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{
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int val = atomic_exchange_rel (futex, 0);
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if (__builtin_expect (val > 1, 0))
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lll_futex_wake (futex, 1);
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}
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#define lll_mutex_unlock(futex) __lll_mutex_unlock(&(futex))
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static inline void __attribute__ ((always_inline))
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__lll_robust_mutex_unlock (int *futex, int mask)
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{
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int val = atomic_exchange_rel (futex, 0);
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if (__builtin_expect (val & mask, 0))
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lll_futex_wake (futex, 1);
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}
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#define lll_robust_mutex_unlock(futex) \
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__lll_robust_mutex_unlock(&(futex), FUTEX_WAITERS)
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static inline void __attribute__ ((always_inline))
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__lll_mutex_unlock_force (int *futex)
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{
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(void) atomic_exchange_rel (futex, 0);
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lll_futex_wake (futex, 1);
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}
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#define lll_mutex_unlock_force(futex) __lll_mutex_unlock_force(&(futex))
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#define lll_mutex_islocked(futex) \
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(futex != 0)
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/* Our internal lock implementation is identical to the binary-compatible
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mutex implementation. */
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/* Type for lock object. */
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typedef int lll_lock_t;
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/* Initializers for lock. */
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#define LLL_LOCK_INITIALIZER (0)
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#define LLL_LOCK_INITIALIZER_LOCKED (1)
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extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
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/* The states of a lock are:
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0 - untaken
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1 - taken by one user
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>1 - taken by more users */
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#define lll_trylock(lock) lll_mutex_trylock (lock)
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#define lll_lock(lock) lll_mutex_lock (lock)
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#define lll_unlock(lock) lll_mutex_unlock (lock)
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#define lll_islocked(lock) lll_mutex_islocked (lock)
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/* The kernel notifies a process which uses CLONE_CLEARTID via futex
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wakeup when the clone terminates. The memory location contains the
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thread ID while the clone is running and is reset to zero
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afterwards. */
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#define lll_wait_tid(tid) \
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do { \
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__typeof (tid) __tid; \
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while ((__tid = (tid)) != 0) \
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lll_futex_wait (&(tid), __tid); \
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} while (0)
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extern int __lll_timedwait_tid (int *, const struct timespec *)
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attribute_hidden;
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#define lll_timedwait_tid(tid, abstime) \
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({ \
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int __res = 0; \
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if ((tid) != 0) \
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__res = __lll_timedwait_tid (&(tid), (abstime)); \
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__res; \
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})
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/* Conditional variable handling. */
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extern void __lll_cond_wait (pthread_cond_t *cond)
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attribute_hidden;
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extern int __lll_cond_timedwait (pthread_cond_t *cond,
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const struct timespec *abstime)
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attribute_hidden;
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extern void __lll_cond_wake (pthread_cond_t *cond)
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attribute_hidden;
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extern void __lll_cond_broadcast (pthread_cond_t *cond)
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attribute_hidden;
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#define lll_cond_wait(cond) \
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__lll_cond_wait (cond)
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#define lll_cond_timedwait(cond, abstime) \
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__lll_cond_timedwait (cond, abstime)
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#define lll_cond_wake(cond) \
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__lll_cond_wake (cond)
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#define lll_cond_broadcast(cond) \
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__lll_cond_broadcast (cond)
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#endif /* lowlevellock.h */
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