2004-03-24 14:36:06 +08:00
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/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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2003-03-11 17:30:37 +08:00
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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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 Library; 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 <ia64intrin.h>
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2003-03-20 18:29:20 +08:00
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#include <atomic.h>
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2003-03-11 17:30:37 +08:00
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2003-12-11 07:02:33 +08:00
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#define __NR_futex 1230
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2003-03-11 17:30:37 +08:00
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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2003-05-26 10:47:39 +08:00
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#define FUTEX_REQUEUE 3
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2004-06-04 00:04:11 +08:00
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#define FUTEX_CMP_REQUEUE 4
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2003-03-11 17:30:37 +08:00
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2004-03-24 14:36:06 +08:00
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/* Delay in spinlock loop. */
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#define BUSY_WAIT_NOP asm ("hint @pause")
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2003-03-11 17:30:37 +08:00
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/* Initializer for compatibility lock. */
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#define LLL_MUTEX_LOCK_INITIALIZER (0)
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2003-03-14 05:51:07 +08:00
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#define lll_futex_wait(futex, val) lll_futex_timed_wait (futex, val, 0)
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2003-03-11 17:30:37 +08:00
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2003-12-11 07:02:33 +08:00
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#define lll_futex_timed_wait(ftx, val, timespec) \
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({ \
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DO_INLINE_SYSCALL(futex, 4, (long) (ftx), FUTEX_WAIT, (int) (val), \
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(long) (timespec)); \
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_r10 == -1 ? -_retval : _retval; \
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})
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#define lll_futex_wake(ftx, nr) \
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({ \
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DO_INLINE_SYSCALL(futex, 3, (long) (ftx), FUTEX_WAKE, (int) (nr)); \
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_r10 == -1 ? -_retval : _retval; \
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})
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2004-06-04 00:04:11 +08:00
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/* Returns non-zero if error happened, zero if success. */
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#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val) \
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2003-12-11 07:02:33 +08:00
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({ \
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2004-06-04 00:04:11 +08:00
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DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_CMP_REQUEUE, \
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(int) (nr_wake), (int) (nr_move), (long) (mutex), \
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(int) val); \
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_r10 == -1; \
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2003-12-11 07:02:33 +08:00
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})
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#define __lll_mutex_trylock(futex) \
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(atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0)
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#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
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2004-03-24 14:36:06 +08:00
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#define __lll_mutex_cond_trylock(futex) \
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(atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)
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#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
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2003-09-23 05:30:25 +08:00
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extern void __lll_lock_wait (int *futex) attribute_hidden;
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2003-12-11 07:02:33 +08:00
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#define __lll_mutex_lock(futex) \
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((void) ({ \
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int *__futex = (futex); \
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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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2003-12-11 07:02:33 +08:00
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#define __lll_mutex_cond_lock(futex) \
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((void) ({ \
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int *__futex = (futex); \
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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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2003-05-26 10:47:39 +08:00
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#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
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2003-09-23 05:30:25 +08:00
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extern int __lll_timedlock_wait (int *futex, const struct timespec *)
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2003-03-18 13:31:53 +08:00
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attribute_hidden;
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2003-03-11 17:30:37 +08:00
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2003-12-11 07:02:33 +08:00
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#define __lll_mutex_timedlock(futex, abstime) \
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({ \
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int *__futex = (futex); \
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int __val = 0; \
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\
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if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \
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__val = __lll_timedlock_wait (__futex, abstime); \
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__val; \
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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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2003-12-11 07:02:33 +08:00
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#define __lll_mutex_unlock(futex) \
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((void) ({ \
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int *__futex = (futex); \
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int __val = atomic_exchange_rel (__futex, 0); \
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\
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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) \
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__lll_mutex_unlock(&(futex))
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2003-05-30 11:47:32 +08:00
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2003-12-11 07:02:33 +08:00
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#define __lll_mutex_unlock_force(futex) \
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((void) ({ \
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int *__futex = (futex); \
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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) \
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__lll_mutex_unlock_force(&(futex))
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2003-03-11 17:30:37 +08:00
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#define lll_mutex_islocked(futex) \
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(futex != 0)
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/* We have a separate internal lock implementation which is not tied
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to binary compatibility. We can use the lll_mutex_*. */
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/* Type for lock object. */
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typedef int lll_lock_t;
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extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
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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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#define lll_trylock(futex) lll_mutex_trylock (futex)
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#define lll_lock(futex) lll_mutex_lock (futex)
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#define lll_unlock(futex) lll_mutex_unlock (futex)
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#define lll_islocked(futex) lll_mutex_islocked (futex)
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/* The kernel notifies a process with 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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{ \
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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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} \
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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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2003-03-18 13:31:53 +08:00
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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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2003-03-11 17:30:37 +08:00
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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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