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Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h new file mode 100644 index 000000000..e13358ffe --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h @@ -0,0 +1,204 @@ +/* Copyright (C) 2003, 2004 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, 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 <ia64intrin.h> +#include <atomic.h> + +#define __NR_futex 1230 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 +#define FUTEX_CMP_REQUEUE 4 + +/* Delay in spinlock loop. */ +#define BUSY_WAIT_NOP asm ("hint @pause") + +/* Initializer for compatibility lock. */ +#define LLL_MUTEX_LOCK_INITIALIZER (0) + +#define lll_futex_wait(futex, val) lll_futex_timed_wait (futex, val, 0) + +#define lll_futex_timed_wait(ftx, val, timespec) \ +({ \ + DO_INLINE_SYSCALL(futex, 4, (long) (ftx), FUTEX_WAIT, (int) (val), \ + (long) (timespec)); \ + _r10 == -1 ? -_retval : _retval; \ +}) + +#define lll_futex_wake(ftx, nr) \ +({ \ + DO_INLINE_SYSCALL(futex, 3, (long) (ftx), FUTEX_WAKE, (int) (nr)); \ + _r10 == -1 ? -_retval : _retval; \ +}) + +/* Returns non-zero if error happened, zero if success. */ +#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val) \ +({ \ + DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_CMP_REQUEUE, \ + (int) (nr_wake), (int) (nr_move), (long) (mutex), \ + (int) val); \ + _r10 == -1; \ +}) + + +#define __lll_mutex_trylock(futex) \ + (atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0) +#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex)) + + +#define __lll_mutex_cond_trylock(futex) \ + (atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0) +#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex)) + + +extern void __lll_lock_wait (int *futex) attribute_hidden; + + +#define __lll_mutex_lock(futex) \ + ((void) ({ \ + int *__futex = (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)) + + +#define __lll_mutex_cond_lock(futex) \ + ((void) ({ \ + int *__futex = (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)) + + +extern int __lll_timedlock_wait (int *futex, const struct timespec *) + attribute_hidden; + + +#define __lll_mutex_timedlock(futex, abstime) \ + ({ \ + int *__futex = (futex); \ + int __val = 0; \ + \ + if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \ + __val = __lll_timedlock_wait (__futex, abstime); \ + __val; \ + }) +#define lll_mutex_timedlock(futex, abstime) \ + __lll_mutex_timedlock (&(futex), abstime) + + +#define __lll_mutex_unlock(futex) \ + ((void) ({ \ + int *__futex = (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)) + + +#define __lll_mutex_unlock_force(futex) \ + ((void) ({ \ + int *__futex = (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) + + +/* We have a separate internal lock implementation which is not tied + to binary compatibility. We can use the lll_mutex_*. */ + +/* Type for lock object. */ +typedef int lll_lock_t; + +extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; + +/* Initializers for lock. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) + +#define lll_trylock(futex) lll_mutex_trylock (futex) +#define lll_lock(futex) lll_mutex_lock (futex) +#define lll_unlock(futex) lll_mutex_unlock (futex) +#define lll_islocked(futex) lll_mutex_islocked (futex) + + +/* The kernel notifies a process with 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 */ |