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Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h new file mode 100644 index 0000000000..e8c3ebeedf --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h @@ -0,0 +1,222 @@ +/* Copyright (C) 2003 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 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> + + +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 + +/* 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); \ + __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)); \ + __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); \ + __ret; \ + }) + +#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 5, \ + (futexp), FUTEX_REQUEUE, (nr_wake), (nr_move), \ + (mutex)); \ + __ret; \ + }) + +#ifdef __sparc32_atomic_do_lock +#error SPARC < v9 does not support compare and swap which is essential for futex based locking +#endif + +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(futex) __lll_mutex_trylock (&(futex)) + + +extern void __lll_lock_wait (int *futex, int val) attribute_hidden; + + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_lock (int *futex) +{ + int val = atomic_exchange_and_add (futex, 1); + + if (__builtin_expect (val != 0, 0)) + __lll_lock_wait (futex, val); +} +#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex)) + + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_cond_lock (int *futex) +{ + int val = atomic_exchange_and_add (futex, 2); + + if (__builtin_expect (val != 0, 0)) + /* Note, the val + 1 is kind of ugly here. __lll_lock_wait will add + 1 again. But we added 2 to the futex value so this is the right + value which will be passed to the kernel. */ + __lll_lock_wait (futex, val + 1); +} +#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex)) + + +extern int __lll_timedlock_wait (int *futex, int val, const struct timespec *) + attribute_hidden; + + +static inline int +__attribute__ ((always_inline)) +__lll_mutex_timedlock (int *futex, const struct timespec *abstime) +{ + int val = atomic_exchange_and_add (futex, 1); + int result = 0; + + if (__builtin_expect (val != 0, 0)) + result = __lll_timedlock_wait (futex, val, abstime); + + return result; +} +#define lll_mutex_timedlock(futex, abstime) \ + __lll_mutex_timedlock (&(futex), abstime) + +#define lll_mutex_unlock(lock) \ + ((void) ({ \ + int *__futex = &(lock); \ + int __val = atomic_exchange_rel (__futex, 0); \ + if (__builtin_expect (__val > 1, 0)) \ + lll_futex_wake (__futex, 1); \ + })) + +#define lll_mutex_unlock_force(lock) \ + ((void) ({ \ + int *__futex = &(lock); \ + (void) atomic_exchange_rel (__futex, 0); \ + lll_futex_wake (__futex, 1); \ + })) + +#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 */ |