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Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h new file mode 100644 index 000000000..1f2f481d6 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h @@ -0,0 +1,241 @@ +/* Copyright (C) 2003, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Paul Mackerras <paulus@au.ibm.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 <atomic.h> + + +#ifndef __NR_futex +# define __NR_futex 221 +#endif +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 +#define FUTEX_CMP_REQUEUE 4 + +/* 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); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __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)); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __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); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ + }) + +/* Returns non-zero if error happened, zero if success. */ +#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 6, \ + (futexp), FUTEX_CMP_REQUEUE, (nr_wake), \ + (nr_move), (mutex), (val)); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err); \ + }) + +#ifdef UP +# define __lll_acq_instr "" +# define __lll_rel_instr "" +#else +# define __lll_acq_instr "isync" +# define __lll_rel_instr "sync" +#endif + +/* Set *futex to 1 if it is 0, atomically. Returns the old value */ +#define __lll_trylock(futex) \ + ({ int __val; \ + __asm __volatile ("1: lwarx %0,0,%2\n" \ + " cmpwi 0,%0,0\n" \ + " bne 2f\n" \ + " stwcx. %3,0,%2\n" \ + " bne- 1b\n" \ + "2: " __lll_acq_instr \ + : "=&r" (__val), "=m" (*futex) \ + : "r" (futex), "r" (1), "m" (*futex) \ + : "cr0", "memory"); \ + __val; \ + }) + +#define lll_mutex_trylock(lock) __lll_trylock (&(lock)) + +/* Set *futex to 2 if it is 0, atomically. Returns the old value */ +#define __lll_cond_trylock(futex) \ + ({ int __val; \ + __asm __volatile ("1: lwarx %0,0,%2\n" \ + " cmpwi 0,%0,0\n" \ + " bne 2f\n" \ + " stwcx. %3,0,%2\n" \ + " bne- 1b\n" \ + "2: " __lll_acq_instr \ + : "=&r" (__val), "=m" (*futex) \ + : "r" (futex), "r" (2), "m" (*futex) \ + : "cr0", "memory"); \ + __val; \ + }) +#define lll_mutex_cond_trylock(lock) __lll_cond_trylock (&(lock)) + + +extern void __lll_lock_wait (int *futex) attribute_hidden; + +#define lll_mutex_lock(lock) \ + (void) ({ \ + int *__futex = &(lock); \ + if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\ + 0) != 0) \ + __lll_lock_wait (__futex); \ + }) + +#define lll_mutex_cond_lock(lock) \ + (void) ({ \ + int *__futex = &(lock); \ + if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\ + 0) != 0) \ + __lll_lock_wait (__futex); \ + }) + +extern int __lll_timedlock_wait + (int *futex, const struct timespec *) attribute_hidden; + +#define lll_mutex_timedlock(lock, abstime) \ + ({ \ + int *__futex = &(lock); \ + int __val = 0; \ + if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\ + 0) != 0) \ + __val = __lll_timedlock_wait (__futex, abstime); \ + __val; \ + }) + +#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); \ + *__futex = 0; \ + __asm __volatile (__lll_rel_instr ::: "memory"); \ + lll_futex_wake (__futex, 1); \ + })) + +#define lll_mutex_islocked(futex) \ + (futex != 0) + + +/* Our internal lock implementation is identical to the binary-compatible + mutex implementation. */ + +/* Type for lock object. */ +typedef int lll_lock_t; + +/* Initializers for lock. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) + +extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; + +/* The states of a lock are: + 0 - untaken + 1 - taken by one user + >1 - taken by more users */ + +#define lll_trylock(lock) lll_mutex_trylock (lock) +#define lll_lock(lock) lll_mutex_lock (lock) +#define lll_unlock(lock) lll_mutex_unlock (lock) +#define lll_islocked(lock) lll_mutex_islocked (lock) + +/* The kernel notifies a process which 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 */ |