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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 | 314 |
1 files changed, 314 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..66c02cbbd --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h @@ -0,0 +1,314 @@ +/* Copyright (C) 2003, 2004, 2006-2008, 2009 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> +#include <kernel-features.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 +#define FUTEX_WAKE_OP 5 +#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1) +#define FUTEX_LOCK_PI 6 +#define FUTEX_UNLOCK_PI 7 +#define FUTEX_TRYLOCK_PI 8 +#define FUTEX_WAIT_BITSET 9 +#define FUTEX_WAKE_BITSET 10 +#define FUTEX_PRIVATE_FLAG 128 +#define FUTEX_CLOCK_REALTIME 256 + +#define FUTEX_BITSET_MATCH_ANY 0xffffffff + +/* Values for 'private' parameter of locking macros. Yes, the + definition seems to be backwards. But it is not. The bit will be + reversed before passing to the system call. */ +#define LLL_PRIVATE 0 +#define LLL_SHARED FUTEX_PRIVATE_FLAG + +#if !defined NOT_IN_libc || defined IS_IN_rtld +/* In libc.so or ld.so all futexes are private. */ +# ifdef __ASSUME_PRIVATE_FUTEX +# define __lll_private_flag(fl, private) \ + ((fl) | FUTEX_PRIVATE_FLAG) +# else +# define __lll_private_flag(fl, private) \ + ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) +# endif +#else +# ifdef __ASSUME_PRIVATE_FUTEX +# define __lll_private_flag(fl, private) \ + (((fl) | FUTEX_PRIVATE_FLAG) ^ (private)) +# else +# define __lll_private_flag(fl, private) \ + (__builtin_constant_p (private) \ + ? ((private) == 0 \ + ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \ + : (fl)) \ + : ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG) \ + & THREAD_GETMEM (THREAD_SELF, header.private_futex)))) +# endif +#endif + +#define lll_futex_wait(futexp, val, private) \ + lll_futex_timed_wait (futexp, val, NULL, private) + +#define lll_futex_timed_wait(futexp, val, timespec, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \ + __lll_private_flag (FUTEX_WAIT, private), \ + (val), (timespec)); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ + }) + +#define lll_futex_wake(futexp, nr, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \ + __lll_private_flag (FUTEX_WAKE, private), \ + (nr), 0); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ + }) + +#define lll_robust_dead(futexv, private) \ + do \ + { \ + INTERNAL_SYSCALL_DECL (__err); \ + int *__futexp = &(futexv); \ + \ + atomic_or (__futexp, FUTEX_OWNER_DIED); \ + INTERNAL_SYSCALL (futex, __err, 4, __futexp, \ + __lll_private_flag (FUTEX_WAKE, private), 1, 0); \ + } \ + while (0) + +/* Returns non-zero if error happened, zero if success. */ +#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ + __lll_private_flag (FUTEX_CMP_REQUEUE, private),\ + (nr_wake), (nr_move), (mutex), (val)); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err); \ + }) + +/* Returns non-zero if error happened, zero if success. */ +#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ + __lll_private_flag (FUTEX_WAKE_OP, private), \ + (nr_wake), (nr_wake2), (futexp2), \ + FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err); \ + }) + + +#ifdef UP +# define __lll_acq_instr "" +# define __lll_rel_instr "" +#else +# define __lll_acq_instr "isync" +# ifdef _ARCH_PWR4 +/* + * Newer powerpc64 processors support the new "light weight" sync (lwsync) + * So if the build is using -mcpu=[power4,power5,power5+,970] we can + * safely use lwsync. + */ +# define __lll_rel_instr "lwsync" +# else +/* + * Older powerpc32 processors don't support the new "light weight" + * sync (lwsync). So the only safe option is to use normal sync + * for all powerpc32 applications. + */ +# define __lll_rel_instr "sync" +# endif +#endif + +/* Set *futex to ID if it is 0, atomically. Returns the old value */ +#define __lll_robust_trylock(futex, id) \ + ({ int __val; \ + __asm __volatile ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\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" (id), "m" (*futex) \ + : "cr0", "memory"); \ + __val; \ + }) + +#define lll_robust_trylock(lock, id) __lll_robust_trylock (&(lock), id) + +/* Set *futex to 1 if it is 0, atomically. Returns the old value */ +#define __lll_trylock(futex) __lll_robust_trylock (futex, 1) + +#define lll_trylock(lock) __lll_trylock (&(lock)) + +/* Set *futex to 2 if it is 0, atomically. Returns the old value */ +#define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2) + +#define lll_cond_trylock(lock) __lll_cond_trylock (&(lock)) + + +extern void __lll_lock_wait_private (int *futex) attribute_hidden; +extern void __lll_lock_wait (int *futex, int private) attribute_hidden; +extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden; + +#define lll_lock(lock, private) \ + (void) ({ \ + int *__futex = &(lock); \ + if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\ + 0) != 0) \ + { \ + if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ + __lll_lock_wait_private (__futex); \ + else \ + __lll_lock_wait (__futex, private); \ + } \ + }) + +#define lll_robust_lock(lock, id, private) \ + ({ \ + int *__futex = &(lock); \ + int __val = 0; \ + if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \ + 0), 0)) \ + __val = __lll_robust_lock_wait (__futex, private); \ + __val; \ + }) + +#define lll_cond_lock(lock, private) \ + (void) ({ \ + int *__futex = &(lock); \ + if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\ + 0) != 0) \ + __lll_lock_wait (__futex, private); \ + }) + +#define lll_robust_cond_lock(lock, id, private) \ + ({ \ + int *__futex = &(lock); \ + int __val = 0; \ + int __id = id | FUTEX_WAITERS; \ + if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, __id,\ + 0), 0)) \ + __val = __lll_robust_lock_wait (__futex, private); \ + __val; \ + }) + + +extern int __lll_timedlock_wait + (int *futex, const struct timespec *, int private) attribute_hidden; +extern int __lll_robust_timedlock_wait + (int *futex, const struct timespec *, int private) attribute_hidden; + +#define lll_timedlock(lock, abstime, private) \ + ({ \ + 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, private); \ + __val; \ + }) + +#define lll_robust_timedlock(lock, abstime, id, private) \ + ({ \ + int *__futex = &(lock); \ + int __val = 0; \ + if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \ + 0), 0)) \ + __val = __lll_robust_timedlock_wait (__futex, abstime, private); \ + __val; \ + }) + +#define lll_unlock(lock, private) \ + ((void) ({ \ + int *__futex = &(lock); \ + int __val = atomic_exchange_rel (__futex, 0); \ + if (__builtin_expect (__val > 1, 0)) \ + lll_futex_wake (__futex, 1, private); \ + })) + +#define lll_robust_unlock(lock, private) \ + ((void) ({ \ + int *__futex = &(lock); \ + int __val = atomic_exchange_rel (__futex, 0); \ + if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \ + lll_futex_wake (__futex, 1, private); \ + })) + +#define lll_islocked(futex) \ + (futex != 0) + + +/* Initializers for lock. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) + +/* The states of a lock are: + 0 - untaken + 1 - taken by one user + >1 - taken by more users */ + +/* 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, LLL_SHARED); \ + } 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; \ + }) + +#endif /* lowlevellock.h */ |