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Diffstat (limited to 'sysdeps/unix/sysv/linux/hppa/lowlevellock.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/hppa/lowlevellock.h | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/hppa/lowlevellock.h b/sysdeps/unix/sysv/linux/hppa/lowlevellock.h new file mode 100644 index 0000000000..fb61d0c6d0 --- /dev/null +++ b/sysdeps/unix/sysv/linux/hppa/lowlevellock.h @@ -0,0 +1,334 @@ +/* Copyright (C) 2003-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _LOWLEVELLOCK_H +#define _LOWLEVELLOCK_H 1 + +#include <time.h> +#include <sys/param.h> +#include <bits/pthreadtypes.h> +#include <sysdep.h> +#include <atomic.h> +#include <kernel-features.h> /* Need __ASSUME_PRIVATE_FUTEX. */ +#include <tls.h> /* Need THREAD_*, and header.*. */ + +/* HPPA only has one atomic read and modify memory operation, + load and clear, so hppa uses a kernel helper routine to implement + compare_and_exchange. See atomic.h for the userspace calling + sequence. */ + +#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_WAIT_REQUEUE_PI 11 +#define FUTEX_CMP_REQUEUE_PI 12 +#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 + +/* Initialize locks to zero. */ +#define LLL_MUTEX_LOCK_INITIALIZER (0) + +#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 + +/* Type for lock object. */ +typedef int lll_lock_t; + +#define lll_futex_wait(futexp, val, private) \ + lll_futex_timed_wait (futexp, val, 0, 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)); \ + __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); \ + __ret; \ + }) + +#define lll_private_futex_wait(futex, val) \ + lll_private_futex_timed_wait (futex, val, NULL) + +#ifdef __ASSUME_PRIVATE_FUTEX +# define lll_private_futex_timed_wait(futexp, val, timespec) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + __ret = INTERNAL_SYSCALL (futex, __err, 4, \ + (futexp), FUTEX_WAIT | FUTEX_PRIVATE_FLAG, \ + (val), (timespec)); \ + __ret; \ + }) +#else +# define lll_private_futex_timed_wait(futexp, val, timespec) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret, __op; \ + __op = FUTEX_WAIT | THREAD_GETMEM (THREAD_SELF, header.private_futex); \ + __ret = INTERNAL_SYSCALL (futex, __err, 4, \ + (futexp), __op, (val), (timespec)); \ + __ret; \ + }) +#endif + +/* 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)); \ + __ret; \ + }) + +/* 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); \ + __ret; \ + }) + +/* Priority Inheritance support. */ +#define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \ + lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private) + +#define lll_futex_timed_wait_requeue_pi(futexp, val, timespec, clockbit, \ + mutex, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + int __op = FUTEX_WAIT_REQUEUE_PI | clockbit; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 5, (futexp), \ + __lll_private_flag (__op, private), \ + (val), (timespec), mutex); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ + }) + +#define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, val, priv) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ + __lll_private_flag (FUTEX_CMP_REQUEUE_PI, priv),\ + (nr_wake), (nr_move), (mutex), (val)); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err); \ + }) + +static inline int +__attribute__ ((always_inline)) +__lll_cond_trylock (int *futex) +{ + return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0; +} +#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex)) + +static inline int +__attribute__ ((always_inline)) +__lll_trylock (int *futex) +{ + return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0; +} +#define lll_trylock(futex) __lll_trylock (&(futex)) + +extern void __lll_lock_wait (lll_lock_t *futex, int private) attribute_hidden; +extern void __lll_lock_wait_private (lll_lock_t *futex) attribute_hidden; + +static inline void __attribute__((always_inline)) +__lll_mutex_lock(lll_lock_t *futex, int private) +{ + int val = atomic_compare_and_exchange_val_acq (futex, 1, 0); + + if (__builtin_expect (val != 0, 0)) + { + if (__builtin_constant_p (private) && private == LLL_PRIVATE) + __lll_lock_wait_private (futex); + else + __lll_lock_wait (futex, private); + } +} +#define lll_mutex_lock(futex, private) __lll_mutex_lock (&(futex), private) +#define lll_lock(lock, private) lll_mutex_lock (lock, private) + +extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden; + +static inline int +__attribute__ ((always_inline)) +__lll_robust_lock (int *futex, int id, int private) +{ + int result = 0; + if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0) + result = __lll_robust_lock_wait (futex, private); + return result; +} +#define lll_robust_lock(futex, id, private) \ + __lll_robust_lock (&(futex), id, private) + +#define lll_robust_cond_lock(futex, id, private) \ + __lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private) + +static inline void +__attribute__ ((always_inline)) +__lll_cond_lock (int *futex, int private) +{ + int val = atomic_compare_and_exchange_val_acq (futex, 2, 0); + + if (__builtin_expect (val != 0, 0)) + __lll_lock_wait (futex, private); +} +#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private) + +extern int __lll_timedlock_wait (lll_lock_t *futex, const struct timespec *, + int private) attribute_hidden; +extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *, + int private) attribute_hidden; + +static inline int +__attribute__ ((always_inline)) +__lll_timedlock (int *futex, const struct timespec *abstime, int private) +{ + int val = atomic_compare_and_exchange_val_acq (futex, 1, 0); + int result = 0; + + if (__builtin_expect (val != 0, 0)) + result = __lll_timedlock_wait (futex, abstime, private); + return result; +} +#define lll_timedlock(futex, abstime, private) \ + __lll_timedlock (&(futex), abstime, private) + +static inline int __attribute__ ((always_inline)) +__lll_robust_timedlock (int *futex, const struct timespec *abstime, + int id, int private) +{ + int result = 0; + if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0) + result = __lll_robust_timedlock_wait (futex, abstime, private); + return result; +} +#define lll_robust_timedlock(futex, abstime, id, private) \ + __lll_robust_timedlock (&(futex), abstime, id, private) + +#define __lll_unlock(futex, private) \ + (void) \ + ({ int val = atomic_exchange_rel (futex, 0); \ + if (__builtin_expect (val > 1, 0)) \ + lll_futex_wake (futex, 1, private); \ + }) +#define lll_unlock(futex, private) __lll_unlock(&(futex), private) + +#define __lll_robust_unlock(futex,private) \ + (void) \ + ({ int val = atomic_exchange_rel (futex, 0); \ + if (__builtin_expect (val & FUTEX_WAITERS, 0)) \ + lll_futex_wake (futex, 1, private); \ + }) +#define lll_robust_unlock(futex, private) \ + __lll_robust_unlock(&(futex), private) + +#define lll_islocked(futex) \ + (futex != 0) + +/* Our internal lock implementation is identical to the binary-compatible + mutex implementation. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_CONST (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) + +#define THREAD_INIT_LOCK(PD, LOCK) \ + (PD)->LOCK = LLL_LOCK_INITIALIZER + +/* The kernel notifies a process which uses CLONE_CHILD_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 */ |