/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Mackerras , 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 #include #include #include #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 /* 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; \ }) #define lll_robust_mutex_dead(futexv) \ do \ { \ INTERNAL_SYSCALL_DECL (__err); \ int *__futexp = &(futexv); \ \ atomic_or (__futexp, FUTEX_OWNER_DIED); \ INTERNAL_SYSCALL (futex, __err, 4, __futexp, FUTEX_WAKE, 1, 0); \ } \ while (0) /* 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); \ }) /* Returns non-zero if error happened, zero if success. */ #define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) \ ({ \ INTERNAL_SYSCALL_DECL (__err); \ long int __ret; \ \ __ret = INTERNAL_SYSCALL (futex, __err, 6, \ (futexp), FUTEX_WAKE_OP, (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\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_mutex_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_mutex_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_mutex_cond_trylock(lock) __lll_cond_trylock (&(lock)) extern void __lll_lock_wait (int *futex) attribute_hidden; extern int __lll_robust_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_robust_mutex_lock(lock, id) \ ({ \ 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); \ __val; \ }) #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); \ }) #define lll_robust_mutex_cond_lock(lock, id) \ ({ \ 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); \ __val; \ }) extern int __lll_timedlock_wait (int *futex, const struct timespec *) attribute_hidden; extern int __lll_robust_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_robust_mutex_timedlock(lock, abstime, id) \ ({ \ 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); \ __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_robust_mutex_unlock(lock) \ ((void) ({ \ int *__futex = &(lock); \ int __val = atomic_exchange_rel (__futex, 0); \ if (__builtin_expect (__val & FUTEX_WAITERS, 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 */