/* Copyright (C) 2003, 2004 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, 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 #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 /* Initializer for compatibility lock. */ #define LLL_MUTEX_LOCK_INITIALIZER (0) #define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1) #define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2) extern int __lll_mutex_lock_wait (int val, int *__futex) attribute_hidden; extern int __lll_mutex_timedlock_wait (int val, int *__futex, const struct timespec *abstime) attribute_hidden; extern int __lll_mutex_unlock_wake (int *__futex) attribute_hidden; #define lll_mutex_trylock(futex) \ ({ unsigned char __result; \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%1,r2\n\ cmp/eq r2,%3\n\ bf 1f\n\ mov.l %2,@%1\n\ 1: mov r1,r15\n\ mov #-1,%0\n\ negc %0,%0"\ : "=r" (__result) \ : "r" (&(futex)), \ "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), \ "r" (LLL_MUTEX_LOCK_INITIALIZER) \ : "r0", "r1", "r2", "t", "memory"); \ __result; }) #define lll_mutex_cond_trylock(futex) \ ({ unsigned char __result; \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%1,r2\n\ cmp/eq r2,%3\n\ bf 1f\n\ mov.l %2,@%1\n\ 1: mov r1,r15\n\ mov #-1,%0\n\ negc %0,%0"\ : "=r" (__result) \ : "r" (&(futex)), \ "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \ "r" (LLL_MUTEX_LOCK_INITIALIZER) \ : "r0", "r1", "r2", "t", "memory"); \ __result; }) #define lll_mutex_lock(futex) \ (void) ({ int __result, *__futex = &(futex); \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%2,%0\n\ tst %0,%0\n\ bf 1f\n\ mov.l %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (1), "r" (__futex) \ : "r0", "r1", "t", "memory"); \ if (__result) \ __lll_mutex_lock_wait (__result, __futex); }) /* Special version of lll_mutex_lock which causes the unlock function to always wakeup waiters. */ #define lll_mutex_cond_lock(futex) \ (void) ({ int __result, *__futex = &(futex); \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%2,%0\n\ tst %0,%0\n\ bf 1f\n\ mov.l %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (2), "r" (__futex) \ : "r0", "r1", "t", "memory"); \ if (__result) \ __lll_mutex_lock_wait (__result, __futex); }) #define lll_mutex_timedlock(futex, timeout) \ ({ int __result, *__futex = &(futex); \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ nop\n\ mov r15,r1\n\ mov #-8,r15\n\ 0: mov.l @%2,%0\n\ tst %0,%0\n\ bf 1f\n\ mov.l %1,@%2\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (1), "r" (__futex) \ : "r0", "r1", "t", "memory"); \ if (__result) \ __result = __lll_mutex_timedlock_wait (__result, __futex, timeout); \ __result; }) #define lll_mutex_unlock(futex) \ (void) ({ int __result, *__futex = &(futex); \ __asm __volatile ("\ .align 2\n\ mova 1f,r0\n\ mov r15,r1\n\ mov #-6,r15\n\ 0: mov.l @%1,%0\n\ add #-1,%0\n\ mov.l %0,@%1\n\ 1: mov r1,r15"\ : "=&r" (__result) : "r" (__futex) \ : "r0", "r1", "memory"); \ if (__result) \ __lll_mutex_unlock_wake (__futex); }) #define lll_mutex_islocked(futex) \ (futex != 0) /* We have a separate internal lock implementation which is not tied to binary compatibility. */ /* Type for lock object. */ typedef int lll_lock_t; /* Initializers for lock. */ #define LLL_LOCK_INITIALIZER (0) #define LLL_LOCK_INITIALIZER_LOCKED (1) # ifdef NEED_SYSCALL_INST_PAD # define SYSCALL_WITH_INST_PAD "\ trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" # else # define SYSCALL_WITH_INST_PAD "\ trapa #0x14" # endif #define lll_futex_wait(futex, val) \ do { \ int __ignore; \ register unsigned long __r3 __asm ("r3") = SYS_futex; \ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \ register unsigned long __r5 __asm ("r5") = FUTEX_WAIT; \ register unsigned long __r6 __asm ("r6") = (unsigned long) (val); \ register unsigned long __r7 __asm ("r7") = 0; \ __asm __volatile (SYSCALL_WITH_INST_PAD \ : "=z" (__ignore) \ : "r" (__r3), "r" (__r4), "r" (__r5), \ "r" (__r6), "r" (__r7) \ : "memory", "t"); \ } while (0) #define lll_futex_timed_wait(futex, val, timeout) \ ({ \ int __status; \ register unsigned long __r3 __asm ("r3") = SYS_futex; \ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \ register unsigned long __r5 __asm ("r5") = FUTEX_WAIT; \ register unsigned long __r6 __asm ("r6") = (unsigned long) (val); \ register unsigned long __r7 __asm ("r7") = (timeout); \ __asm __volatile (SYSCALL_WITH_INST_PAD \ : "=z" (__status) \ : "r" (__r3), "r" (__r4), "r" (__r5), \ "r" (__r6), "r" (__r7) \ : "memory", "t"); \ __status; \ }) #define lll_futex_wake(futex, nr) \ do { \ int __ignore; \ register unsigned long __r3 __asm ("r3") = SYS_futex; \ register unsigned long __r4 __asm ("r4") = (unsigned long) (futex); \ register unsigned long __r5 __asm ("r5") = FUTEX_WAKE; \ register unsigned long __r6 __asm ("r6") = (unsigned long) (nr); \ register unsigned long __r7 __asm ("r7") = 0; \ __asm __volatile (SYSCALL_WITH_INST_PAD \ : "=z" (__ignore) \ : "r" (__r3), "r" (__r4), "r" (__r5), \ "r" (__r6), "r" (__r7) \ : "memory", "t"); \ } while (0) extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; /* The states of a lock are: 0 - untaken 1 - taken by one user 2 - taken by more users */ #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) \ (futex != LLL_LOCK_INITIALIZER) /* 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. */ extern int __lll_wait_tid (int *tid) attribute_hidden; #define lll_wait_tid(tid) \ do { \ __typeof (tid) *__tid = &(tid); \ while (*__tid != 0) \ lll_futex_wait (__tid, *__tid); \ } while (0) extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) attribute_hidden; #define lll_timedwait_tid(tid, abstime) \ ({ \ int __result = 0; \ if (tid != 0) \ { \ if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \ __result = EINVAL; \ else \ __result = __lll_timedwait_tid (&tid, abstime); \ } \ __result; }) /* 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 */