diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h new file mode 100644 index 0000000000..d9a69c7a48 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h @@ -0,0 +1,245 @@ +/* Copyright (C) 2003 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 <time.h> +#include <sys/param.h> +#include <bits/pthreadtypes.h> + +#define SYS_futex 240 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + + +/* Initializer for compatibility lock. */ +#define LLL_MUTEX_LOCK_INITIALIZER (0) + +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" (1), "r" (0) \ + : "r0", "r1", "r2", "t", "memory"); \ + __result; }) + +#define lll_mutex_lock(futex) \ + (void) ({ int __result, val, *__futex = &(futex); \ + __asm __volatile ("\ + .align 2\n\ + mova 1f,r0\n\ + mov r15,r1\n\ + mov #-6,r15\n\ + 0: mov.l @%2,%0\n\ + add %0,%1\n\ + mov.l %1,@%2\n\ + 1: mov r1,r15"\ + : "=&r" (__result), "=&r" (val) : "r" (__futex), "1" (1) \ + : "r0", "r1", "memory"); \ + if (__result) \ + __lll_mutex_lock_wait (__result, __futex); }) + +#define lll_mutex_timedlock(futex, timeout) \ + ({ int __result, val, *__futex = &(futex); \ + __asm __volatile ("\ + .align 2\n\ + mova 1f,r0\n\ + mov r15,r1\n\ + mov #-6,r15\n\ + 0: mov.l @%2,%0\n\ + add %0,%1\n\ + mov.l %1,@%2\n\ + 1: mov r1,r15"\ + : "=&r" (__result), "=&r" (val) : "r" (__futex), "1" (1) \ + : "r0", "r1", "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 (1) +#define LLL_LOCK_INITIALIZER_LOCKED (0) + + +extern int __lll_lock_wait (int val, int *__futex) attribute_hidden; +extern int __lll_unlock_wake (int *__futex) attribute_hidden; +extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; + + +/* The states of a lock are: + 1 - untaken + 0 - taken by one user + <0 - taken by more users */ + + +#define lll_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" (0), "r" (1) \ + : "r0", "r1", "r2", "t", "memory"); \ + __result; }) + +#define lll_lock(futex) \ + (void) ({ int __result, val, *__futex = &(futex); \ + __asm __volatile ("\ + .align 2\n\ + mova 1f,r0\n\ + mov r15,r1\n\ + mov #-6,r15\n\ + 0: mov.l @%2,%0\n\ + add %0,%1\n\ + mov.l %1,@%2\n\ + 1: mov r1,r15"\ + : "=&r" (__result), "=&r" (val) : "r" (__futex), "1" (-1) \ + : "r0", "r1", "memory"); \ + if (val < 0) \ + __lll_lock_wait (__result, __futex); }) + +#define lll_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 <= 0) \ + __lll_unlock_wake (__futex); }) + +#define lll_islocked(futex) \ + (futex <= 0) + + +/* 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); \ + if (*__tid != 0) \ + __lll_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 == NULL || abstime->tv_nsec >= 1000000000) \ + __result = EINVAL; \ + else \ + __result = __lll_timedwait_tid (&tid, abstime); \ + } \ + __result; }) + + +extern int __lll_wake_tid (int *tid) attribute_hidden; +#define lll_wake_tid(tid) \ + do { \ + (tid) = 0; \ + ___lll_wake_tid (&tid); \ + } while (0) + + +/* 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 */ |