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420 lines
12 KiB
C
420 lines
12 KiB
C
/* Copyright (C) 2003-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LOWLEVELLOCK_H
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#define _LOWLEVELLOCK_H 1
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#ifndef __ASSEMBLER__
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#include <time.h>
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#include <sys/param.h>
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#include <bits/pthreadtypes.h>
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#include <kernel-features.h>
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#endif
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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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#define FUTEX_LOCK_PI 6
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#define FUTEX_UNLOCK_PI 7
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#define FUTEX_TRYLOCK_PI 8
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#define FUTEX_WAIT_BITSET 9
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#define FUTEX_WAKE_BITSET 10
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#define FUTEX_PRIVATE_FLAG 128
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#define FUTEX_CLOCK_REALTIME 256
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#define FUTEX_BITSET_MATCH_ANY 0xffffffff
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#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
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/* Values for 'private' parameter of locking macros. Yes, the
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definition seems to be backwards. But it is not. The bit will be
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reversed before passing to the system call. */
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#define LLL_PRIVATE 0
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#define LLL_SHARED FUTEX_PRIVATE_FLAG
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#if !defined NOT_IN_libc || defined IS_IN_rtld
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/* In libc.so or ld.so all futexes are private. */
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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((fl) | FUTEX_PRIVATE_FLAG)
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# else
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# define __lll_private_flag(fl, private) \
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((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
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# endif
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#else
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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(((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
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# else
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# define __lll_private_flag(fl, private) \
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(__builtin_constant_p (private) \
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? ((private) == 0 \
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? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
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: (fl)) \
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: ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG) \
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& THREAD_GETMEM (THREAD_SELF, header.private_futex))))
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# endif
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#endif
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#ifndef __ASSEMBLER__
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/* Initializer for compatibility lock. */
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#define LLL_LOCK_INITIALIZER (0)
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#define LLL_LOCK_INITIALIZER_LOCKED (1)
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#define LLL_LOCK_INITIALIZER_WAITERS (2)
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extern int __lll_lock_wait_private (int val, int *__futex)
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attribute_hidden;
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extern int __lll_lock_wait (int val, int *__futex, int private)
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attribute_hidden;
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extern int __lll_timedlock_wait (int val, int *__futex,
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const struct timespec *abstime, int private)
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attribute_hidden;
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extern int __lll_robust_lock_wait (int val, int *__futex, int private)
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attribute_hidden;
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extern int __lll_robust_timedlock_wait (int val, int *__futex,
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const struct timespec *abstime,
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int private)
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attribute_hidden;
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extern int __lll_unlock_wake_private (int *__futex) attribute_hidden;
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extern int __lll_unlock_wake (int *__futex, int private) attribute_hidden;
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#define lll_trylock(futex) \
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({ unsigned char __result; \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%1,r2\n\
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cmp/eq r2,%3\n\
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bf 1f\n\
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mov.l %2,@%1\n\
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1: mov r1,r15\n\
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mov #-1,%0\n\
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negc %0,%0"\
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: "=r" (__result) \
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: "r" (&(futex)), \
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"r" (LLL_LOCK_INITIALIZER_LOCKED), \
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"r" (LLL_LOCK_INITIALIZER) \
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: "r0", "r1", "r2", "t", "memory"); \
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__result; })
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#define lll_robust_trylock(futex, id) \
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({ unsigned char __result; \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%1,r2\n\
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cmp/eq r2,%3\n\
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bf 1f\n\
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mov.l %2,@%1\n\
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1: mov r1,r15\n\
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mov #-1,%0\n\
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negc %0,%0"\
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: "=r" (__result) \
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: "r" (&(futex)), \
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"r" (id), \
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"r" (LLL_LOCK_INITIALIZER) \
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: "r0", "r1", "r2", "t", "memory"); \
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__result; })
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#define lll_cond_trylock(futex) \
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({ unsigned char __result; \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%1,r2\n\
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cmp/eq r2,%3\n\
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bf 1f\n\
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mov.l %2,@%1\n\
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1: mov r1,r15\n\
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mov #-1,%0\n\
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negc %0,%0"\
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: "=r" (__result) \
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: "r" (&(futex)), \
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"r" (LLL_LOCK_INITIALIZER_WAITERS), \
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"r" (LLL_LOCK_INITIALIZER) \
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: "r0", "r1", "r2", "t", "memory"); \
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__result; })
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#define lll_lock(futex, private) \
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(void) ({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (1), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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{ \
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if (__builtin_constant_p (private) \
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&& (private) == LLL_PRIVATE) \
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__lll_lock_wait_private (__result, __futex); \
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else \
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__lll_lock_wait (__result, __futex, (private)); \
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} \
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})
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#define lll_robust_lock(futex, id, private) \
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({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (id), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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__result = __lll_robust_lock_wait (__result, __futex, private); \
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__result; })
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/* Special version of lll_mutex_lock which causes the unlock function to
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always wakeup waiters. */
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#define lll_cond_lock(futex, private) \
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(void) ({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (2), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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__lll_lock_wait (__result, __futex, private); })
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#define lll_robust_cond_lock(futex, id, private) \
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({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (id | FUTEX_WAITERS), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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__result = __lll_robust_lock_wait (__result, __futex, private); \
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__result; })
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#define lll_timedlock(futex, timeout, private) \
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({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (1), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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__result = __lll_timedlock_wait (__result, __futex, timeout, private); \
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__result; })
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#define lll_robust_timedlock(futex, timeout, id, private) \
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({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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nop\n\
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mov r15,r1\n\
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mov #-8,r15\n\
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0: mov.l @%2,%0\n\
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tst %0,%0\n\
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bf 1f\n\
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mov.l %1,@%2\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (id), "r" (__futex) \
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: "r0", "r1", "t", "memory"); \
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if (__result) \
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__result = __lll_robust_timedlock_wait (__result, __futex, \
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timeout, private); \
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__result; })
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#define lll_unlock(futex, private) \
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(void) ({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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mov r15,r1\n\
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mov #-6,r15\n\
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0: mov.l @%1,%0\n\
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add #-1,%0\n\
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mov.l %0,@%1\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (__futex) \
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: "r0", "r1", "memory"); \
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if (__result) \
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{ \
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if (__builtin_constant_p (private) \
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&& (private) == LLL_PRIVATE) \
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__lll_unlock_wake_private (__futex); \
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else \
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__lll_unlock_wake (__futex, (private)); \
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} \
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})
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#define lll_robust_unlock(futex, private) \
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(void) ({ int __result, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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mov r15,r1\n\
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mov #-6,r15\n\
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0: mov.l @%1,%0\n\
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and %2,%0\n\
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mov.l %0,@%1\n\
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1: mov r1,r15"\
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: "=&r" (__result) : "r" (__futex), "r" (FUTEX_WAITERS) \
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: "r0", "r1", "memory"); \
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if (__result) \
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__lll_unlock_wake (__futex, private); })
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#define lll_robust_dead(futex, private) \
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(void) ({ int __ignore, *__futex = &(futex); \
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__asm __volatile ("\
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.align 2\n\
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mova 1f,r0\n\
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mov r15,r1\n\
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mov #-6,r15\n\
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0: mov.l @%1,%0\n\
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or %2,%0\n\
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mov.l %0,@%1\n\
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1: mov r1,r15"\
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: "=&r" (__ignore) : "r" (__futex), "r" (FUTEX_OWNER_DIED) \
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: "r0", "r1", "memory"); \
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lll_futex_wake (__futex, 1, private); })
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# ifdef NEED_SYSCALL_INST_PAD
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# define SYSCALL_WITH_INST_PAD "\
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trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
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# else
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# define SYSCALL_WITH_INST_PAD "\
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trapa #0x14"
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# endif
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#define lll_futex_wait(futex, val, private) \
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lll_futex_timed_wait (futex, val, NULL, private)
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#define lll_futex_timed_wait(futex, val, timeout, private) \
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({ \
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int __status; \
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register unsigned long __r3 asm ("r3") = SYS_futex; \
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register unsigned long __r4 asm ("r4") = (unsigned long) (futex); \
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register unsigned long __r5 asm ("r5") \
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= __lll_private_flag (FUTEX_WAIT, private); \
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register unsigned long __r6 asm ("r6") = (unsigned long) (val); \
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register unsigned long __r7 asm ("r7") = (timeout); \
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__asm __volatile (SYSCALL_WITH_INST_PAD \
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: "=z" (__status) \
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: "r" (__r3), "r" (__r4), "r" (__r5), \
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"r" (__r6), "r" (__r7) \
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: "memory", "t"); \
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__status; \
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})
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#define lll_futex_wake(futex, nr, private) \
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do { \
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int __ignore; \
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register unsigned long __r3 asm ("r3") = SYS_futex; \
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register unsigned long __r4 asm ("r4") = (unsigned long) (futex); \
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register unsigned long __r5 asm ("r5") \
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= __lll_private_flag (FUTEX_WAKE, private); \
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register unsigned long __r6 asm ("r6") = (unsigned long) (nr); \
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register unsigned long __r7 asm ("r7") = 0; \
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__asm __volatile (SYSCALL_WITH_INST_PAD \
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: "=z" (__ignore) \
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: "r" (__r3), "r" (__r4), "r" (__r5), \
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"r" (__r6), "r" (__r7) \
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: "memory", "t"); \
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} while (0)
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#define lll_islocked(futex) \
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(futex != LLL_LOCK_INITIALIZER)
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/* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex
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wakeup when the clone terminates. The memory location contains the
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thread ID while the clone is running and is reset to zero
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afterwards. */
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#define lll_wait_tid(tid) \
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do { \
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__typeof (tid) *__tid = &(tid); \
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while (*__tid != 0) \
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lll_futex_wait (__tid, *__tid, LLL_SHARED); \
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} while (0)
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extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
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attribute_hidden;
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#define lll_timedwait_tid(tid, abstime) \
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({ \
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int __result = 0; \
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if (tid != 0) \
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{ \
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if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
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__result = EINVAL; \
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else \
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__result = __lll_timedwait_tid (&tid, abstime); \
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} \
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__result; })
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#endif /* !__ASSEMBLER__ */
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#endif /* lowlevellock.h */
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