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41d4d22399
* sysdeps/i386/i486/bits/atomic.h: Fix a few unused definitions. * sysdeps/unix/sysv/linux/i386/lowlevellock.h: Remove all trace of lll_wake_tid. This was used only to work around kernel limits in the early days. * sysdeps/unix/sysv/linux/s390/lowlevellock.h: Likewise. * sysdeps/unix/sysv/linux/sh/libc-lowlevellock.S: Likewise. * sysdeps/unix/sysv/linux/sh/lowlevellock.S: Likewise. * sysdeps/unix/sysv/linux/sh/lowlevellock.h: Likewise.
238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/* Copyright (C) 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LOWLEVELLOCK_H
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#define _LOWLEVELLOCK_H 1
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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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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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/* Initializer for compatibility lock. */
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#define LLL_MUTEX_LOCK_INITIALIZER (0)
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extern int __lll_mutex_lock_wait (int val, int *__futex) attribute_hidden;
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extern int __lll_mutex_timedlock_wait (int val, int *__futex,
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const struct timespec *abstime)
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attribute_hidden;
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extern int __lll_mutex_unlock_wake (int *__futex) attribute_hidden;
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#define lll_mutex_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) : "r" (&(futex)), "r" (1), "r" (0) \
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: "r0", "r1", "r2", "t", "memory"); \
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__result; })
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#define lll_mutex_lock(futex) \
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(void) ({ int __result, val, *__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 @%2,%0\n\
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add %0,%1\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" (val) : "r" (__futex), "1" (1) \
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: "r0", "r1", "memory"); \
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if (__result) \
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__lll_mutex_lock_wait (__result, __futex); })
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#define lll_mutex_timedlock(futex, timeout) \
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({ int __result, val, *__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 @%2,%0\n\
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add %0,%1\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" (val) : "r" (__futex), "1" (1) \
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: "r0", "r1", "memory"); \
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if (__result) \
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__result = __lll_mutex_timedlock_wait (__result, __futex, timeout); \
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__result; })
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#define lll_mutex_unlock(futex) \
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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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__lll_mutex_unlock_wake (__futex); })
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#define lll_mutex_islocked(futex) \
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(futex != 0)
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/* We have a separate internal lock implementation which is not tied
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to binary compatibility. */
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/* Type for lock object. */
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typedef int lll_lock_t;
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/* Initializers for lock. */
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#define LLL_LOCK_INITIALIZER (1)
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#define LLL_LOCK_INITIALIZER_LOCKED (0)
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extern int __lll_lock_wait (int val, int *__futex) attribute_hidden;
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extern int __lll_unlock_wake (int *__futex) attribute_hidden;
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extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
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/* The states of a lock are:
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1 - untaken
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0 - taken by one user
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<0 - taken by more users */
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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) : "r" (&(futex)), "r" (0), "r" (1) \
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: "r0", "r1", "r2", "t", "memory"); \
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__result; })
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#define lll_lock(futex) \
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(void) ({ int __result, val, *__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 @%2,%0\n\
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add %0,%1\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" (val) : "r" (__futex), "1" (-1) \
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: "r0", "r1", "memory"); \
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if (val < 0) \
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__lll_lock_wait (__result, __futex); })
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#define lll_unlock(futex) \
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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 <= 0) \
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__lll_unlock_wake (__futex); })
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#define lll_islocked(futex) \
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(futex <= 0)
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/* The kernel notifies a process with uses CLONE_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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extern int __lll_wait_tid (int *tid) attribute_hidden;
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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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if (*__tid != 0) \
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__lll_wait_tid (__tid); \
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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 == NULL || 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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/* Conditional variable handling. */
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extern void __lll_cond_wait (pthread_cond_t *cond) attribute_hidden;
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extern int __lll_cond_timedwait (pthread_cond_t *cond,
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const struct timespec *abstime)
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attribute_hidden;
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extern void __lll_cond_wake (pthread_cond_t *cond) attribute_hidden;
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extern void __lll_cond_broadcast (pthread_cond_t *cond) attribute_hidden;
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#define lll_cond_wait(cond) \
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__lll_cond_wait (cond)
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#define lll_cond_timedwait(cond, abstime) \
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__lll_cond_timedwait (cond, abstime)
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#define lll_cond_wake(cond) \
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__lll_cond_wake (cond)
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#define lll_cond_broadcast(cond) \
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__lll_cond_broadcast (cond)
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#endif /* lowlevellock.h */
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