mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
324 lines
10 KiB
C
324 lines
10 KiB
C
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
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>
|
|
|
|
#ifndef LOCK_INSTR
|
|
# ifdef UP
|
|
# define LOCK_INSTR /* nothing */
|
|
# else
|
|
# define LOCK_INSTR "lock;"
|
|
# endif
|
|
#endif
|
|
|
|
#define SYS_futex 240
|
|
#define FUTEX_WAIT 0
|
|
#define FUTEX_WAKE 1
|
|
|
|
|
|
/* Initializer for compatibility lock. */
|
|
#define LLL_MUTEX_LOCK_INITIALIZER (0)
|
|
|
|
|
|
/* Does not preserve %eax and %ecx. */
|
|
extern int __lll_mutex_lock_wait (int val, int *__futex)
|
|
__attribute ((regparm (2))) attribute_hidden;
|
|
/* Does not preserver %eax, %ecx, and %edx. */
|
|
extern int __lll_mutex_timedlock_wait (int val, int *__futex,
|
|
const struct timespec *abstime)
|
|
__attribute ((regparm (3))) attribute_hidden;
|
|
/* Preserves all registers but %eax. */
|
|
extern int __lll_mutex_unlock_wait (int *__futex)
|
|
__attribute ((regparm (1))) attribute_hidden;
|
|
|
|
|
|
#define lll_mutex_trylock(futex) \
|
|
({ unsigned char ret; \
|
|
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1; setne %0" \
|
|
: "=a" (ret), "=m" (futex) \
|
|
: "r" (1), "1" (futex), "0" (0) \
|
|
: "memory"); \
|
|
ret; })
|
|
|
|
|
|
#define lll_mutex_lock(futex) \
|
|
(void) ({ int ignore1, ignore2; \
|
|
__asm __volatile (LOCK_INSTR "xaddl %0, %2\n\t" \
|
|
"testl %0, %0\n\t" \
|
|
"jne 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %2, %%ecx\n\t" \
|
|
"call __lll_mutex_lock_wait\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=a" (ignore1), "=&c" (ignore2), "=m" (futex) \
|
|
: "0" (1), "2" (futex) \
|
|
: "memory"); })
|
|
|
|
|
|
#define lll_mutex_timedlock(futex, timeout) \
|
|
({ int result, ignore1, ignore2; \
|
|
__asm __volatile (LOCK_INSTR "xaddl %0, %3\n\t" \
|
|
"testl %0, %0\n\t" \
|
|
"jne 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %3, %%ecx\n\t" \
|
|
"movl %6, %%edx\n\t" \
|
|
"call __lll_mutex_timedlock_wait\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=a" (result), "=&c" (ignore1), "=&d" (ignore2), \
|
|
"=m" (futex) \
|
|
: "0" (1), "3" (futex), "m" (timeout) \
|
|
: "memory"); \
|
|
result; })
|
|
|
|
|
|
#define lll_mutex_unlock(futex) \
|
|
(void) ({ int ignore; \
|
|
__asm __volatile (LOCK_INSTR "subl $1,%0\n\t" \
|
|
"jne 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %0, %%eax\n\t" \
|
|
"call __lll_mutex_unlock_wake\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=m" (futex), "=&a" (ignore) \
|
|
: "0" (futex) \
|
|
: "memory"); })
|
|
|
|
|
|
#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 ((regparm (2))) attribute_hidden;
|
|
extern int __lll_unlock_wake (int *__futex)
|
|
__attribute ((regparm (1))) 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 */
|
|
|
|
|
|
#if defined NOT_IN_libc || defined UP
|
|
# define lll_trylock(futex) \
|
|
({ unsigned char ret; \
|
|
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1; setne %0" \
|
|
: "=a" (ret), "=m" (futex) \
|
|
: "r" (0), "1" (futex), "0" (1) \
|
|
: "memory"); \
|
|
ret; })
|
|
|
|
|
|
# define lll_lock(futex) \
|
|
(void) ({ int ignore1, ignore2; \
|
|
__asm __volatile (LOCK_INSTR "xaddl %0, %2\n\t" \
|
|
"jne 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %2, %%ecx\n\t" \
|
|
"call __lll_lock_wait\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=a" (ignore1), "=&c" (ignore2), "=m" (futex) \
|
|
: "0" (-1), "2" (futex) \
|
|
: "memory"); })
|
|
|
|
|
|
# define lll_unlock(futex) \
|
|
(void) ({ int ignore; \
|
|
__asm __volatile (LOCK_INSTR "addl $1,%0\n\t" \
|
|
"jng 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %0, %%eax\n\t" \
|
|
"call __lll_unlock_wake\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=m" (futex), "=&a" (ignore) \
|
|
: "0" (futex) \
|
|
: "memory"); })
|
|
#else
|
|
/* Special versions of the macros for use in libc itself. They avoid
|
|
the lock prefix when the thread library is not used.
|
|
|
|
XXX In future we might even want to avoid it on UP machines. */
|
|
# include <tls.h>
|
|
|
|
# define lll_trylock(futex) \
|
|
({ unsigned char ret; \
|
|
__asm __volatile ("cmpl $0, %%gs:%P5\n\t" \
|
|
"je,pt 0f\n\t" \
|
|
"lock\n" \
|
|
"0:\tcmpxchgl %2, %1; setne %0" \
|
|
: "=a" (ret), "=m" (futex) \
|
|
: "r" (0), "1" (futex), "0" (1), \
|
|
"i" (offsetof (tcbhead_t, multiple_threads)) \
|
|
: "memory"); \
|
|
ret; })
|
|
|
|
|
|
# define lll_lock(futex) \
|
|
(void) ({ int ignore1, ignore2; \
|
|
__asm __volatile ("cmpl $0, %%gs:%P5\n\t" \
|
|
"je,pt 0f\n\t" \
|
|
"lock\n" \
|
|
"0:\txaddl %0, %2\n\t" \
|
|
"jne 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %2, %%ecx\n\t" \
|
|
"call __lll_lock_wait\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=a" (ignore1), "=&c" (ignore2), "=m" (futex) \
|
|
: "0" (-1), "2" (futex), \
|
|
"i" (offsetof (tcbhead_t, multiple_threads)) \
|
|
: "memory"); })
|
|
|
|
|
|
# define lll_unlock(futex) \
|
|
(void) ({ int ignore; \
|
|
__asm __volatile ("cmpl $0, %%gs:%P3\n\t" \
|
|
"je,pt 0f\n\t" \
|
|
"lock\n" \
|
|
"0:\taddl $1,%0\n\t" \
|
|
"jng 1f\n\t" \
|
|
".subsection 1\n" \
|
|
"1:\tleal %0, %%eax\n\t" \
|
|
"call __lll_unlock_wake\n\t" \
|
|
"jmp 2f\n\t" \
|
|
".previous\n" \
|
|
"2:" \
|
|
: "=m" (futex), "=&a" (ignore) \
|
|
: "0" (futex), \
|
|
"i" (offsetof (tcbhead_t, multiple_threads)) \
|
|
: "memory"); })
|
|
#endif
|
|
|
|
|
|
#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.
|
|
|
|
The macro parameter must not have any side effect. */
|
|
#ifdef PIC
|
|
# define LLL_TID_EBX_LOAD "xchgl %2, %%ebx\n"
|
|
# define LLL_TID_EBX_REG "D"
|
|
#else
|
|
# define LLL_TID_EBX_LOAD
|
|
# define LLL_TID_EBX_REG "b"
|
|
#endif
|
|
|
|
#ifdef I386_USE_SYSENTER
|
|
# ifdef SHARED
|
|
# define LLL_TID_ENTER_KERNEL "call *%%gs:%P6\n\t"
|
|
# else
|
|
# define LLL_TID_ENTER_KERNEL "call *_dl_sysinfo\n\t"
|
|
# endif
|
|
#else
|
|
# define LLL_TID_ENTER_KERNEL "int $0x80\n\t"
|
|
#endif
|
|
|
|
#define lll_wait_tid(tid) \
|
|
do { \
|
|
int __ignore; \
|
|
register __typeof (tid) _tid asm ("edx") = (tid); \
|
|
if (_tid != 0) \
|
|
__asm __volatile (LLL_TID_EBX_LOAD \
|
|
"1:\tmovl %1, %%eax\n\t" \
|
|
LLL_TID_ENTER_KERNEL \
|
|
"cmpl $0, (%%ebx)\n\t" \
|
|
"jne,pn 1b\n\t" \
|
|
LLL_TID_EBX_LOAD \
|
|
: "=&a" (__ignore) \
|
|
: "i" (SYS_futex), LLL_TID_EBX_REG (&tid), "S" (0), \
|
|
"c" (FUTEX_WAIT), "d" (_tid), \
|
|
"i" (offsetof (tcbhead_t, sysinfo))); \
|
|
} while (0)
|
|
|
|
extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
|
|
__attribute__ ((regparm (2))) 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; })
|
|
|
|
|
|
/* Conditional variable handling. */
|
|
|
|
extern void __lll_cond_wait (pthread_cond_t *cond)
|
|
__attribute ((regparm (1))) attribute_hidden;
|
|
extern int __lll_cond_timedwait (pthread_cond_t *cond,
|
|
const struct timespec *abstime)
|
|
__attribute ((regparm (2))) attribute_hidden;
|
|
extern void __lll_cond_wake (pthread_cond_t *cond)
|
|
__attribute ((regparm (1))) attribute_hidden;
|
|
extern void __lll_cond_broadcast (pthread_cond_t *cond)
|
|
__attribute ((regparm (1))) 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 */
|