lowlevellock.h

/* Copyright (C) 2002-2013 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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _LOWLEVELLOCK_H
#define _LOWLEVELLOCK_H	1

#include <stap-probe.h>

#ifndef __ASSEMBLER__
# include <time.h>
# include <sys/param.h>
# include <bits/pthreadtypes.h>
# include <kernel-features.h>
# include <tcb-offsets.h>

# ifndef LOCK_INSTR
#  ifdef UP
#   define LOCK_INSTR	/* nothing */
#  else
#   define LOCK_INSTR "lock;"
#  endif
# endif
#else
# ifndef LOCK
#  ifdef UP
#   define LOCK
#  else
#   define LOCK lock
#  endif
# endif
#endif

#define SYS_futex		240
#define FUTEX_WAIT		0
#define FUTEX_WAKE		1
#define FUTEX_CMP_REQUEUE	4
#define FUTEX_WAKE_OP		5
#define FUTEX_LOCK_PI		6
#define FUTEX_UNLOCK_PI		7
#define FUTEX_TRYLOCK_PI	8
#define FUTEX_WAIT_BITSET	9
#define FUTEX_WAKE_BITSET	10
#define FUTEX_WAIT_REQUEUE_PI	11
#define FUTEX_CMP_REQUEUE_PI	12
#define FUTEX_PRIVATE_FLAG	128
#define FUTEX_CLOCK_REALTIME	256

#define FUTEX_BITSET_MATCH_ANY	0xffffffff

#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE	((4 << 24) | 1)

/* Values for 'private' parameter of locking macros.  Yes, the
   definition seems to be backwards.  But it is not.  The bit will be
   reversed before passing to the system call.  */
#define LLL_PRIVATE	0
#define LLL_SHARED	FUTEX_PRIVATE_FLAG


#if !defined NOT_IN_libc || defined IS_IN_rtld
/* In libc.so or ld.so all futexes are private.  */
# ifdef __ASSUME_PRIVATE_FUTEX
#  define __lll_private_flag(fl, private) \
  ((fl) | FUTEX_PRIVATE_FLAG)
# else
#  define __lll_private_flag(fl, private) \
  ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
# endif
#else
# ifdef __ASSUME_PRIVATE_FUTEX
#  define __lll_private_flag(fl, private) \
  (((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
# else
#  define __lll_private_flag(fl, private) \
  (__builtin_constant_p (private)					      \
   ? ((private) == 0							      \
      ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))	      \
      : (fl))								      \
   : ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG);		      \
	asm ("andl %%gs:%P1, %0" : "+r" (__fl)				      \
	     : "i" (offsetof (struct pthread, header.private_futex)));	      \
	__fl | (fl); }))
# endif
#endif

#ifndef __ASSEMBLER__

/* Initializer for compatibility lock.  */
#define LLL_LOCK_INITIALIZER		(0)
#define LLL_LOCK_INITIALIZER_LOCKED	(1)
#define LLL_LOCK_INITIALIZER_WAITERS	(2)


#ifdef PIC
# define LLL_EBX_LOAD	"xchgl %2, %%ebx\n"
# define LLL_EBX_REG	"D"
#else
# define LLL_EBX_LOAD
# define LLL_EBX_REG	"b"
#endif

#ifdef I386_USE_SYSENTER
# ifdef SHARED
#  define LLL_ENTER_KERNEL	"call *%%gs:%P6\n\t"
# else
#  define LLL_ENTER_KERNEL	"call *_dl_sysinfo\n\t"
# endif
#else
# define LLL_ENTER_KERNEL	"int $0x80\n\t"
#endif

/* Delay in spinlock loop.  */
#define BUSY_WAIT_NOP	asm ("rep; nop")


#define LLL_STUB_UNWIND_INFO_START \
	".section	.eh_frame,\"a\",@progbits\n"		\
"5:\t"	".long	7f-6f	# Length of Common Information Entry\n"	\
"6:\t"	".long	0x0	# CIE Identifier Tag\n\t"		\
	".byte	0x1	# CIE Version\n\t"			\
	".ascii \"zR\\0\"	# CIE Augmentation\n\t"		\
	".uleb128 0x1	# CIE Code Alignment Factor\n\t"	\
	".sleb128 -4	# CIE Data Alignment Factor\n\t"	\
	".byte	0x8	# CIE RA Column\n\t"			\
	".uleb128 0x1	# Augmentation size\n\t"		\
	".byte	0x1b	# FDE Encoding (pcrel sdata4)\n\t"	\
	".byte	0xc	# DW_CFA_def_cfa\n\t"			\
	".uleb128 0x4\n\t"					\
	".uleb128 0x0\n\t"					\
	".align 4\n"						\
"7:\t"	".long	17f-8f	# FDE Length\n"				\
"8:\t"	".long	8b-5b	# FDE CIE offset\n\t"			\
	".long	1b-.	# FDE initial location\n\t"		\
	".long	4b-1b	# FDE address range\n\t"		\
	".uleb128 0x0	# Augmentation size\n\t"		\
	".byte	0x16	# DW_CFA_val_expression\n\t"		\
	".uleb128 0x8\n\t"					\
	".uleb128 10f-9f\n"					\
"9:\t"	".byte	0x78	# DW_OP_breg8\n\t"			\
	".sleb128 3b-1b\n"
#define LLL_STUB_UNWIND_INFO_END \
	".byte	0x16	# DW_CFA_val_expression\n\t"		\
	".uleb128 0x8\n\t"					\
	".uleb128 12f-11f\n"					\
"11:\t"	".byte	0x78	# DW_OP_breg8\n\t"			\
	".sleb128 3b-2b\n"					\
"12:\t"	".byte	0x40 + (3b-2b-1) # DW_CFA_advance_loc\n\t"	\
	".byte	0x16	# DW_CFA_val_expression\n\t"		\
	".uleb128 0x8\n\t"					\
	".uleb128 16f-13f\n"					\
"13:\t"	".byte	0x78	# DW_OP_breg8\n\t"			\
	".sleb128 15f-14f\n\t"					\
	".byte	0x0d	# DW_OP_const4s\n"			\
"14:\t"	".4byte	3b-.\n\t"					\
	".byte	0x1c	# DW_OP_minus\n\t"			\
	".byte	0x0d	# DW_OP_const4s\n"			\
"15:\t"	".4byte	18f-.\n\t"					\
	".byte	0x22	# DW_OP_plus\n"				\
"16:\t"	".align 4\n"						\
"17:\t"	".previous\n"

/* Unwind info for
   1: lea ..., ...
   2: call ...
   3: jmp 18f
   4:
   snippet.  */
#define LLL_STUB_UNWIND_INFO_3 \
LLL_STUB_UNWIND_INFO_START					\
"10:\t"	".byte	0x40 + (2b-1b) # DW_CFA_advance_loc\n\t"	\
LLL_STUB_UNWIND_INFO_END

/* Unwind info for
   1: lea ..., ...
   0: movl ..., ...
   2: call ...
   3: jmp 18f
   4:
   snippet.  */
#define LLL_STUB_UNWIND_INFO_4 \
LLL_STUB_UNWIND_INFO_START					\
"10:\t"	".byte	0x40 + (0b-1b) # DW_CFA_advance_loc\n\t"	\
	".byte	0x16	# DW_CFA_val_expression\n\t"		\
	".uleb128 0x8\n\t"					\
	".uleb128 20f-19f\n"					\
"19:\t"	".byte	0x78	# DW_OP_breg8\n\t"			\
	".sleb128 3b-0b\n"					\
"20:\t"	".byte	0x40 + (2b-0b) # DW_CFA_advance_loc\n\t"	\
LLL_STUB_UNWIND_INFO_END


#define lll_futex_wait(futex, val, private) \
  lll_futex_timed_wait (futex, val, NULL, private)


#define lll_futex_timed_wait(futex, val, timeout, private) \
  ({									      \
    int __status;							      \
    register __typeof (val) _val asm ("edx") = (val);			      \
    __asm __volatile (LLL_EBX_LOAD					      \
		      LLL_ENTER_KERNEL					      \
		      LLL_EBX_LOAD					      \
		      : "=a" (__status)					      \
		      : "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout),  \
			"c" (__lll_private_flag (FUTEX_WAIT, private)),	      \
			"d" (_val), "i" (offsetof (tcbhead_t, sysinfo))	      \
		      : "memory");					      \
    __status;								      \
  })


#define lll_futex_wake(futex, nr, private) \
  ({									      \
    int __status;							      \
    register __typeof (nr) _nr asm ("edx") = (nr);			      \
    LIBC_PROBE (lll_futex_wake, 3, futex, nr, private);                       \
    __asm __volatile (LLL_EBX_LOAD					      \
		      LLL_ENTER_KERNEL					      \
		      LLL_EBX_LOAD					      \
		      : "=a" (__status)					      \
		      : "0" (SYS_futex), LLL_EBX_REG (futex),		      \
			"c" (__lll_private_flag (FUTEX_WAKE, private)),	      \
			"d" (_nr),					      \
			"i" (0) /* phony, to align next arg's number */,      \
			"i" (offsetof (tcbhead_t, sysinfo)));		      \
    __status;								      \
  })


/* NB: in the lll_trylock macro we simply return the value in %eax
   after the cmpxchg instruction.  In case the operation succeded this
   value is zero.  In case the operation failed, the cmpxchg instruction
   has loaded the current value of the memory work which is guaranteed
   to be nonzero.  */
#if defined NOT_IN_libc || defined UP
# define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1"
#else
# define __lll_trylock_asm "cmpl $0, %%gs:%P5\n\t" \
			   "je 0f\n\t"					      \
			   "lock\n"					      \
			   "0:\tcmpxchgl %2, %1"
#endif

#define lll_trylock(futex) \
  ({ int ret;								      \
     __asm __volatile (__lll_trylock_asm				      \
		       : "=a" (ret), "=m" (futex)			      \
		       : "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex),      \
			 "0" (LLL_LOCK_INITIALIZER),			      \
			 "i" (MULTIPLE_THREADS_OFFSET)			      \
		       : "memory");					      \
     ret; })

#define lll_robust_trylock(futex, id) \
  ({ int ret;								      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1"			      \
		       : "=a" (ret), "=m" (futex)			      \
		       : "r" (id), "m" (futex),				      \
			 "0" (LLL_LOCK_INITIALIZER)			      \
		       : "memory");					      \
     ret; })


#define lll_cond_trylock(futex) \
  ({ int ret;								      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1"			      \
		       : "=a" (ret), "=m" (futex)			      \
		       : "r" (LLL_LOCK_INITIALIZER_WAITERS),		      \
			 "m" (futex), "0" (LLL_LOCK_INITIALIZER)	      \
		       : "memory");					      \
     ret; })

#if defined NOT_IN_libc || defined UP
# define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %1, %2\n\t"
#else
# define __lll_lock_asm_start "cmpl $0, %%gs:%P6\n\t"			      \
			      "je 0f\n\t"				      \
			      "lock\n"					      \
			      "0:\tcmpxchgl %1, %2\n\t"
#endif

#define lll_lock(futex, private) \
  (void)								      \
    ({ int ignore1, ignore2;						      \
       if (__builtin_constant_p (private) && (private) == LLL_PRIVATE)	      \
	 __asm __volatile (__lll_lock_asm_start				      \
			   "jnz _L_lock_%=\n\t"				      \
			   ".subsection 1\n\t"				      \
			   ".type _L_lock_%=,@function\n"		      \
			   "_L_lock_%=:\n"				      \
			   "1:\tleal %2, %%ecx\n"			      \
			   "2:\tcall __lll_lock_wait_private\n" 	      \
			   "3:\tjmp 18f\n"				      \
			   "4:\t.size _L_lock_%=, 4b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_3			      \
			   "18:"					      \
			   : "=a" (ignore1), "=c" (ignore2), "=m" (futex)     \
			   : "0" (0), "1" (1), "m" (futex),		      \
			     "i" (MULTIPLE_THREADS_OFFSET)		      \
			   : "memory");					      \
       else								      \
	 {								      \
	   int ignore3;							      \
	   __asm __volatile (__lll_lock_asm_start			      \
			     "jnz _L_lock_%=\n\t"			      \
			     ".subsection 1\n\t"			      \
			     ".type _L_lock_%=,@function\n"		      \
			     "_L_lock_%=:\n"				      \
			     "1:\tleal %2, %%edx\n"			      \
			     "0:\tmovl %8, %%ecx\n"			      \
			     "2:\tcall __lll_lock_wait\n"		      \
			     "3:\tjmp 18f\n"				      \
			     "4:\t.size _L_lock_%=, 4b-1b\n\t"		      \
			     ".previous\n"				      \
			     LLL_STUB_UNWIND_INFO_4			      \
			     "18:"					      \
			     : "=a" (ignore1), "=c" (ignore2),		      \
			       "=m" (futex), "=&d" (ignore3) 		      \
			     : "1" (1), "m" (futex),			      \
			       "i" (MULTIPLE_THREADS_OFFSET), "0" (0),	      \
			       "g" ((int) (private))			      \
			     : "memory");				      \
	 }								      \
    })

#define lll_robust_lock(futex, id, private) \
  ({ int result, ignore1, ignore2;					      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t"			      \
		       "jnz _L_robust_lock_%=\n\t"			      \
		       ".subsection 1\n\t"				      \
		       ".type _L_robust_lock_%=,@function\n"		      \
		       "_L_robust_lock_%=:\n"				      \
		       "1:\tleal %2, %%edx\n"				      \
		       "0:\tmovl %7, %%ecx\n"				      \
		       "2:\tcall __lll_robust_lock_wait\n"		      \
		       "3:\tjmp 18f\n"					      \
		       "4:\t.size _L_robust_lock_%=, 4b-1b\n\t"		      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_4				      \
		       "18:"						      \
		       : "=a" (result), "=c" (ignore1), "=m" (futex),	      \
			 "=&d" (ignore2)				      \
		       : "0" (0), "1" (id), "m" (futex), "g" ((int) (private))\
		       : "memory");					      \
     result; })


/* Special version of lll_lock which causes the unlock function to
   always wakeup waiters.  */
#define lll_cond_lock(futex, private) \
  (void)								      \
    ({ int ignore1, ignore2, ignore3;					      \
       __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t"		      \
			 "jnz _L_cond_lock_%=\n\t"			      \
			 ".subsection 1\n\t"				      \
			 ".type _L_cond_lock_%=,@function\n"		      \
			 "_L_cond_lock_%=:\n"				      \
			 "1:\tleal %2, %%edx\n"				      \
			 "0:\tmovl %7, %%ecx\n"				      \
			 "2:\tcall __lll_lock_wait\n"			      \
			 "3:\tjmp 18f\n"				      \
			 "4:\t.size _L_cond_lock_%=, 4b-1b\n\t"		      \
			 ".previous\n"					      \
			 LLL_STUB_UNWIND_INFO_4				      \
			 "18:"						      \
			 : "=a" (ignore1), "=c" (ignore2), "=m" (futex),      \
			   "=&d" (ignore3)				      \
			 : "0" (0), "1" (2), "m" (futex), "g" ((int) (private))\
			 : "memory");					      \
    })


#define lll_robust_cond_lock(futex, id, private) \
  ({ int result, ignore1, ignore2;					      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t"			      \
		       "jnz _L_robust_cond_lock_%=\n\t"			      \
		       ".subsection 1\n\t"				      \
		       ".type _L_robust_cond_lock_%=,@function\n"	      \
		       "_L_robust_cond_lock_%=:\n"			      \
		       "1:\tleal %2, %%edx\n"				      \
		       "0:\tmovl %7, %%ecx\n"				      \
		       "2:\tcall __lll_robust_lock_wait\n"		      \
		       "3:\tjmp 18f\n"					      \
		       "4:\t.size _L_robust_cond_lock_%=, 4b-1b\n\t"	      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_4				      \
		       "18:"						      \
		       : "=a" (result), "=c" (ignore1), "=m" (futex),	      \
			 "=&d" (ignore2)				      \
		       : "0" (0), "1" (id | FUTEX_WAITERS), "m" (futex),      \
			 "g" ((int) (private))				      \
		       : "memory");					      \
     result; })


#define lll_timedlock(futex, timeout, private) \
  ({ int result, ignore1, ignore2, ignore3;				      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t"			      \
		       "jnz _L_timedlock_%=\n\t"			      \
		       ".subsection 1\n\t"				      \
		       ".type _L_timedlock_%=,@function\n"		      \
		       "_L_timedlock_%=:\n"				      \
		       "1:\tleal %3, %%ecx\n"				      \
		       "0:\tmovl %8, %%edx\n"				      \
		       "2:\tcall __lll_timedlock_wait\n"		      \
		       "3:\tjmp 18f\n"					      \
		       "4:\t.size _L_timedlock_%=, 4b-1b\n\t"		      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_4				      \
		       "18:"						      \
		       : "=a" (result), "=c" (ignore1), "=&d" (ignore2),      \
			 "=m" (futex), "=S" (ignore3)			      \
		       : "0" (0), "1" (1), "m" (futex), "m" (timeout),	      \
			 "4" ((int) (private))				      \
		       : "memory");					      \
     result; })

extern int __lll_timedlock_elision (int *futex, short *adapt_count,
					 const struct timespec *timeout,
					 int private) attribute_hidden;

#define lll_timedlock_elision(futex, adapt_count, timeout, private)	\
  __lll_timedlock_elision(&(futex), &(adapt_count), timeout, private)

#define lll_robust_timedlock(futex, timeout, id, private) \
  ({ int result, ignore1, ignore2, ignore3;				      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t"			      \
		       "jnz _L_robust_timedlock_%=\n\t"			      \
		       ".subsection 1\n\t"				      \
		       ".type _L_robust_timedlock_%=,@function\n"	      \
		       "_L_robust_timedlock_%=:\n"			      \
		       "1:\tleal %3, %%ecx\n"				      \
		       "0:\tmovl %8, %%edx\n"				      \
		       "2:\tcall __lll_robust_timedlock_wait\n"		      \
		       "3:\tjmp 18f\n"					      \
		       "4:\t.size _L_robust_timedlock_%=, 4b-1b\n\t"	      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_4				      \
		       "18:"						      \
		       : "=a" (result), "=c" (ignore1), "=&d" (ignore2),      \
			 "=m" (futex), "=S" (ignore3)			      \
		       : "0" (0), "1" (id), "m" (futex), "m" (timeout),	      \
			 "4" ((int) (private))				      \
		       : "memory");					      \
     result; })

#if defined NOT_IN_libc || defined UP
# define __lll_unlock_asm LOCK_INSTR "subl $1, %0\n\t"
#else
# define __lll_unlock_asm "cmpl $0, %%gs:%P3\n\t"			      \
			  "je 0f\n\t"					      \
			  "lock\n"					      \
			  "0:\tsubl $1,%0\n\t"
#endif

#define lll_unlock(futex, private) \
  (void)								      \
    ({ int ignore;							      \
       if (__builtin_constant_p (private) && (private) == LLL_PRIVATE)	      \
	 __asm __volatile (__lll_unlock_asm				      \
			   "jne _L_unlock_%=\n\t"			      \
			   ".subsection 1\n\t"				      \
			   ".type _L_unlock_%=,@function\n"		      \
			   "_L_unlock_%=:\n"				      \
			   "1:\tleal %0, %%eax\n"			      \
			   "2:\tcall __lll_unlock_wake_private\n"	      \
			   "3:\tjmp 18f\n"				      \
			   "4:\t.size _L_unlock_%=, 4b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_3			      \
			   "18:"					      \
			   : "=m" (futex), "=&a" (ignore)		      \
			   : "m" (futex), "i" (MULTIPLE_THREADS_OFFSET)	      \
			   : "memory");					      \
       else								      \
	 {								      \
	   int ignore2;							      \
	   __asm __volatile (__lll_unlock_asm				      \
			     "jne _L_unlock_%=\n\t"			      \
			     ".subsection 1\n\t"			      \
			     ".type _L_unlock_%=,@function\n"		      \
			     "_L_unlock_%=:\n"				      \
			     "1:\tleal %0, %%eax\n"			      \
			     "0:\tmovl %5, %%ecx\n"			      \
			     "2:\tcall __lll_unlock_wake\n"		      \
			     "3:\tjmp 18f\n"				      \
			     "4:\t.size _L_unlock_%=, 4b-1b\n\t"	      \
			     ".previous\n"				      \
			     LLL_STUB_UNWIND_INFO_4			      \
			     "18:"					      \
			     : "=m" (futex), "=&a" (ignore), "=&c" (ignore2)  \
			     : "i" (MULTIPLE_THREADS_OFFSET), "m" (futex),    \
			       "g" ((int) (private))			      \
			     : "memory");				      \
	 }								      \
    })

#define lll_robust_unlock(futex, private) \
  (void)								      \
    ({ int ignore, ignore2;						      \
       __asm __volatile (LOCK_INSTR "andl %3, %0\n\t"			      \
			 "jne _L_robust_unlock_%=\n\t"			      \
			 ".subsection 1\n\t"				      \
			 ".type _L_robust_unlock_%=,@function\n"	      \
			 "_L_robust_unlock_%=:\n\t"			      \
			 "1:\tleal %0, %%eax\n"				      \
			 "0:\tmovl %5, %%ecx\n"				      \
			 "2:\tcall __lll_unlock_wake\n"			      \
			 "3:\tjmp 18f\n"				      \
			 "4:\t.size _L_robust_unlock_%=, 4b-1b\n\t"	      \
			 ".previous\n"					      \
			 LLL_STUB_UNWIND_INFO_4				      \
			 "18:"						      \
			 : "=m" (futex), "=&a" (ignore), "=&c" (ignore2)      \
			 : "i" (FUTEX_WAITERS), "m" (futex),		      \
			   "g" ((int) (private))			      \
			 : "memory");					      \
    })


#define lll_robust_dead(futex, private) \
  (void)								      \
    ({ int __ignore;							      \
       register int _nr asm ("edx") = 1;				      \
       __asm __volatile (LOCK_INSTR "orl %5, (%2)\n\t"			      \
			 LLL_EBX_LOAD					      \
			 LLL_ENTER_KERNEL				      \
			 LLL_EBX_LOAD					      \
			 : "=a" (__ignore)				      \
			 : "0" (SYS_futex), LLL_EBX_REG (&(futex)),	      \
			   "c" (__lll_private_flag (FUTEX_WAKE, private)),    \
			   "d" (_nr), "i" (FUTEX_OWNER_DIED),		      \
			   "i" (offsetof (tcbhead_t, sysinfo)));	      \
    })

#define lll_islocked(futex) \
  (futex != LLL_LOCK_INITIALIZER)

/* The kernel notifies a process which uses CLONE_CHILD_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.  */
#define lll_wait_tid(tid) \
  do {									      \
    int __ignore;							      \
    register __typeof (tid) _tid asm ("edx") = (tid);			      \
    if (_tid != 0)							      \
      __asm __volatile (LLL_EBX_LOAD					      \
			"1:\tmovl %1, %%eax\n\t"			      \
			LLL_ENTER_KERNEL				      \
			"cmpl $0, (%%ebx)\n\t"				      \
			"jne 1b\n\t"					      \
			LLL_EBX_LOAD					      \
			: "=&a" (__ignore)				      \
			: "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0),	      \
			  "c" (FUTEX_WAIT), "d" (_tid),			      \
			  "i" (offsetof (tcbhead_t, sysinfo))		      \
			: "memory");					      \
  } 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->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)	      \
	  __result = EINVAL;						      \
	else								      \
	  __result = __lll_timedwait_tid (&tid, abstime);		      \
      }									      \
    __result; })

extern int __lll_lock_elision (int *futex, short *adapt_count, int private)
  attribute_hidden;

extern int __lll_unlock_elision(int *lock, int private)
  attribute_hidden;

extern int __lll_trylock_elision(int *lock, short *adapt_count)
  attribute_hidden;

#define lll_lock_elision(futex, adapt_count, private) \
  __lll_lock_elision (&(futex), &(adapt_count), private)
#define lll_unlock_elision(futex, private) \
  __lll_unlock_elision (&(futex), private)
#define lll_trylock_elision(futex, adapt_count) \
  __lll_trylock_elision(&(futex), &(adapt_count))

#endif  /* !__ASSEMBLER__ */

#endif	/* lowlevellock.h */