/* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.   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>#include <ia64intrin.h>#include <atomic.h>#include <kernel-features.h>#define __NR_futex		1230#define FUTEX_WAIT		0#define FUTEX_WAKE		1#define FUTEX_REQUEUE		3#define FUTEX_CMP_REQUEUE	4#define FUTEX_WAKE_OP		5#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE	((4 << 24) | 1)#define FUTEX_LOCK_PI		6#define FUTEX_UNLOCK_PI		7#define FUTEX_TRYLOCK_PI	8#define FUTEX_PRIVATE_FLAG	128/* 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))								      \   : ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG)				      \	      & THREAD_GETMEM (THREAD_SELF, header.private_futex))))# endif	      #endif/* Delay in spinlock loop.  */#define BUSY_WAIT_NOP          asm ("hint @pause")#define lll_futex_wait(futex, val, private) \  lll_futex_timed_wait (futex, val, NULL, private)#define lll_futex_timed_wait(ftx, val, timespec, private)		\({									\   DO_INLINE_SYSCALL(futex, 4, (long) (ftx),				\		     __lll_private_flag (FUTEX_WAIT, private),		\		     (int) (val), (long) (timespec));			\   _r10 == -1 ? -_retval : _retval;					\})#define lll_futex_wake(ftx, nr, private)				\({									\   DO_INLINE_SYSCALL(futex, 3, (long) (ftx),				\		     __lll_private_flag (FUTEX_WAKE, private),		\		     (int) (nr));					\   _r10 == -1 ? -_retval : _retval;					\})#define lll_robust_dead(futexv, private)				\do									\  {									\    int *__futexp = &(futexv);						\    atomic_or (__futexp, FUTEX_OWNER_DIED);				\    DO_INLINE_SYSCALL(futex, 3, (long) __futexp,			\		      __lll_private_flag (FUTEX_WAKE, private), 1);	\  }									\while (0)/* Returns non-zero if error happened, zero if success.  */#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val, private)	     \({									     \   DO_INLINE_SYSCALL(futex, 6, (long) (ftx),				     \		     __lll_private_flag (FUTEX_CMP_REQUEUE, private),	     \		     (int) (nr_wake), (int) (nr_move), (long) (mutex),	     \		     (int) val);					     \   _r10 == -1;								     \})/* Returns non-zero if error happened, zero if success.  */#define lll_futex_wake_unlock(ftx, nr_wake, nr_wake2, ftx2, private)	     \({									     \   DO_INLINE_SYSCALL(futex, 6, (long) (ftx),				     \		     __lll_private_flag (FUTEX_WAKE_OP, private),	     \		     (int) (nr_wake), (int) (nr_wake2), (long) (ftx2),	     \		     FUTEX_OP_CLEAR_WAKE_IF_GT_ONE);			     \   _r10 == -1;								     \})#define __lll_trylock(futex) \  (atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0)#define lll_trylock(futex) __lll_trylock (&(futex))#define __lll_robust_trylock(futex, id) \  (atomic_compare_and_exchange_val_acq (futex, id, 0) != 0)#define lll_robust_trylock(futex, id) \  __lll_robust_trylock (&(futex), id)#define __lll_cond_trylock(futex) \  (atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex))extern void __lll_lock_wait_private (int *futex) attribute_hidden;extern void __lll_lock_wait (int *futex, int private) attribute_hidden;extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden;#define __lll_lock(futex, private)					      \  ((void) ({								      \    int *__futex = (futex);						      \    if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex,      \								1, 0), 0))    \      {									      \	if (__builtin_constant_p (private) && (private) == LLL_PRIVATE)	      \	  __lll_lock_wait_private (__futex);				      \	else								      \	  __lll_lock_wait (__futex, private);				      \      }									      \  }))#define lll_lock(futex, private) __lll_lock (&(futex), private)#define __lll_robust_lock(futex, id, private)				      \  ({									      \    int *__futex = (futex);						      \    int __val = 0;							      \									      \    if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id,  \								0), 0))	      \      __val = __lll_robust_lock_wait (__futex, private);		      \    __val;								      \  })#define lll_robust_lock(futex, id, private) \  __lll_robust_lock (&(futex), id, private)#define __lll_cond_lock(futex, private)					      \  ((void) ({								      \    int *__futex = (futex);						      \    if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, 2,   \								0), 0))	      \      __lll_lock_wait (__futex, private);				      \  }))#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)#define __lll_robust_cond_lock(futex, id, private)			      \  ({									      \    int *__futex = (futex);						      \    int __val = 0;							      \    int __id = (id) | FUTEX_WAITERS;					      \									      \    if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex,      \								__id, 0), 0)) \      __val = __lll_robust_lock_wait (__futex, private);		      \    __val;								      \  })#define lll_robust_cond_lock(futex, id, private) \  __lll_robust_cond_lock (&(futex), id, private)extern int __lll_timedlock_wait (int *futex, const struct timespec *,				 int private) attribute_hidden;extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *,					int private) attribute_hidden;#define __lll_timedlock(futex, abstime, private)			      \  ({									      \     int *__futex = (futex);						      \     int __val = 0;							      \									      \     if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, 1,  \								 0), 0))      \       __val = __lll_timedlock_wait (__futex, abstime, private);	      \     __val;								      \  })#define lll_timedlock(futex, abstime, private) \  __lll_timedlock (&(futex), abstime, private)#define __lll_robust_timedlock(futex, abstime, id, private)		      \  ({									      \    int *__futex = (futex);						      \    int __val = 0;							      \									      \    if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id,  \								0), 0))	      \      __val = __lll_robust_timedlock_wait (__futex, abstime, private);	      \    __val;								      \  })#define lll_robust_timedlock(futex, abstime, id, private) \  __lll_robust_timedlock (&(futex), abstime, id, private)#define __lll_unlock(futex, private)					      \  ((void) ({								      \    int *__futex = (futex);						      \    int __val = atomic_exchange_rel (__futex, 0);			      \									      \    if (__builtin_expect (__val > 1, 0))				      \      lll_futex_wake (__futex, 1, private);				      \  }))#define lll_unlock(futex, private) __lll_unlock(&(futex), private)#define __lll_robust_unlock(futex, private)				      \  ((void) ({								      \    int *__futex = (futex);						      \    int __val = atomic_exchange_rel (__futex, 0);			      \									      \    if (__builtin_expect (__val & FUTEX_WAITERS, 0))			      \      lll_futex_wake (__futex, 1, private);				      \  }))#define lll_robust_unlock(futex, private) \  __lll_robust_unlock(&(futex), private)#define lll_islocked(futex) \  (futex != 0)/* Initializers for lock.  */#define LLL_LOCK_INITIALIZER		(0)#define LLL_LOCK_INITIALIZER_LOCKED	(1)/* 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.	*/#define lll_wait_tid(tid) \  do							\    {							\      __typeof (tid) __tid;				\      while ((__tid = (tid)) != 0)			\	lll_futex_wait (&(tid), __tid, LLL_SHARED);	\    }							\  while (0)extern int __lll_timedwait_tid (int *, const struct timespec *)     attribute_hidden;#define lll_timedwait_tid(tid, abstime) \  ({							\    int __res = 0;					\    if ((tid) != 0)					\      __res = __lll_timedwait_tid (&(tid), (abstime));	\    __res;						\  })#endif	/* lowlevellock.h */