nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h - nest-cam/v366/glibc - Git at Google

 /* Copyright (C) 2003, 2004, 2006-2008, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Paul Mackerras <paulus@au.ibm.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 <atomic.h>
 #include <kernel-features.h>

 #ifndef __NR_futex
 # define __NR_futex		221
 #endif
 #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_WAIT_BITSET	9
 #define FUTEX_WAKE_BITSET	10
 #define FUTEX_PRIVATE_FLAG	128
 #define FUTEX_CLOCK_REALTIME	256

 #define FUTEX_BITSET_MATCH_ANY	0xffffffff

 /* 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

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

 #define lll_futex_timed_wait(futexp, val, timespec, private) \
   ({									      \
     INTERNAL_SYSCALL_DECL (__err);					      \
     long int __ret;							      \
 									      \
     __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp),		      \
 			      __lll_private_flag (FUTEX_WAIT, private),	      \
 			      (val), (timespec));			      \
     INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret;		      \
   })

 #define lll_futex_wake(futexp, nr, private) \
   ({									      \
     INTERNAL_SYSCALL_DECL (__err);					      \
     long int __ret;							      \
 									      \
     __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp),		      \
 			      __lll_private_flag (FUTEX_WAKE, private),	      \
 			      (nr), 0);					      \
     INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret;		      \
   })

 #define lll_robust_dead(futexv, private) \
   do									      \
     {									      \
       INTERNAL_SYSCALL_DECL (__err);					      \
       int *__futexp = &(futexv);					      \
 									      \
       atomic_or (__futexp, FUTEX_OWNER_DIED);				      \
       INTERNAL_SYSCALL (futex, __err, 4, __futexp,			      \
 			__lll_private_flag (FUTEX_WAKE, private), 1, 0);      \
     }									      \
   while (0)

 /* Returns non-zero if error happened, zero if success.  */
 #define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
   ({									      \
     INTERNAL_SYSCALL_DECL (__err);					      \
     long int __ret;							      \
 									      \
     __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp),		      \
 			      __lll_private_flag (FUTEX_CMP_REQUEUE, private),\
 			      (nr_wake), (nr_move), (mutex), (val));	      \
     INTERNAL_SYSCALL_ERROR_P (__ret, __err);				      \
   })

 /* Returns non-zero if error happened, zero if success.  */
 #define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \
   ({									      \
     INTERNAL_SYSCALL_DECL (__err);					      \
     long int __ret;							      \
 									      \
     __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp),		      \
 			      __lll_private_flag (FUTEX_WAKE_OP, private),    \
 			      (nr_wake), (nr_wake2), (futexp2),		      \
 			      FUTEX_OP_CLEAR_WAKE_IF_GT_ONE);		      \
     INTERNAL_SYSCALL_ERROR_P (__ret, __err);				      \
   })


 #ifdef UP
 # define __lll_acq_instr	""
 # define __lll_rel_instr	""
 #else
 # define __lll_acq_instr	"isync"
 # ifdef _ARCH_PWR4
 /*
  * Newer powerpc64 processors support the new "light weight" sync (lwsync)
  * So if the build is using -mcpu=[power4,power5,power5+,970] we can
  * safely use lwsync.
  */
 #  define __lll_rel_instr	"lwsync"
 # else
 /*
  * Older powerpc32 processors don't support the new "light weight"
  * sync (lwsync).  So the only safe option is to use normal sync
  * for all powerpc32 applications.
  */
 #  define __lll_rel_instr	"sync"
 # endif
 #endif

 /* Set *futex to ID if it is 0, atomically.  Returns the old value */
 #define __lll_robust_trylock(futex, id) \
   ({ int __val;								      \
      __asm __volatile ("1:	lwarx	%0,0,%2" MUTEX_HINT_ACQ "\n"	      \
 		       "	cmpwi	0,%0,0\n"			      \
 		       "	bne	2f\n"				      \
 		       "	stwcx.	%3,0,%2\n"			      \
 		       "	bne-	1b\n"				      \
 		       "2:	" __lll_acq_instr			      \
 		       : "=&r" (__val), "=m" (*futex)			      \
 		       : "r" (futex), "r" (id), "m" (*futex)		      \
 		       : "cr0", "memory");				      \
      __val;								      \
   })

 #define lll_robust_trylock(lock, id) __lll_robust_trylock (&(lock), id)

 /* Set *futex to 1 if it is 0, atomically.  Returns the old value */
 #define __lll_trylock(futex) __lll_robust_trylock (futex, 1)

 #define lll_trylock(lock)	__lll_trylock (&(lock))

 /* Set *futex to 2 if it is 0, atomically.  Returns the old value */
 #define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2)

 #define lll_cond_trylock(lock)	__lll_cond_trylock (&(lock))


 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(lock, private) \
   (void) ({								      \
     int *__futex = &(lock);						      \
     if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
 			  0) != 0)					      \
       {									      \
 	if (__builtin_constant_p (private) && (private) == LLL_PRIVATE)	      \
 	  __lll_lock_wait_private (__futex);				      \
 	else								      \
 	  __lll_lock_wait (__futex, private);				      \
       }									      \
   })

 #define lll_robust_lock(lock, id, private) \
   ({									      \
     int *__futex = &(lock);						      \
     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_cond_lock(lock, private) \
   (void) ({								      \
     int *__futex = &(lock);						      \
     if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
 			  0) != 0)					      \
       __lll_lock_wait (__futex, private);				      \
   })

 #define lll_robust_cond_lock(lock, id, private) \
   ({									      \
     int *__futex = &(lock);						      \
     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;								      \
   })


 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(lock, abstime, private) \
   ({									      \
     int *__futex = &(lock);						      \
     int __val = 0;							      \
     if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
 			  0) != 0)					      \
       __val = __lll_timedlock_wait (__futex, abstime, private);		      \
     __val;								      \
   })

 #define lll_robust_timedlock(lock, abstime, id, private) \
   ({									      \
     int *__futex = &(lock);						      \
     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_unlock(lock, private) \
   ((void) ({								      \
     int *__futex = &(lock);						      \
     int __val = atomic_exchange_rel (__futex, 0);			      \
     if (__builtin_expect (__val > 1, 0))				      \
       lll_futex_wake (__futex, 1, private);				      \
   }))

 #define lll_robust_unlock(lock, private) \
   ((void) ({								      \
     int *__futex = &(lock);						      \
     int __val = atomic_exchange_rel (__futex, 0);			      \
     if (__builtin_expect (__val & FUTEX_WAITERS, 0))			      \
       lll_futex_wake (__futex, 1, private);				      \
   }))

 #define lll_islocked(futex) \
   (futex != 0)


 /* Initializers for lock.  */
 #define LLL_LOCK_INITIALIZER		(0)
 #define LLL_LOCK_INITIALIZER_LOCKED	(1)

 /* The states of a lock are:
     0  -  untaken
     1  -  taken by one user
    >1  -  taken by more users */

 /* The kernel notifies a process which 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 */
	/* Copyright (C) 2003, 2004, 2006-2008, 2009 Free Software Foundation, Inc.
	This file is part of the GNU C Library.
	Contributed by Paul Mackerras <paulus@au.ibm.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 <atomic.h>
	#include <kernel-features.h>

	#ifndef __NR_futex
	# define __NR_futex 221
	#endif
	#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_WAIT_BITSET 9
	#define FUTEX_WAKE_BITSET 10
	#define FUTEX_PRIVATE_FLAG 128
	#define FUTEX_CLOCK_REALTIME 256

	#define FUTEX_BITSET_MATCH_ANY 0xffffffff

	/* 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

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

	#define lll_futex_timed_wait(futexp, val, timespec, private) \
	({ \
	INTERNAL_SYSCALL_DECL (__err); \
	long int __ret; \
	\
	__ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
	__lll_private_flag (FUTEX_WAIT, private), \
	(val), (timespec)); \
	INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
	})

	#define lll_futex_wake(futexp, nr, private) \
	({ \
	INTERNAL_SYSCALL_DECL (__err); \
	long int __ret; \
	\
	__ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
	__lll_private_flag (FUTEX_WAKE, private), \
	(nr), 0); \
	INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
	})

	#define lll_robust_dead(futexv, private) \
	do \
	{ \
	INTERNAL_SYSCALL_DECL (__err); \
	int *__futexp = &(futexv); \
	\
	atomic_or (__futexp, FUTEX_OWNER_DIED); \
	INTERNAL_SYSCALL (futex, __err, 4, __futexp, \
	__lll_private_flag (FUTEX_WAKE, private), 1, 0); \
	} \
	while (0)

	/* Returns non-zero if error happened, zero if success. */
	#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
	({ \
	INTERNAL_SYSCALL_DECL (__err); \
	long int __ret; \
	\
	__ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
	__lll_private_flag (FUTEX_CMP_REQUEUE, private),\
	(nr_wake), (nr_move), (mutex), (val)); \
	INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
	})

	/* Returns non-zero if error happened, zero if success. */
	#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \
	({ \
	INTERNAL_SYSCALL_DECL (__err); \
	long int __ret; \
	\
	__ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
	__lll_private_flag (FUTEX_WAKE_OP, private), \
	(nr_wake), (nr_wake2), (futexp2), \
	FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
	INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
	})


	#ifdef UP
	# define __lll_acq_instr ""
	# define __lll_rel_instr ""
	#else
	# define __lll_acq_instr "isync"
	# ifdef _ARCH_PWR4
	/*
	* Newer powerpc64 processors support the new "light weight" sync (lwsync)
	* So if the build is using -mcpu=[power4,power5,power5+,970] we can
	* safely use lwsync.
	*/
	# define __lll_rel_instr "lwsync"
	# else
	/*
	* Older powerpc32 processors don't support the new "light weight"
	* sync (lwsync). So the only safe option is to use normal sync
	* for all powerpc32 applications.
	*/
	# define __lll_rel_instr "sync"
	# endif
	#endif

	/* Set futex to ID if it is 0, atomically. Returns the old value /
	#define __lll_robust_trylock(futex, id) \
	({ int __val; \
	__asm __volatile ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \
	" cmpwi 0,%0,0\n" \
	" bne 2f\n" \
	" stwcx. %3,0,%2\n" \
	" bne- 1b\n" \
	"2: " __lll_acq_instr \
	: "=&r" (__val), "=m" (*futex) \
	: "r" (futex), "r" (id), "m" (*futex) \
	: "cr0", "memory"); \
	__val; \
	})

	#define lll_robust_trylock(lock, id) __lll_robust_trylock (&(lock), id)

	/* Set futex to 1 if it is 0, atomically. Returns the old value /
	#define __lll_trylock(futex) __lll_robust_trylock (futex, 1)

	#define lll_trylock(lock) __lll_trylock (&(lock))

	/* Set futex to 2 if it is 0, atomically. Returns the old value /
	#define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2)

	#define lll_cond_trylock(lock) __lll_cond_trylock (&(lock))


	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(lock, private) \
	(void) ({ \
	int *__futex = &(lock); \
	if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
	0) != 0) \
	{ \
	if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
	__lll_lock_wait_private (__futex); \
	else \
	__lll_lock_wait (__futex, private); \
	} \
	})

	#define lll_robust_lock(lock, id, private) \
	({ \
	int *__futex = &(lock); \
	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_cond_lock(lock, private) \
	(void) ({ \
	int *__futex = &(lock); \
	if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
	0) != 0) \
	__lll_lock_wait (__futex, private); \
	})

	#define lll_robust_cond_lock(lock, id, private) \
	({ \
	int *__futex = &(lock); \
	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; \
	})


	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(lock, abstime, private) \
	({ \
	int *__futex = &(lock); \
	int __val = 0; \
	if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
	0) != 0) \
	__val = __lll_timedlock_wait (__futex, abstime, private); \
	__val; \
	})

	#define lll_robust_timedlock(lock, abstime, id, private) \
	({ \
	int *__futex = &(lock); \
	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_unlock(lock, private) \
	((void) ({ \
	int *__futex = &(lock); \
	int __val = atomic_exchange_rel (__futex, 0); \
	if (__builtin_expect (__val > 1, 0)) \
	lll_futex_wake (__futex, 1, private); \
	}))

	#define lll_robust_unlock(lock, private) \
	((void) ({ \
	int *__futex = &(lock); \
	int __val = atomic_exchange_rel (__futex, 0); \
	if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \
	lll_futex_wake (__futex, 1, private); \
	}))

	#define lll_islocked(futex) \
	(futex != 0)


	/* Initializers for lock. */
	#define LLL_LOCK_INITIALIZER (0)
	#define LLL_LOCK_INITIALIZER_LOCKED (1)

	/* The states of a lock are:
	0 - untaken
	1 - taken by one user
	>1 - taken by more users */

	/* The kernel notifies a process which 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 */