[thirdparty/glibc.git] / nptl / sysdeps / unix / sysv / linux / s390 / lowlevellock.h

/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Martin Schwidefsky <schwidefsky@de.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>

#define SYS_futex		238
#define FUTEX_WAIT		0
#define FUTEX_WAKE		1
#define FUTEX_REQUEUE		3

/* Initializer for compatibility lock.	*/
#define LLL_MUTEX_LOCK_INITIALIZER (0)

#define lll_futex_wait(futex, val) \
  ({									      \
     register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
     register unsigned long int __r3 asm ("3") = FUTEX_WAIT;		      \
     register unsigned long int __r4 asm ("4") = (unsigned long int) (val);   \
     register unsigned long int __r5 asm ("5") = 0ul;			      \
     register unsigned long __result asm ("2");				      \
									      \
    __asm __volatile ("svc %b1"						      \
		      : "=d" (__result)					      \
		      : "i" (SYS_futex), "0" (__r2), "d" (__r3),	      \
			"d" (__r4), "d" (__r5)				      \
		      : "cc", "memory" );				      \
    __result;								      \
  })


#define lll_futex_timed_wait(futex, val, timespec) \
  ({									      \
    register unsigned long int __r2 asm ("2") = (unsigned long int) (futex);  \
    register unsigned long int __r3 asm ("3") = FUTEX_WAIT;		      \
    register unsigned long int __r4 asm ("4") = (unsigned long int) (val);    \
    register unsigned long int __r5 asm ("5") = (unsigned long int)(timespec);\
    register unsigned long int __result asm ("2");			      \
									      \
    __asm __volatile ("svc %b1"						      \
		      : "=d" (__result)					      \
		      : "i" (SYS_futex), "0" (__r2), "d" (__r3),	      \
			"d" (__r4), "d" (__r5)				      \
		      : "cc", "memory" );				      \
    __result;								      \
  })


#define lll_futex_wake(futex, nr) \
  ({									      \
    register unsigned long int __r2 asm ("2") = (unsigned long int) (futex);  \
    register unsigned long int __r3 asm ("3") = FUTEX_WAKE;		      \
    register unsigned long int __r4 asm ("4") = (unsigned long int) (nr);     \
    register unsigned long int __result asm ("2");			      \
									      \
    __asm __volatile ("svc %b1"						      \
		      : "=d" (__result)					      \
		      : "i" (SYS_futex), "0" (__r2), "d" (__r3), "d" (__r4)   \
		      : "cc", "memory" );				      \
    __result;								      \
  })


#define lll_futex_requeue(futex, nr_wake, nr_move, mutex) \
  ({									      \
     register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
     register unsigned long int __r3 asm ("3") = FUTEX_REQUEUE;		      \
     register unsigned long int __r4 asm ("4") = (long int) (nr_wake);	      \
     register unsigned long int __r5 asm ("5") = (long int) (nr_move);	      \
     register unsigned long int __r6 asm ("6") = (unsigned long int) (mutex); \
     register unsigned long __result asm ("2");				      \
									      \
    __asm __volatile ("svc %b1"						      \
		      : "=d" (__result)					      \
		      : "i" (SYS_futex), "0" (__r2), "d" (__r3),	      \
			"d" (__r4), "d" (__r5), "d" (__r6)		      \
		      : "cc", "memory" );				      \
    __result;								      \
  })


#define lll_compare_and_swap(futex, oldval, newval, operation) \
  do {									      \
    __typeof (futex) __futex = (futex);					      \
    __asm __volatile ("	  l   %1,%0\n"					      \
		      "0: " operation "\n"				      \
		      "	  cs  %1,%2,%0\n"				      \
		      "	  jl  0b\n"					      \
		      "1:"						      \
		      : "=Q" (*__futex), "=&d" (oldval), "=&d" (newval)	      \
		      : "m" (*__futex) : "cc" );			      \
  } while (0)


static inline int
__attribute__ ((always_inline))
__lll_mutex_trylock (int *futex)
{
    unsigned int old;

    __asm __volatile ("cs %0,%3,%1"
		       : "=d" (old), "=Q" (*futex)
		       : "0" (0), "d" (1), "m" (*futex) : "cc" );
    return old != 0;
}
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))


extern void ___lll_mutex_lock (int *, int) attribute_hidden;


static inline void
__attribute__ ((always_inline))
__lll_mutex_lock (int *futex)
{
  int oldval;
  int newval;

  lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1");
  if (oldval > 0)
    ___lll_mutex_lock (futex, newval);
}
#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))


extern int ___lll_mutex_timedlock (int *, const struct timespec *, int)
  attribute_hidden;


static inline int
__attribute__ ((always_inline))
__lll_mutex_timedlock (int *futex, struct timespec *abstime)
{
  int oldval;
  int newval;
  int result = 0;

  lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1");
  if (oldval > 0)
    result = ___lll_mutex_timedlock (futex, abstime, newval);

  return result;
}
#define lll_mutex_timedlock(futex, abstime) \
  __lll_mutex_timedlock (&(futex), abstime)


static inline void
__attribute__ ((always_inline))
__lll_mutex_unlock (int *futex)
{
  int oldval;
  int newval;

  lll_compare_and_swap (futex, oldval, newval, "slr %2,%2");
  if (oldval > 1)
    lll_futex_wake (futex, 1);
}
#define lll_mutex_unlock(futex) \
  __lll_mutex_unlock(&(futex))

#define lll_mutex_unlock_force(futex) \
  lll_futex_wake (&(futex), 1)

#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_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 */


static inline int
__attribute__ ((always_inline))
__lll_trylock (int *futex)
{
  unsigned int old;

  __asm __volatile ("cs %0,%3,%1"
		    : "=d" (old), "=Q" (*futex)
		    : "0" (1), "d" (0), "m" (*futex) : "cc" );
  return old != 1;
}
#define lll_trylock(futex) __lll_trylock (&(futex))


extern void ___lll_lock (int *, int) attribute_hidden;

static inline void
__attribute__ ((always_inline))
__lll_lock (int *futex)
{
  int oldval;
  int newval;

  lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,-1");
  if (newval < 0)
    ___lll_lock (futex, newval);
}
#define lll_lock(futex) __lll_lock (&(futex))


static inline void
__attribute__ ((always_inline))
__lll_unlock (int *futex)
{
  int oldval;
  int newval;

  lll_compare_and_swap (futex, oldval, newval, "lhi %2,1");
  if (oldval < 0)
    lll_futex_wake (futex, 1);
}
#define lll_unlock(futex) __lll_unlock(&(futex))


#define lll_islocked(futex) \
  (futex != 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.	*/
static inline void
__attribute__ ((always_inline))
__lll_wait_tid (int *ptid)
{
  int tid;

  while ((tid = *ptid) != 0)
    lll_futex_wait (ptid, tid);
}
#define lll_wait_tid(tid) __lll_wait_tid(&(tid))


extern int ___lll_timedwait_tid (int *, const struct timespec *)
     attribute_hidden;
static inline int
__attribute__ ((always_inline))
__lll_timedwait_tid (int *ptid, const struct timespec *abstime)
{
  if (*ptid == 0)
    return 0;

  return ___lll_timedwait_tid (ptid, abstime);
}
#define lll_timedwait_tid(tid, abstime) __lll_timedwait_tid (&(tid), abstime)


/* Conditional variable handling.  */

extern void __lll_cond_wait (pthread_cond_t *cond)
     attribute_hidden;
extern int __lll_cond_timedwait (pthread_cond_t *cond,
				 const struct timespec *abstime)
     attribute_hidden;
extern void __lll_cond_wake (pthread_cond_t *cond)
     attribute_hidden;
extern void __lll_cond_broadcast (pthread_cond_t *cond)
     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 */
Commit	Line	Data
a88c9263 UD	1	/* Copyright (C) 2003 Free Software Foundation, Inc.
	2	This file is part of the GNU C Library.
	3	Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, write to the Free
	17	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	18	02111-1307 USA. */
	19
	20	#ifndef _LOWLEVELLOCK_H
	21	#define _LOWLEVELLOCK_H 1
	22
	23	#include <time.h>
	24	#include <sys/param.h>
	25	#include <bits/pthreadtypes.h>
	26
	27	#define SYS_futex 238
	28	#define FUTEX_WAIT 0
	29	#define FUTEX_WAKE 1
284bdc42	30	#define FUTEX_REQUEUE 3
a88c9263 UD	31
	32	/* Initializer for compatibility lock. */
	33	#define LLL_MUTEX_LOCK_INITIALIZER (0)
	34
	35	#define lll_futex_wait(futex, val) \
	36	({ \
	37	register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
	38	register unsigned long int __r3 asm ("3") = FUTEX_WAIT; \
	39	register unsigned long int __r4 asm ("4") = (unsigned long int) (val); \
	40	register unsigned long int __r5 asm ("5") = 0ul; \
	41	register unsigned long __result asm ("2"); \
	42	\
	43	__asm __volatile ("svc %b1" \
	44	: "=d" (__result) \
	45	: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
	46	"d" (__r4), "d" (__r5) \
	47	: "cc", "memory" ); \
	48	__result; \
	49	})
	50
	51
	52	#define lll_futex_timed_wait(futex, val, timespec) \
	53	({ \
	54	register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
	55	register unsigned long int __r3 asm ("3") = FUTEX_WAIT; \
	56	register unsigned long int __r4 asm ("4") = (unsigned long int) (val); \
	57	register unsigned long int __r5 asm ("5") = (unsigned long int)(timespec);\
	58	register unsigned long int __result asm ("2"); \
	59	\
	60	__asm __volatile ("svc %b1" \
	61	: "=d" (__result) \
	62	: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
	63	"d" (__r4), "d" (__r5) \
	64	: "cc", "memory" ); \
	65	__result; \
	66	})
	67
	68
	69	#define lll_futex_wake(futex, nr) \
	70	({ \
	71	register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
	72	register unsigned long int __r3 asm ("3") = FUTEX_WAKE; \
	73	register unsigned long int __r4 asm ("4") = (unsigned long int) (nr); \
	74	register unsigned long int __result asm ("2"); \
	75	\
	76	__asm __volatile ("svc %b1" \
	77	: "=d" (__result) \
	78	: "i" (SYS_futex), "0" (__r2), "d" (__r3), "d" (__r4) \
	79	: "cc", "memory" ); \
	80	__result; \
	81	})
	82
	83
284bdc42 UD	84	#define lll_futex_requeue(futex, nr_wake, nr_move, mutex) \
	85	({ \
	86	register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \
	87	register unsigned long int __r3 asm ("3") = FUTEX_REQUEUE; \
	88	register unsigned long int __r4 asm ("4") = (long int) (nr_wake); \
	89	register unsigned long int __r5 asm ("5") = (long int) (nr_move); \
	90	register unsigned long int __r6 asm ("6") = (unsigned long int) (mutex); \
	91	register unsigned long __result asm ("2"); \
	92	\
	93	__asm __volatile ("svc %b1" \
	94	: "=d" (__result) \
	95	: "i" (SYS_futex), "0" (__r2), "d" (__r3), \
	96	"d" (__r4), "d" (__r5), "d" (__r6) \
	97	: "cc", "memory" ); \
	98	__result; \
	99	})
	100
	101
a88c9263 UD	102	#define lll_compare_and_swap(futex, oldval, newval, operation) \
	103	do { \
	104	__typeof (futex) __futex = (futex); \
	105	__asm __volatile (" l %1,%0\n" \
	106	"0: " operation "\n" \
	107	" cs %1,%2,%0\n" \
	108	" jl 0b\n" \
	109	"1:" \
	110	: "=Q" (*__futex), "=&d" (oldval), "=&d" (newval) \
	111	: "m" (*__futex) : "cc" ); \
	112	} while (0)
	113
	114
	115	static inline int
	116	__attribute__ ((always_inline))
	117	__lll_mutex_trylock (int *futex)
	118	{
	119	unsigned int old;
	120
	121	__asm __volatile ("cs %0,%3,%1"
	122	: "=d" (old), "=Q" (*futex)
	123	: "0" (0), "d" (1), "m" (*futex) : "cc" );
	124	return old != 0;
	125	}
	126	#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
	127
	128
	129	extern void ___lll_mutex_lock (int *, int) attribute_hidden;
	130
	131
	132	static inline void
	133	__attribute__ ((always_inline))
	134	__lll_mutex_lock (int *futex)
	135	{
	136	int oldval;
	137	int newval;
	138
	139	lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1");
	140	if (oldval > 0)
	141	___lll_mutex_lock (futex, newval);
	142	}
	143	#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
	144
	145
	146	extern int ___lll_mutex_timedlock (int , const struct timespec , int)
	147	attribute_hidden;
	148
	149
	150	static inline int
	151	__attribute__ ((always_inline))
	152	__lll_mutex_timedlock (int futex, struct timespec abstime)
	153	{
	154	int oldval;
	155	int newval;
	156	int result = 0;
	157
	158	lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1");
	159	if (oldval > 0)
	160	result = ___lll_mutex_timedlock (futex, abstime, newval);
	161
	162	return result;
	163	}
	164	#define lll_mutex_timedlock(futex, abstime) \
	165	__lll_mutex_timedlock (&(futex), abstime)
166
167
168	static inline void
169	__attribute__ ((always_inline))
170	__lll_mutex_unlock (int *futex)
171	{
172	int oldval;
173	int newval;
174
175	lll_compare_and_swap (futex, oldval, newval, "slr %2,%2");
176	if (oldval > 1)
177	lll_futex_wake (futex, 1);
178	}
284bdc42 UD	179	#define lll_mutex_unlock(futex) \
	180	__lll_mutex_unlock(&(futex))
	181
	182	#define lll_mutex_unlock_force(futex) \
	183	lll_futex_wake (&(futex), 1)
a88c9263 UD	184
	185	#define lll_mutex_islocked(futex) \
	186	(futex != 0)
	187
	188
	189	/* We have a separate internal lock implementation which is not tied
	190	to binary compatibility. */
	191
	192	/* Type for lock object. */
	193	typedef int lll_lock_t;
	194
	195	/* Initializers for lock. */
	196	#define LLL_LOCK_INITIALIZER (1)
	197	#define LLL_LOCK_INITIALIZER_LOCKED (0)
	198
	199
	200	extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
	201
	202	/* The states of a lock are:
	203	1 - untaken
	204	0 - taken by one user
	205	<0 - taken by more users */
	206
	207
	208	static inline int
	209	__attribute__ ((always_inline))
	210	__lll_trylock (int *futex)
	211	{
	212	unsigned int old;
	213
	214	__asm __volatile ("cs %0,%3,%1"
	215	: "=d" (old), "=Q" (*futex)
	216	: "0" (1), "d" (0), "m" (*futex) : "cc" );
	217	return old != 1;
	218	}
	219	#define lll_trylock(futex) __lll_trylock (&(futex))
	220
	221
	222	extern void ___lll_lock (int *, int) attribute_hidden;
	223
	224	static inline void
	225	__attribute__ ((always_inline))
	226	__lll_lock (int *futex)
	227	{
	228	int oldval;
	229	int newval;
	230
	231	lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,-1");
	232	if (newval < 0)
	233	___lll_lock (futex, newval);
	234	}
	235	#define lll_lock(futex) __lll_lock (&(futex))
	236
	237
	238	static inline void
	239	__attribute__ ((always_inline))
	240	__lll_unlock (int *futex)
	241	{
	242	int oldval;
	243	int newval;
	244
	245	lll_compare_and_swap (futex, oldval, newval, "lhi %2,1");
	246	if (oldval < 0)
	247	lll_futex_wake (futex, 1);
248	}
249	#define lll_unlock(futex) __lll_unlock(&(futex))
250
251
252	#define lll_islocked(futex) \
253	(futex != 1)
254
255
256	/* The kernel notifies a process with uses CLONE_CLEARTID via futex
257	wakeup when the clone terminates. The memory location contains the
258	thread ID while the clone is running and is reset to zero
259	afterwards. */
260	static inline void
261	__attribute__ ((always_inline))
262	__lll_wait_tid (int *ptid)
263	{
264	int tid;
265
266	while ((tid = *ptid) != 0)
267	lll_futex_wait (ptid, tid);
268	}
269	#define lll_wait_tid(tid) __lll_wait_tid(&(tid))
270
271
272	extern int ___lll_timedwait_tid (int , const struct timespec )
273	attribute_hidden;
274	static inline int
275	__attribute__ ((always_inline))
276	__lll_timedwait_tid (int ptid, const struct timespec abstime)
277	{
278	if (*ptid == 0)
279	return 0;
280
281	return ___lll_timedwait_tid (ptid, abstime);
282	}
283	#define lll_timedwait_tid(tid, abstime) __lll_timedwait_tid (&(tid), abstime)
284
285
a88c9263 UD	286	/* Conditional variable handling. */
	287
	288	extern void __lll_cond_wait (pthread_cond_t *cond)
	289	attribute_hidden;
	290	extern int __lll_cond_timedwait (pthread_cond_t *cond,
	291	const struct timespec *abstime)
	292	attribute_hidden;
	293	extern void __lll_cond_wake (pthread_cond_t *cond)
	294	attribute_hidden;
	295	extern void __lll_cond_broadcast (pthread_cond_t *cond)
	296	attribute_hidden;
	297
	298	#define lll_cond_wait(cond) \
	299	__lll_cond_wait (cond)
	300	#define lll_cond_timedwait(cond, abstime) \
	301	__lll_cond_timedwait (cond, abstime)
	302	#define lll_cond_wake(cond) \
	303	__lll_cond_wake (cond)
	304	#define lll_cond_broadcast(cond) \
	305	__lll_cond_broadcast (cond)
	306
	307	#endif /* lowlevellock.h */