nptl/sysdeps/unix/sysv/linux/sh/lowlevellock.h

   1 /* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _LOWLEVELLOCK_H
  20 #define _LOWLEVELLOCK_H 1
  21
  22 #include <time.h>
  23 #include <sys/param.h>
  24 #include <bits/pthreadtypes.h>
  25
  26 #define SYS_futex               240
  27 #define FUTEX_WAIT              0
  28 #define FUTEX_WAKE              1
  29
  30
  31 /* Initializer for compatibility lock.  */
  32 #define LLL_MUTEX_LOCK_INITIALIZER              (0)
  33 #define LLL_MUTEX_LOCK_INITIALIZER_LOCKED       (1)
  34 #define LLL_MUTEX_LOCK_INITIALIZER_WAITERS      (2)
  35
  36 extern int __lll_mutex_lock_wait (int val, int *__futex) attribute_hidden;
  37 extern int __lll_mutex_timedlock_wait (int val, int *__futex,
  38                                        const struct timespec *abstime)
  39      attribute_hidden;
  40 extern int __lll_mutex_unlock_wake (int *__futex) attribute_hidden;
  41
  42
  43 #define lll_mutex_trylock(futex) \
  44   ({ unsigned char __result; \
  45      __asm __volatile ("\
  46         .align 2\n\
  47         mova 1f,r0\n\
  48         nop\n\
  49         mov r15,r1\n\
  50         mov #-8,r15\n\
  51      0: mov.l @%1,r2\n\
  52         cmp/eq r2,%3\n\
  53         bf 1f\n\
  54         mov.l %2,@%1\n\
  55      1: mov r1,r15\n\
  56         mov #-1,%0\n\
  57         negc %0,%0"\
  58         : "=r" (__result) \
  59         : "r" (&(futex)), \
  60           "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), \
  61           "r" (LLL_MUTEX_LOCK_INITIALIZER) \
  62         : "r0", "r1", "r2", "t", "memory"); \
  63      __result; })
  64
  65 #define lll_mutex_cond_trylock(futex) \
  66   ({ unsigned char __result; \
  67      __asm __volatile ("\
  68         .align 2\n\
  69         mova 1f,r0\n\
  70         nop\n\
  71         mov r15,r1\n\
  72         mov #-8,r15\n\
  73      0: mov.l @%1,r2\n\
  74         cmp/eq r2,%3\n\
  75         bf 1f\n\
  76         mov.l %2,@%1\n\
  77      1: mov r1,r15\n\
  78         mov #-1,%0\n\
  79         negc %0,%0"\
  80         : "=r" (__result) \
  81         : "r" (&(futex)), \
  82           "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
  83           "r" (LLL_MUTEX_LOCK_INITIALIZER) \
  84         : "r0", "r1", "r2", "t", "memory"); \
  85      __result; })
  86
  87 #define lll_mutex_lock(futex) \
  88   (void) ({ int __result, val, *__futex = &(futex); \
  89             __asm __volatile ("\
  90                 .align 2\n\
  91                 mova 1f,r0\n\
  92                 nop\n\
  93                 mov r15,r1\n\
  94                 mov #-8,r15\n\
  95              0: mov.l @%2,%0\n\
  96                 tst %0,%0\n\
  97                 bf 1f\n\
  98                 mov.l %1,@%2\n\
  99              1: mov r1,r15"\
 100                 : "=&r" (__result) : "r" (1), "r" (__futex) \
 101                 : "r0", "r1", "t", "memory"); \
 102             if (__result) \
 103               __lll_mutex_lock_wait (__result, __futex); })
 104
 105 /* Special version of lll_mutex_lock which causes the unlock function to
 106    always wakeup waiters.  */
 107 #define lll_mutex_cond_lock(futex) \
 108   (void) ({ int __result, val, *__futex = &(futex); \
 109             __asm __volatile ("\
 110                 .align 2\n\
 111                 mova 1f,r0\n\
 112                 nop\n\
 113                 mov r15,r1\n\
 114                 mov #-8,r15\n\
 115              0: mov.l @%2,%0\n\
 116                 tst %0,%0\n\
 117                 bf 1f\n\
 118                 mov.l %1,@%2\n\
 119              1: mov r1,r15"\
 120                 : "=&r" (__result) : "r" (2), "r" (__futex) \
 121                 : "r0", "r1", "t", "memory"); \
 122             if (__result) \
 123               __lll_mutex_lock_wait (__result, __futex); })
 124
 125 #define lll_mutex_timedlock(futex, timeout) \
 126   ({ int __result, val, *__futex = &(futex); \
 127      __asm __volatile ("\
 128         .align 2\n\
 129         mova 1f,r0\n\
 130         nop\n\
 131         mov r15,r1\n\
 132         mov #-8,r15\n\
 133      0: mov.l @%2,%0\n\
 134         tst %0,%0\n\
 135         bf 1f\n\
 136         mov.l %1,@%2\n\
 137      1: mov r1,r15"\
 138         : "=&r" (__result) : "r" (1), "r" (__futex) \
 139         : "r0", "r1", "t", "memory"); \
 140     if (__result) \
 141       __result = __lll_mutex_timedlock_wait (__result, __futex, timeout); \
 142     __result; })
 143
 144 #define lll_mutex_unlock(futex) \
 145   (void) ({ int __result, *__futex = &(futex); \
 146             __asm __volatile ("\
 147                 .align 2\n\
 148                 mova 1f,r0\n\
 149                 mov r15,r1\n\
 150                 mov #-6,r15\n\
 151              0: mov.l @%1,%0\n\
 152                 add #-1,%0\n\
 153                 mov.l %0,@%1\n\
 154              1: mov r1,r15"\
 155                 : "=&r" (__result) : "r" (__futex) \
 156                 : "r0", "r1", "memory"); \
 157             if (__result) \
 158               __lll_mutex_unlock_wake (__futex); })
 159
 160 #define lll_mutex_islocked(futex) \
 161   (futex != 0)
 162
 163
 164 /* We have a separate internal lock implementation which is not tied
 165    to binary compatibility.  */
 166
 167 /* Type for lock object.  */
 168 typedef int lll_lock_t;
 169
 170 /* Initializers for lock.  */
 171 #define LLL_LOCK_INITIALIZER            (0)
 172 #define LLL_LOCK_INITIALIZER_LOCKED     (1)
 173
 174
 175 # ifdef NEED_SYSCALL_INST_PAD
 176 #  define SYSCALL_WITH_INST_PAD "\
 177         trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
 178 # else
 179 #  define SYSCALL_WITH_INST_PAD "\
 180         trapa #0x14"
 181 # endif
 182
 183 #define lll_futex_wait(futex, val) \
 184   do {                                                                        \
 185     int __ignore;                                                             \
 186     register unsigned long __r3 asm ("r3") = SYS_futex;                       \
 187     register unsigned long __r4 asm ("r4") = (unsigned long) (futex);         \
 188     register unsigned long __r5 asm ("r5") = FUTEX_WAIT;                      \
 189     register unsigned long __r6 asm ("r6") = (unsigned long) (val);           \
 190     register unsigned long __r7 asm ("r7") = 0;                               \
 191     __asm __volatile (SYSCALL_WITH_INST_PAD                                   \
 192                       : "=z" (__ignore)                                       \
 193                       : "r" (__r3), "r" (__r4), "r" (__r5),                   \
 194                         "r" (__r6), "r" (__r7)                                \
 195                       : "memory", "t");                                       \
 196   } while (0)
 197
 198
 199 #define lll_futex_wake(futex, nr) \
 200   do {                                                                        \
 201     int __ignore;                                                             \
 202     register unsigned long __r3 asm ("r3") = SYS_futex;                       \
 203     register unsigned long __r4 asm ("r4") = (unsigned long) (futex);         \
 204     register unsigned long __r5 asm ("r5") = FUTEX_WAKE;                      \
 205     register unsigned long __r6 asm ("r6") = (unsigned long) (nr);            \
 206     register unsigned long __r7 asm ("r7") = 0;                               \
 207     __asm __volatile (SYSCALL_WITH_INST_PAD                                   \
 208                       : "=z" (__ignore)                                       \
 209                       : "r" (__r3), "r" (__r4), "r" (__r5),                   \
 210                         "r" (__r6), "r" (__r7)                                \
 211                       : "memory", "t");                                       \
 212   } while (0)
 213
 214
 215 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
 216
 217
 218 /* The states of a lock are:
 219     0  -  untaken
 220     1  -  taken by one user
 221     2  -  taken by more users */
 222
 223 #define lll_trylock(futex) lll_mutex_trylock (futex)
 224 #define lll_lock(futex) lll_mutex_lock (futex)
 225 #define lll_unlock(futex) lll_mutex_unlock (futex)
 226
 227 #define lll_islocked(futex) \
 228   (futex != LLL_LOCK_INITIALIZER)
 229
 230
 231 /* The kernel notifies a process with uses CLONE_CLEARTID via futex
 232    wakeup when the clone terminates.  The memory location contains the
 233    thread ID while the clone is running and is reset to zero
 234    afterwards.  */
 235
 236 extern int __lll_wait_tid (int *tid) attribute_hidden;
 237 #define lll_wait_tid(tid) \
 238   do {                                                                        \
 239     __typeof (tid) *__tid = &(tid);                                           \
 240     while (*__tid != 0)                                                       \
 241       lll_futex_wait (__tid, *__tid);                                         \
 242   } while (0)
 243
 244 extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
 245      attribute_hidden;
 246 #define lll_timedwait_tid(tid, abstime) \
 247   ({                                                                          \
 248     int __result = 0;                                                         \
 249     if (tid != 0)                                                             \
 250       {                                                                       \
 251         if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)           \
 252           __result = EINVAL;                                                  \
 253         else                                                                  \
 254           __result = __lll_timedwait_tid (&tid, abstime);                     \
 255       }                                                                       \
 256     __result; })
 257
 258
 259 /* Conditional variable handling.  */
 260
 261 extern void __lll_cond_wait (pthread_cond_t *cond) attribute_hidden;
 262 extern int __lll_cond_timedwait (pthread_cond_t *cond,
 263                                  const struct timespec *abstime)
 264      attribute_hidden;
 265 extern void __lll_cond_wake (pthread_cond_t *cond) attribute_hidden;
 266 extern void __lll_cond_broadcast (pthread_cond_t *cond) attribute_hidden;
 267
 268
 269 #define lll_cond_wait(cond) \
 270   __lll_cond_wait (cond)
 271 #define lll_cond_timedwait(cond, abstime) \
 272   __lll_cond_timedwait (cond, abstime)
 273 #define lll_cond_wake(cond) \
 274   __lll_cond_wake (cond)
 275 #define lll_cond_broadcast(cond) \
 276   __lll_cond_broadcast (cond)
 277
 278 #endif  /* lowlevellock.h */