nptl/sysdeps/unix/sysv/linux/ia64/lowlevellock.h

   1 /* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.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 #include <ia64intrin.h>
  27 #include <atomic.h>
  28
  29 #define __NR_futex              1230
  30 #define FUTEX_WAIT              0
  31 #define FUTEX_WAKE              1
  32 #define FUTEX_REQUEUE           3
  33 #define FUTEX_CMP_REQUEUE       4
  34 #define FUTEX_WAKE_OP           5
  35 #define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE   ((4 << 24) | 1)
  36
  37 /* Delay in spinlock loop.  */
  38 #define BUSY_WAIT_NOP          asm ("hint @pause")
  39
  40 /* Initializer for compatibility lock.  */
  41 #define LLL_MUTEX_LOCK_INITIALIZER (0)
  42
  43 #define lll_futex_wait(futex, val) lll_futex_timed_wait (futex, val, 0)
  44
  45 #define lll_futex_timed_wait(ftx, val, timespec)                        \
  46 ({                                                                      \
  47    DO_INLINE_SYSCALL(futex, 4, (long) (ftx), FUTEX_WAIT, (int) (val),   \
  48                      (long) (timespec));                                \
  49    _r10 == -1 ? -_retval : _retval;                                     \
  50 })
  51
  52 #define lll_futex_wake(ftx, nr)                                         \
  53 ({                                                                      \
  54    DO_INLINE_SYSCALL(futex, 3, (long) (ftx), FUTEX_WAKE, (int) (nr));   \
  55    _r10 == -1 ? -_retval : _retval;                                     \
  56 })
  57
  58 #define lll_robust_mutex_dead(futexv)                                   \
  59 do                                                                      \
  60   {                                                                     \
  61     int *__futexp = &(futexv);                                          \
  62     atomic_or (__futexp, FUTEX_OWNER_DIED);                             \
  63     DO_INLINE_SYSCALL(futex, 3, (long) __futexp, FUTEX_WAKE, 1);        \
  64   }                                                                     \
  65 while (0)
  66
  67 /* Returns non-zero if error happened, zero if success.  */
  68 #define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val)                 \
  69 ({                                                                           \
  70    DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_CMP_REQUEUE,              \
  71                      (int) (nr_wake), (int) (nr_move), (long) (mutex),       \
  72                      (int) val);                                             \
  73    _r10 == -1;                                                               \
  74 })
  75
  76 /* Returns non-zero if error happened, zero if success.  */
  77 #define lll_futex_wake_unlock(ftx, nr_wake, nr_wake2, ftx2)                  \
  78 ({                                                                           \
  79    DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_WAKE_OP,                  \
  80                      (int) (nr_wake), (int) (nr_wake2), (long) (ftx2),       \
  81                      FUTEX_OP_CLEAR_WAKE_IF_GT_ONE);                         \
  82    _r10 == -1;                                                               \
  83 })
  84
  85
  86 #define __lll_mutex_trylock(futex) \
  87   (atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0)
  88 #define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
  89
  90
  91 #define __lll_robust_mutex_trylock(futex, id) \
  92   (atomic_compare_and_exchange_val_acq (futex, id, 0) != 0)
  93 #define lll_robust_mutex_trylock(futex, id) \
  94   __lll_robust_mutex_trylock (&(futex), id)
  95
  96
  97 #define __lll_mutex_cond_trylock(futex) \
  98   (atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)
  99 #define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
 100
 101
 102 extern void __lll_lock_wait (int *futex) attribute_hidden;
 103 extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
 104
 105
 106 #define __lll_mutex_lock(futex)                                         \
 107   ((void) ({                                                            \
 108     int *__futex = (futex);                                             \
 109     if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0)      \
 110       __lll_lock_wait (__futex);                                        \
 111   }))
 112 #define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
 113
 114
 115 #define __lll_robust_mutex_lock(futex, id)                              \
 116   ({                                                                    \
 117     int *__futex = (futex);                                             \
 118     int __val = 0;                                                      \
 119                                                                         \
 120     if (atomic_compare_and_exchange_bool_acq (__futex, id, 0) != 0)     \
 121       __val = __lll_robust_lock_wait (__futex);                         \
 122     __val;                                                              \
 123   })
 124 #define lll_robust_mutex_lock(futex, id) __lll_robust_mutex_lock (&(futex), id)
 125
 126
 127 #define __lll_mutex_cond_lock(futex)                                    \
 128   ((void) ({                                                            \
 129     int *__futex = (futex);                                             \
 130     if (atomic_compare_and_exchange_bool_acq (__futex, 2, 0) != 0)      \
 131       __lll_lock_wait (__futex);                                        \
 132   }))
 133 #define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
 134
 135
 136 #define __lll_robust_mutex_cond_lock(futex, id)                         \
 137   ({                                                                    \
 138     int *__futex = (futex);                                             \
 139     int __val = 0;                                                      \
 140     int __id = (id) | FUTEX_WAITERS;                                    \
 141                                                                         \
 142     if (atomic_compare_and_exchange_bool_acq (__futex, __id, 0) != 0)   \
 143       __val = __lll_robust_lock_wait (__futex);                         \
 144     __val;                                                              \
 145   })
 146 #define lll_robust_mutex_cond_lock(futex, id) \
 147   __lll_robust_mutex_cond_lock (&(futex), id)
 148
 149
 150 extern int __lll_timedlock_wait (int *futex, const struct timespec *)
 151      attribute_hidden;
 152 extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *)
 153      attribute_hidden;
 154
 155
 156 #define __lll_mutex_timedlock(futex, abstime)                           \
 157   ({                                                                    \
 158      int *__futex = (futex);                                            \
 159      int __val = 0;                                                     \
 160                                                                         \
 161      if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0)     \
 162        __val = __lll_timedlock_wait (__futex, abstime);                 \
 163      __val;                                                             \
 164   })
 165 #define lll_mutex_timedlock(futex, abstime) \
 166   __lll_mutex_timedlock (&(futex), abstime)
 167
 168
 169 #define __lll_robust_mutex_timedlock(futex, abstime, id)                \
 170   ({                                                                    \
 171     int *__futex = (futex);                                             \
 172     int __val = 0;                                                      \
 173                                                                         \
 174     if (atomic_compare_and_exchange_bool_acq (__futex, id, 0) != 0)     \
 175       __val = __lll_robust_timedlock_wait (__futex, abstime);           \
 176     __val;                                                              \
 177   })
 178 #define lll_robust_mutex_timedlock(futex, abstime, id) \
 179   __lll_robust_mutex_timedlock (&(futex), abstime, id)
 180
 181
 182 #define __lll_mutex_unlock(futex)                       \
 183   ((void) ({                                            \
 184     int *__futex = (futex);                             \
 185     int __val = atomic_exchange_rel (__futex, 0);       \
 186                                                         \
 187     if (__builtin_expect (__val > 1, 0))                \
 188       lll_futex_wake (__futex, 1);                      \
 189   }))
 190 #define lll_mutex_unlock(futex) \
 191   __lll_mutex_unlock(&(futex))
 192
 193
 194 #define __lll_robust_mutex_unlock(futex)                \
 195   ((void) ({                                            \
 196     int *__futex = (futex);                             \
 197     int __val = atomic_exchange_rel (__futex, 0);       \
 198                                                         \
 199     if (__builtin_expect (__val & FUTEX_WAITERS, 0))    \
 200       lll_futex_wake (__futex, 1);                      \
 201   }))
 202 #define lll_robust_mutex_unlock(futex) \
 203   __lll_robust_mutex_unlock(&(futex))
 204
 205
 206 #define __lll_mutex_unlock_force(futex)         \
 207   ((void) ({                                    \
 208     int *__futex = (futex);                     \
 209     (void) atomic_exchange_rel (__futex, 0);    \
 210     lll_futex_wake (__futex, 1);                \
 211   }))
 212 #define lll_mutex_unlock_force(futex) \
 213   __lll_mutex_unlock_force(&(futex))
 214
 215
 216 #define lll_mutex_islocked(futex) \
 217   (futex != 0)
 218
 219
 220 /* We have a separate internal lock implementation which is not tied
 221    to binary compatibility.  We can use the lll_mutex_*.  */
 222
 223 /* Type for lock object.  */
 224 typedef int lll_lock_t;
 225
 226 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
 227
 228 /* Initializers for lock.  */
 229 #define LLL_LOCK_INITIALIZER            (0)
 230 #define LLL_LOCK_INITIALIZER_LOCKED     (1)
 231
 232 #define lll_trylock(futex)      lll_mutex_trylock (futex)
 233 #define lll_lock(futex)         lll_mutex_lock (futex)
 234 #define lll_unlock(futex)       lll_mutex_unlock (futex)
 235 #define lll_islocked(futex)     lll_mutex_islocked (futex)
 236
 237
 238 /* The kernel notifies a process with uses CLONE_CLEARTID via futex
 239    wakeup when the clone terminates.  The memory location contains the
 240    thread ID while the clone is running and is reset to zero
 241    afterwards.  */
 242 #define lll_wait_tid(tid) \
 243   do                                            \
 244     {                                           \
 245       __typeof (tid) __tid;                     \
 246       while ((__tid = (tid)) != 0)              \
 247         lll_futex_wait (&(tid), __tid);         \
 248     }                                           \
 249   while (0)
 250
 251 extern int __lll_timedwait_tid (int *, const struct timespec *)
 252      attribute_hidden;
 253
 254 #define lll_timedwait_tid(tid, abstime) \
 255   ({                                                    \
 256     int __res = 0;                                      \
 257     if ((tid) != 0)                                     \
 258       __res = __lll_timedwait_tid (&(tid), (abstime));  \
 259     __res;                                              \
 260   })
 261
 262
 263 /* Conditional variable handling.  */
 264
 265 extern void __lll_cond_wait (pthread_cond_t *cond)
 266      attribute_hidden;
 267 extern int __lll_cond_timedwait (pthread_cond_t *cond,
 268                                  const struct timespec *abstime)
 269      attribute_hidden;
 270 extern void __lll_cond_wake (pthread_cond_t *cond)
 271      attribute_hidden;
 272 extern void __lll_cond_broadcast (pthread_cond_t *cond)
 273      attribute_hidden;
 274
 275 #define lll_cond_wait(cond) \
 276   __lll_cond_wait (cond)
 277 #define lll_cond_timedwait(cond, abstime) \
 278   __lll_cond_timedwait (cond, abstime)
 279 #define lll_cond_wake(cond) \
 280   __lll_cond_wake (cond)
 281 #define lll_cond_broadcast(cond) \
 282   __lll_cond_broadcast (cond)
 283
 284 #endif  /* lowlevellock.h */