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

   1 /* Copyright (C) 2003, 2004 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 /* Returns non-zero if error happened, zero if success.  */
  59 #define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val)                 \
  60 ({                                                                           \
  61    DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_CMP_REQUEUE,              \
  62                      (int) (nr_wake), (int) (nr_move), (long) (mutex),       \
  63                      (int) val);                                             \
  64    _r10 == -1;                                                               \
  65 })
  66
  67 /* Returns non-zero if error happened, zero if success.  */
  68 #define lll_futex_wake_unlock(ftx, nr_wake, nr_wake2, ftx2)                  \
  69 ({                                                                           \
  70    DO_INLINE_SYSCALL(futex, 6, (long) (ftx), FUTEX_WAKE_OP,                  \
  71                      (int) (nr_wake), (int) (nr_wake2), (long) (ftx2),       \
  72                      FUTEX_OP_CLEAR_WAKE_IF_GT_ONE);                         \
  73    _r10 == -1;                                                               \
  74 })
  75
  76
  77 #define __lll_mutex_trylock(futex) \
  78   (atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0)
  79 #define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
  80
  81
  82 #define __lll_mutex_cond_trylock(futex) \
  83   (atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)
  84 #define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
  85
  86
  87 extern void __lll_lock_wait (int *futex) attribute_hidden;
  88
  89
  90 #define __lll_mutex_lock(futex)                                         \
  91   ((void) ({                                                            \
  92     int *__futex = (futex);                                             \
  93     if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0)      \
  94       __lll_lock_wait (__futex);                                        \
  95   }))
  96 #define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
  97
  98
  99 #define __lll_mutex_cond_lock(futex)                                    \
 100   ((void) ({                                                            \
 101     int *__futex = (futex);                                             \
 102     if (atomic_compare_and_exchange_bool_acq (__futex, 2, 0) != 0)      \
 103       __lll_lock_wait (__futex);                                        \
 104   }))
 105 #define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
 106
 107
 108 extern int __lll_timedlock_wait (int *futex, const struct timespec *)
 109      attribute_hidden;
 110
 111
 112 #define __lll_mutex_timedlock(futex, abstime)                           \
 113   ({                                                                    \
 114      int *__futex = (futex);                                            \
 115      int __val = 0;                                                     \
 116                                                                         \
 117      if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0)     \
 118        __val = __lll_timedlock_wait (__futex, abstime);                 \
 119      __val;                                                             \
 120   })
 121 #define lll_mutex_timedlock(futex, abstime) \
 122   __lll_mutex_timedlock (&(futex), abstime)
 123
 124
 125 #define __lll_mutex_unlock(futex)                       \
 126   ((void) ({                                            \
 127     int *__futex = (futex);                             \
 128     int __val = atomic_exchange_rel (__futex, 0);       \
 129                                                         \
 130     if (__builtin_expect (__val > 1, 0))                \
 131       lll_futex_wake (__futex, 1);                      \
 132   }))
 133 #define lll_mutex_unlock(futex) \
 134   __lll_mutex_unlock(&(futex))
 135
 136
 137 #define __lll_mutex_unlock_force(futex)         \
 138   ((void) ({                                    \
 139     int *__futex = (futex);                     \
 140     (void) atomic_exchange_rel (__futex, 0);    \
 141     lll_futex_wake (__futex, 1);                \
 142   }))
 143 #define lll_mutex_unlock_force(futex) \
 144   __lll_mutex_unlock_force(&(futex))
 145
 146
 147 #define lll_mutex_islocked(futex) \
 148   (futex != 0)
 149
 150
 151 /* We have a separate internal lock implementation which is not tied
 152    to binary compatibility.  We can use the lll_mutex_*.  */
 153
 154 /* Type for lock object.  */
 155 typedef int lll_lock_t;
 156
 157 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
 158
 159 /* Initializers for lock.  */
 160 #define LLL_LOCK_INITIALIZER            (0)
 161 #define LLL_LOCK_INITIALIZER_LOCKED     (1)
 162
 163 #define lll_trylock(futex)      lll_mutex_trylock (futex)
 164 #define lll_lock(futex)         lll_mutex_lock (futex)
 165 #define lll_unlock(futex)       lll_mutex_unlock (futex)
 166 #define lll_islocked(futex)     lll_mutex_islocked (futex)
 167
 168
 169 /* The kernel notifies a process with uses CLONE_CLEARTID via futex
 170    wakeup when the clone terminates.  The memory location contains the
 171    thread ID while the clone is running and is reset to zero
 172    afterwards.  */
 173 #define lll_wait_tid(tid) \
 174   do                                            \
 175     {                                           \
 176       __typeof (tid) __tid;                     \
 177       while ((__tid = (tid)) != 0)              \
 178         lll_futex_wait (&(tid), __tid);         \
 179     }                                           \
 180   while (0)
 181
 182 extern int __lll_timedwait_tid (int *, const struct timespec *)
 183      attribute_hidden;
 184
 185 #define lll_timedwait_tid(tid, abstime) \
 186   ({                                                    \
 187     int __res = 0;                                      \
 188     if ((tid) != 0)                                     \
 189       __res = __lll_timedwait_tid (&(tid), (abstime));  \
 190     __res;                                              \
 191   })
 192
 193
 194 /* Conditional variable handling.  */
 195
 196 extern void __lll_cond_wait (pthread_cond_t *cond)
 197      attribute_hidden;
 198 extern int __lll_cond_timedwait (pthread_cond_t *cond,
 199                                  const struct timespec *abstime)
 200      attribute_hidden;
 201 extern void __lll_cond_wake (pthread_cond_t *cond)
 202      attribute_hidden;
 203 extern void __lll_cond_broadcast (pthread_cond_t *cond)
 204      attribute_hidden;
 205
 206 #define lll_cond_wait(cond) \
 207   __lll_cond_wait (cond)
 208 #define lll_cond_timedwait(cond, abstime) \
 209   __lll_cond_timedwait (cond, abstime)
 210 #define lll_cond_wake(cond) \
 211   __lll_cond_wake (cond)
 212 #define lll_cond_broadcast(cond) \
 213   __lll_cond_broadcast (cond)
 214
 215 #endif  /* lowlevellock.h */