include/atomic_wide_counter.h

   1 /* Monotonically increasing wide counters (at least 62 bits).
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _ATOMIC_WIDE_COUNTER_H
  20 #define _ATOMIC_WIDE_COUNTER_H
  21
  22 #include <atomic.h>
  23 #include <bits/atomic_wide_counter.h>
  24
  25 #if __HAVE_64B_ATOMICS
  26
  27 static inline uint64_t
  28 __atomic_wide_counter_load_relaxed (__atomic_wide_counter *c)
  29 {
  30   return atomic_load_relaxed (&c->__value64);
  31 }
  32
  33 static inline uint64_t
  34 __atomic_wide_counter_load_acquire (__atomic_wide_counter *c)
  35 {
  36   return atomic_load_acquire (&c->__value64);
  37 }
  38
  39 static inline uint64_t
  40 __atomic_wide_counter_fetch_add_relaxed (__atomic_wide_counter *c,
  41                                          unsigned int val)
  42 {
  43   return atomic_fetch_add_relaxed (&c->__value64, val);
  44 }
  45
  46 static inline uint64_t
  47 __atomic_wide_counter_fetch_add_acquire (__atomic_wide_counter *c,
  48                                          unsigned int val)
  49 {
  50   return atomic_fetch_add_acquire (&c->__value64, val);
  51 }
  52
  53 static inline void
  54 __atomic_wide_counter_add_relaxed (__atomic_wide_counter *c,
  55                                    unsigned int val)
  56 {
  57   atomic_store_relaxed (&c->__value64,
  58                         atomic_load_relaxed (&c->__value64) + val);
  59 }
  60
  61 static uint64_t __attribute__ ((unused))
  62 __atomic_wide_counter_fetch_xor_release (__atomic_wide_counter *c,
  63                                          unsigned int val)
  64 {
  65   return atomic_fetch_xor_release (&c->__value64, val);
  66 }
  67
  68 #else /* !__HAVE_64B_ATOMICS */
  69
  70 uint64_t __atomic_wide_counter_load_relaxed (__atomic_wide_counter *c)
  71   attribute_hidden;
  72
  73 static inline uint64_t
  74 __atomic_wide_counter_load_acquire (__atomic_wide_counter *c)
  75 {
  76   uint64_t r = __atomic_wide_counter_load_relaxed (c);
  77   atomic_thread_fence_acquire ();
  78   return r;
  79 }
  80
  81 uint64_t __atomic_wide_counter_fetch_add_relaxed (__atomic_wide_counter *c,
  82                                                   unsigned int op)
  83   attribute_hidden;
  84
  85 static inline uint64_t
  86 __atomic_wide_counter_fetch_add_acquire (__atomic_wide_counter *c,
  87                                          unsigned int val)
  88 {
  89   uint64_t r = __atomic_wide_counter_fetch_add_relaxed (c, val);
  90   atomic_thread_fence_acquire ();
  91   return r;
  92 }
  93
  94 static inline void
  95 __atomic_wide_counter_add_relaxed (__atomic_wide_counter *c,
  96                                    unsigned int val)
  97 {
  98   __atomic_wide_counter_fetch_add_relaxed (c, val);
  99 }
 100
 101 #endif /* !__HAVE_64B_ATOMICS */
 102
 103 #endif /* _ATOMIC_WIDE_COUNTER_H */