git.m6w6.name Git - m6w6/libmemcached/blob - src/bin/contrib/memaslap/ms_atomic.h

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #ifndef CLIENTS_MS_ATOMIC_H
  17 #define CLIENTS_MS_ATOMIC_H
  18
  19 #include "mem_config.h"
  20
  21 #if defined(__SUNPRO_C) || defined(HAVE_ATOMIC_ADD_NV)
  22 #  define ATOMIC volatile
  23 #  define _KERNEL
  24 #  include <atomic.h>
  25 #  if SIZEOF_SIZE_T == 8
  26 #    define atomic_add_size(X, Y) atomic_add_64((X), (Y))
  27 #  else
  28 #    define atomic_add_size(X, Y) atomic_add_32((X), (Y))
  29 #  endif
  30 #  undef _KERNEL
  31
  32 #elif HAVE_C_STDATOMIC
  33 #  define ATOMIC _Atomic
  34 #  include <stdatomic.h>
  35 #  define atomic_dec_32(X)        atomic_fetch_sub(X,1)
  36 #  define atomic_add_32           atomic_fetch_add
  37 #  define atomic_add_32_nv(X,Y)  (atomic_fetch_add(X,Y)+(Y))
  38 #  define atomic_add_size         atomic_fetch_add
  39
  40 #elif HAVE_BUILTIN_ATOMIC
  41 #  define ATOMIC
  42 #  define atomic_dec_32(X)  BUILTIN_ATOMIC_PREFIX ## _atomic_fetch_sub(X,1)
  43 #  define atomic_add_32     BUILTIN_ATOMIC_PREFIX ## _atomic_fetch_add
  44 #  define atomic_add_32_nv  BUILTIN_ATOMIC_PREFIX ## _atomic_add_fetch(X,Y)
  45 #  define atomic_add_size   BUILTIN_ATOMIC_PREFIX ## _atomic_fetch_add
  46
  47 #elif HAVE_BUILTIN_SYNC
  48 #  define ATOMIC
  49 #  define atomic_dec_32(X)  __sync_fetch_and_sub((X), 1)
  50 #  define atomic_add_32     __sync_fetch_and_add
  51 #  define atomic_add_32_nv  __sync_add_and_fetch
  52 #  define atomic_add_size   __sync_fetch_and_add
  53
  54 #else
  55 #  warning "Atomic operators not found so memslap will not work correctly"
  56 #  define ATOMIC
  57 #  define atomic_dec_32(X)    (--(*(X)))
  58 #  define atomic_add_32(X,Y)  ((*(X))+=(Y))
  59 #  define atomic_add_32_nv    atomic_add_32
  60 #  define atomic_add_size     atomic_add_32
  61
  62 #endif
  63
  64 #endif /* CLIENTS_MS_ATOMIC_H */