mariadb/storage/perfschema/pfs_atomic.h

/* Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is also distributed with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have included with MySQL.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License, version 2.0, for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software Foundation,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#ifndef PFS_ATOMIC_H
#define PFS_ATOMIC_H

/**
  @file storage/perfschema/pfs_atomic.h
  Atomic operations (declarations).
*/

#include <my_atomic.h>

/** Helper for atomic operations. */
class PFS_atomic
{
public:
  /** Atomic load. */
  static inline int32 load_32(volatile int32 *ptr)
  {
    return my_atomic_load32(ptr);
  }

  /** Atomic load. */
  static inline int64 load_64(volatile int64 *ptr)
  {
    return my_atomic_load64(ptr);
  }

  /** Atomic load. */
  static inline uint32 load_u32(volatile uint32 *ptr)
  {
    return (uint32) my_atomic_load32((int32*) ptr);
  }

  /** Atomic load. */
  static inline uint64 load_u64(volatile uint64 *ptr)
  {
    return (uint64) my_atomic_load64((int64*) ptr);
  }

  /** Atomic store. */
  static inline void store_32(volatile int32 *ptr, int32 value)
  {
    my_atomic_store32(ptr, value);
  }

  /** Atomic store. */
  static inline void store_64(volatile int64 *ptr, int64 value)
  {
    my_atomic_store64(ptr, value);
  }

  /** Atomic store. */
  static inline void store_u32(volatile uint32 *ptr, uint32 value)
  {
    my_atomic_store32((int32*) ptr, (int32) value);
  }

  /** Atomic store. */
  static inline void store_u64(volatile uint64 *ptr, uint64 value)
  {
    my_atomic_store64((int64*) ptr, (int64) value);
  }

  /** Atomic add. */
  static inline int32 add_32(volatile int32 *ptr, int32 value)
  {
    return my_atomic_add32(ptr, value);
  }

  /** Atomic add. */
  static inline int64 add_64(volatile int64 *ptr, int64 value)
  {
    return my_atomic_add64(ptr, value);
  }

  /** Atomic add. */
  static inline uint32 add_u32(volatile uint32 *ptr, uint32 value)
  {
    return (uint32) my_atomic_add32((int32*) ptr, (int32) value);
  }

  /** Atomic add. */
  static inline uint64 add_u64(volatile uint64 *ptr, uint64 value)
  {
    return (uint64) my_atomic_add64((int64*) ptr, (int64) value);
  }

  /** Atomic compare and swap. */
  static inline bool cas_32(volatile int32 *ptr, int32 *old_value,
                            int32 new_value)
  {
    return my_atomic_cas32(ptr, old_value, new_value);
  }

  /** Atomic compare and swap. */
  static inline bool cas_64(volatile int64 *ptr, int64 *old_value,
                            int64 new_value)
  {
    return my_atomic_cas64(ptr, old_value, new_value);
  }

  /** Atomic compare and swap. */
  static inline bool cas_u32(volatile uint32 *ptr, uint32 *old_value,
                             uint32 new_value)
  {
    return my_atomic_cas32((int32*) ptr, (int32*) old_value,
                            (uint32) new_value);
  }

  /** Atomic compare and swap. */
  static inline bool cas_u64(volatile uint64 *ptr, uint64 *old_value,
                             uint64 new_value)
  {
    return my_atomic_cas64((int64*) ptr, (int64*) old_value,
                            (uint64) new_value);
  }
};

#endif