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/* 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 as published by
the Free Software Foundation; version 2 of the License.
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 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, Suite 500, 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:
/** Initialise the PFS_atomic component. */
static void init();
/** Cleanup the PFS_atomic component. */
static void cleanup();
/** Atomic load. */
static inline int32 load_32(volatile int32 *ptr)
{
int32 result;
rdlock(ptr);
result= my_atomic_load32(ptr);
rdunlock(ptr);
return result;
}
/** Atomic load. */
static inline uint32 load_u32(volatile uint32 *ptr)
{
uint32 result;
rdlock(ptr);
result= (uint32) my_atomic_load32((int32*) ptr);
rdunlock(ptr);
return result;
}
/** Atomic store. */
static inline void store_32(volatile int32 *ptr, int32 value)
{
wrlock(ptr);
my_atomic_store32(ptr, value);
wrunlock(ptr);
}
/** Atomic store. */
static inline void store_u32(volatile uint32 *ptr, uint32 value)
{
wrlock(ptr);
my_atomic_store32((int32*) ptr, (int32) value);
wrunlock(ptr);
}
/** Atomic add. */
static inline int32 add_32(volatile int32 *ptr, int32 value)
{
int32 result;
wrlock(ptr);
result= my_atomic_add32(ptr, value);
wrunlock(ptr);
return result;
}
/** Atomic add. */
static inline uint32 add_u32(volatile uint32 *ptr, uint32 value)
{
uint32 result;
wrlock(ptr);
result= (uint32) my_atomic_add32((int32*) ptr, (int32) value);
wrunlock(ptr);
return result;
}
/** Atomic compare and swap. */
static inline bool cas_32(volatile int32 *ptr, int32 *old_value,
int32 new_value)
{
bool result;
wrlock(ptr);
result= my_atomic_cas32(ptr, old_value, new_value);
wrunlock(ptr);
return result;
}
/** Atomic compare and swap. */
static inline bool cas_u32(volatile uint32 *ptr, uint32 *old_value,
uint32 new_value)
{
bool result;
wrlock(ptr);
result= my_atomic_cas32((int32*) ptr, (int32*) old_value,
(uint32) new_value);
wrunlock(ptr);
return result;
}
private:
static my_atomic_rwlock_t m_rwlock_array[256];
/**
Helper used only with non native atomic implementations.
@sa MY_ATOMIC_MODE_RWLOCKS
*/
static inline my_atomic_rwlock_t *get_rwlock(volatile void *ptr)
{
/*
Divide an address by 8 to remove alignment,
modulo 256 to fall in the array.
*/
uint index= (((intptr) ptr) >> 3) & 0xFF;
my_atomic_rwlock_t *result= &m_rwlock_array[index];
return result;
}
/**
Helper used only with non native atomic implementations.
@sa MY_ATOMIC_MODE_RWLOCKS
*/
static inline void rdlock(volatile void *ptr)
{
my_atomic_rwlock_rdlock(get_rwlock(ptr));
}
/**
Helper used only with non native atomic implementations.
@sa MY_ATOMIC_MODE_RWLOCKS
*/
static inline void wrlock(volatile void *ptr)
{
my_atomic_rwlock_wrlock(get_rwlock(ptr));
}
/**
Helper used only with non native atomic implementations.
@sa MY_ATOMIC_MODE_RWLOCKS
*/
static inline void rdunlock(volatile void *ptr)
{
my_atomic_rwlock_rdunlock(get_rwlock(ptr));
}
/**
Helper used only with non native atomic implementations.
@sa MY_ATOMIC_MODE_RWLOCKS
*/
static inline void wrunlock(volatile void *ptr)
{
my_atomic_rwlock_wrunlock(get_rwlock(ptr));
}
};
#endif
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