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/* flib - fundamental c library.
*
* Copyright (C) 2008- Luo Jinghua <sunmoon1997@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef F_ATOMIC_H
#define F_ATOMIC_H
#include <milkway/mw-types.h>
/**
* @file mw-atomic.h
* @brief Basic atomic integer and pointer operations
* @defgroup atomic Basic atomic integer and pointer operations
* @ingroup fcore
* @{
*/
MW_BEGIN_DECLS
/**
* @brief Reads the value of a integer by atomic.
*
* Reads the value of the integer pointed to by atomic. Issues
* memory barrier as needed.
*
* @param atomic a pointer to a integer.
*/
mw_public int
mw_atomic_get (const volatile int * atomic);
/**
* @brief Sets the value of a integer by atomic.
*
* Sets the value of the integer pointed to by atomic. Issues
* memory barrier as needed.
*
* @param atomic a pointer to a integer.
* @param val the value to set.
*/
mw_public void
mw_atomic_set (volatile int * atomic, int val);
/**
* @brief Adds a value to a integer by atomic.
*
* @param atomic a pointer to a integer.
* @param count the value
*/
mw_public int
mw_atomic_add (volatile int * atomic, int count);
/**
* @brief Subs a value to a integer by atomic.
*
* @param atomic a pointer to a integer.
* @param count the value
*/
mw_public int
mw_atomic_sub (volatile int * atomic, int count);
/**
* @brief Subs a value to a integer by atomic and returns MW_TRUE if
* result is zero.
*
* @param atomic a pointer to a integer.
* @param count the value
* @return MW_TRUE if result is zero
*/
mw_public mw_bool_t
mw_atomic_sub_and_test (volatile int * atomic, int count);
/**
* @brief Compares oldval with the integer pointed to by atomic and if
* they are equal, atomically exchanges atomic with newval. Issues
* memory barrier as needed.
*
* @param atomic a pointer to a integer.
* @param oldval the old value
* @param newval the new value
* @return MW_TRUE if oldval is equal to *atomic
*/
mw_public mw_bool_t
mw_atomic_cmpxchg (volatile int * atomic,
int oldval, int newval);
/**
* @brief Sets the value of a pointer by atomic.
*
* @param atomic a pointer to a pointer
* @param ptr the value to set
*/
mw_public void
mw_atomic_pointer_set (volatile mw_pointer_t * atomic,
mw_pointer_t ptr);
/**
* @brief Reads the value of a pointer by atomic.
*
* @param atomic a pointer to a pointer
* @return returns the value of *atomic
*/
mw_public mw_pointer_t
mw_atomic_pointer_get (volatile mw_pointer_t * atomic);
/**
* @brief Compares oldval with the pointer pointed to by atomic and if
* they are equal, atomically exchanges atomic with newval. Issues
* memory barrier as needed.
*
* @param atomic a pointer to a pointer.
* @param oldval the old value
* @param newval the new value
* @return MW_TRUE if oldval is equal to *atomic
*/
mw_public mw_bool_t
mw_atomic_pointer_cmpxchg (volatile mw_pointer_t * atomic,
mw_pointer_t oldval,
mw_pointer_t newval);
MW_END_DECLS
/**
* @}
*/
#endif
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