/* * Copyright (C) 2006 iptelorg GmbH * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /** * @defgroup atomic SIP-router atomic operations * @brief SIP-router atomic operations and memory barriers support * * SIP-router atomic operations and memory barriers support for different CPU * architectures implemented in assembler. It also provides some generic * fallback code for architectures not currently supported. */ /** * @file * @brief Common part for all the atomic operations * * Common part for all the atomic operations (atomic_t and common operations) * see atomic_ops.h for more info. * @ingroup atomic */ /* * History: * -------- * 2006-03-08 created by andrei * 2007-05-13 split from atomic_ops.h (andrei) */ #ifndef __atomic_common #define __atomic_common /** * @brief atomic_t defined as a struct to easily catch non atomic operations on it. * * atomic_t defined as a struct to easily catch non atomic operations on it, * e.g. atomic_t foo; foo++ will generate a compile error. */ typedef struct{ volatile int val; } atomic_t; /** * @name Atomic load and store operations * Atomic store and load operations are atomic on all cpus, note however that they * don't include memory barriers so if you want to use atomic_{get,set} * to implement mutexes you must use the mb_* versions or explicitely use * the barriers */ /*@{ */ #define atomic_set_int(pvar, i) (*(int*)(pvar)=i) #define atomic_set_long(pvar, i) (*(long*)(pvar)=i) #define atomic_get_int(pvar) (*(int*)(pvar)) #define atomic_get_long(pvar) (*(long*)(pvar)) #define atomic_set(at_var, value) (atomic_set_int(&((at_var)->val), (value))) inline static int atomic_get(atomic_t *v) { return atomic_get_int(&(v->val)); } /*@} */ #endif