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/*
* Copyright (c) 2010 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef HEIM_BASE_ATOMICS_H
#define HEIM_BASE_ATOMICS_H 1
#include "config.h"
/*
* Atomic operations
*/
#if defined(HAVE_STDATOMIC_H)
#include <stdatomic.h>
#define heim_base_atomic_init(t, v) atomic_init(t, v)
#define heim_base_atomic_load(x) atomic_load((x))
#define heim_base_atomic_store(t, v) atomic_store((t), (v))
#define heim_base_atomic(T) _Atomic(T)
#define heim_base_atomic_inc(x) (atomic_fetch_add((x), 1) + 1)
#define heim_base_atomic_dec(x) (atomic_fetch_sub((x), 1) - 1)
#define heim_base_atomic_integer_type heim_base_atomic(unsigned int)
#define heim_base_atomic_integer_max UINT_MAX
#define heim_base_exchange_pointer(t,v) atomic_exchange((t), (v))
#define heim_base_exchange_32(t,v) atomic_exchange((t), (v))
#define heim_base_exchange_64(t,v) atomic_exchange((t), (v))
#elif defined(__GNUC__) && defined(HAVE___SYNC_ADD_AND_FETCH)
#define heim_base_atomic_barrier() __sync_synchronize()
#define heim_base_atomic_inc(x) __sync_add_and_fetch((x), 1)
#define heim_base_atomic_dec(x) __sync_sub_and_fetch((x), 1)
#define heim_base_atomic_integer_type unsigned int
#define heim_base_atomic_integer_max UINT_MAX
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
#if __has_builtin(__sync_swap)
#define heim_base_exchange_pointer(t,v) __sync_swap((t), (v))
#else
/* FIXME: some targets may only write the value 1 into *t */
#define heim_base_exchange_pointer(t,v) __sync_lock_test_and_set((t), (v))
#endif
#define heim_base_exchange_32(t,v) heim_base_exchange_pointer((t), (v))
#define heim_base_exchange_64(t,v) heim_base_exchange_pointer((t), (v))
#elif defined(__sun)
#include <sys/atomic.h>
#define heim_base_atomic_barrier() __machine_rw_barrier()
#define heim_base_atomic_inc(x) atomic_inc_uint_nv((volatile uint_t *)(x))
#define heim_base_atomic_dec(x) atomic_dec_uint_nv((volatile uint_t *)(x))
#define heim_base_atomic_integer_type uint_t
#define heim_base_atomic_integer_max UINT_MAX
#define heim_base_exchange_pointer(t,v) atomic_swap_ptr((volatile void *)(t), (void *)(v))
#define heim_base_exchange_32(t,v) atomic_swap_32((volatile uint32_t *)(t), (v))
#define heim_base_exchange_64(t,v) atomic_swap_64((volatile uint64_t *)(t), (v))
#elif defined(_AIX)
#include <sys/atomic_op.h>
#define heim_base_atomic_barrier() __isync()
#define heim_base_atomic_inc(x) (fetch_and_add((atomic_p)(x)) + 1)
#define heim_base_atomic_dec(x) (fetch_and_add((atomic_p)(x)) - 1)
#define heim_base_atomic_integer_type unsigned int
#define heim_base_atomic_integer_max UINT_MAX
static inline void *
heim_base_exchange_pointer(void *p, void *newval)
{
void *val = *(void **)p;
while (!compare_and_swaplp((atomic_l)p, (long *)&val, (long)newval))
;
return val;
}
static inline uint32_t
heim_base_exchange_32(uint32_t *p, uint32_t newval)
{
uint32_t val = *p;
while (!compare_and_swap((atomic_p)p, (int *)&val, (int)newval))
;
return val;
}
static inline uint64_t
heim_base_exchange_64(uint64_t *p, uint64_t newval)
{
uint64_t val = *p;
while (!compare_and_swaplp((atomic_l)p, (long *)&val, (long)newval))
;
return val;
}
#elif defined(_WIN32)
#define heim_base_atomic_barrier() MemoryBarrier()
#define heim_base_atomic_inc(x) InterlockedIncrement(x)
#define heim_base_atomic_dec(x) InterlockedDecrement(x)
#define heim_base_atomic_integer_type LONG
#define heim_base_atomic_integer_max MAXLONG
#define heim_base_exchange_pointer(t,v) InterlockedExchangePointer((PVOID volatile *)(t), (PVOID)(v))
#define heim_base_exchange_32(t,v) ((ULONG)InterlockedExchange((LONG volatile *)(t), (LONG)(v)))
#define heim_base_exchange_64(t,v) ((ULONG64)InterlockedExchange64((LONG64 violatile *)(t), (LONG64)(v)))
#else
#include <heim_threads.h>
#define HEIM_BASE_NEED_ATOMIC_MUTEX 1
extern HEIMDAL_MUTEX _heim_base_mutex;
#define heim_base_atomic_integer_type unsigned int
#define heim_base_atomic_integer_max UINT_MAX
static inline heim_base_atomic_integer_type
heim_base_atomic_inc(heim_base_atomic_integer_type *x)
{
heim_base_atomic_integer_type t;
HEIMDAL_MUTEX_lock(&_heim_base_mutex);
t = ++(*x);
HEIMDAL_MUTEX_unlock(&_heim_base_mutex);
return t;
}
static inline heim_base_atomic_integer_type
heim_base_atomic_dec(heim_base_atomic_integer_type *x)
{
heim_base_atomic_integer_type t;
HEIMDAL_MUTEX_lock(&_heim_base_mutex);
t = --(*x);
HEIMDAL_MUTEX_unlock(&_heim_base_mutex);
return t;
}
static inline void *
heim_base_exchange_pointer(void *target, void *value)
{
void *old;
HEIMDAL_MUTEX_lock(&_heim_base_mutex);
old = *(void **)target;
*(void **)target = value;
HEIMDAL_MUTEX_unlock(&_heim_base_mutex);
return old;
}
static inline uint32_t
heim_base_exchange_32(uint32_t *p, uint32_t newval)
{
uint32_t old;
HEIMDAL_MUTEX_lock(&_heim_base_mutex);
old = *p;
*p = newval;
HEIMDAL_MUTEX_unlock(&_heim_base_mutex);
return old;
}
static inline uint64_t
heim_base_exchange_64(uint64_t *p, uint64_t newval)
{
uint64_t old;
HEIMDAL_MUTEX_lock(&_heim_base_mutex);
old = *p;
*p = newval;
HEIMDAL_MUTEX_unlock(&_heim_base_mutex);
return old;
}
#endif /* defined(__GNUC__) && defined(HAVE___SYNC_ADD_AND_FETCH) */
#ifndef heim_base_atomic
#define heim_base_atomic(T) T
#endif
#ifndef heim_base_atomic_barrier
#define heim_base_atomic_barrier()
#endif
#ifndef heim_base_atomic_load
#define heim_base_atomic_load(x) (heim_base_atomic_barrier(), *(x))
#endif
#ifndef heim_base_atomic_init
#define heim_base_atomic_init(t, v) do { (*(t) = (v)); } while (0)
#endif
#ifndef heim_base_atomic_store
#define heim_base_atomic_store(t, v) do { \
(*(t) = (v)); \
heim_base_atomic_barrier(); \
} while (0)
#endif
#if SIZEOF_TIME_T == 8
#define heim_base_exchange_time_t(t,v) heim_base_exchange_64((t), (v))
#elif SIZEOF_TIME_T == 4
#define heim_base_exchange_time_t(t,v) heim_base_exchange_32((t), (v))
#else
#error set SIZEOF_TIME_T for your platform
#endif
#endif /* HEIM_BASE_ATOMICS_H */
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