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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* 32-bit atomic operations.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 __PGM_ATOMIC_H__
#define __PGM_ATOMIC_H__
#ifdef sun
# include <atomic.h>
#endif
#include <pgm/types.h>
static inline
uint32_t
pgm_atomic_exchange_and_add32 (
volatile uint32_t* atomic,
const uint32_t val
)
{
#if defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
uint32_t result;
asm volatile ( "lock\n\t"
"xaddl %0, %1"
: "=r" (result), "=m" (*atomic)
: "0" (val), "m" (*atomic)
: "memory", "cc" );
return result;
#elif defined( __SUNPRO_C ) && (defined( __i386 ) || defined( __amd64 ))
uint32_t result = val;
asm volatile ( "lock\n\t"
"xaddl %0, %1"
:: "r" (result), "m" (*atomic) );
return result;
#elif defined( sun )
const uint32_t nv = atomic_add_32_nv (atomic, (int32_t)val);
return nv - val;
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
return __sync_fetch_and_add (atomic, val);
#elif defined( _WIN32 )
return InterlockedExchangeAdd ((volatile LONG*)atomic, val);
#else
# error "No supported atomic operations for this platform."
#endif
}
static inline
void
pgm_atomic_add32 (
volatile uint32_t* atomic,
const uint32_t val
)
{
#if defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
asm volatile ( "lock\n\t"
"addl %1, %0"
: "=m" (*atomic)
: "ir" (val), "m" (*atomic)
: "memory", "cc" );
#elif defined( __SUNPRO_C ) && (defined( __i386 ) || defined( __amd64 ))
asm volatile ( "lock\n\t"
"addl %1, %0"
:: "r" (val), "m" (*atomic) );
#elif defined( sun )
atomic_add_32 (atomic, (int32_t)val);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
__sync_fetch_and_add (atomic, val);
#elif defined( _WIN32 )
InterlockedExchangeAdd ((volatile LONG*)atomic, val);
#endif
}
static inline
void
pgm_atomic_inc32 (
volatile uint32_t* atomic
)
{
#if (defined( __GNUC__ ) && (defined( __i386__ ) || defined( __x86_64__ ))) || (defined( __SUNPRO_C ) && (defined( __i386 ) || defined( __amd64 )))
pgm_atomic_add32 (atomic, 1);
#elif defined( sun )
atomic_inc_32 (atomic);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
pgm_atomic_add32 (atomic, 1);
#elif defined( _WIN32 )
InterlockedIncrement ((volatile LONG*)atomic);
#endif
}
static inline
void
pgm_atomic_dec32 (
volatile uint32_t* atomic
)
{
#if (defined( __GNUC__ ) && (defined( __i386__ ) || defined( __x86_64__ ))) || (defined( __SUNPRO_C ) && (defined( __i386 ) || defined( __amd64 )))
pgm_atomic_add32 (atomic, (uint32_t)-1);
#elif defined( sun )
atomic_dec_32 (atomic);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
pgm_atomic_add32 (atomic, (uint32_t)-1);
#elif defined( _WIN32 )
InterlockedDecrement ((volatile LONG*)atomic);
#endif
}
static inline
uint32_t
pgm_atomic_read32 (
const volatile uint32_t* atomic
)
{
return *atomic;
}
static inline
void
pgm_atomic_write32 (
volatile uint32_t* atomic,
const uint32_t val
)
{
*atomic = val;
}
#endif /* __PGM_ATOMIC_H__ */
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