/usr/include/pgm-5.2/pgm/atomic.h is in libpgm-dev 5.2.122~dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* 32-bit atomic operations.
*
* NB: XADD requires 80486 microprocessor.
*
* 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
*/
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#ifndef __PGM_ATOMIC_H__
#define __PGM_ATOMIC_H__
#if defined( __sun )
# include <atomic.h>
#elif defined( __APPLE__ )
# include <libkern/OSAtomic.h>
#elif defined( _MSC_VER )
/* not implemented in MinGW */
# include <intrin.h>
#endif
#include <pgm/types.h>
/* 32-bit word addition returning original atomic value.
*
* uint32_t tmp = *atomic;
* *atomic += val;
* return tmp;
*/
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; xaddl %0, %1"
: "=r" (result), "=m" (*atomic)
: "0" (val), "m" (*atomic)
: "memory", "cc" );
return result;
#elif (defined( __SUNPRO_C ) || defined( __SUNPRO_CC )) && (defined( __i386 ) || defined( __amd64 ))
uint32_t result = val;
__asm__ volatile ("lock; xaddl %0, %1"
:: "r" (result), "m" (*atomic) );
return result;
#elif defined( __sun )
/* Solaris intrinsic */
const uint32_t nv = atomic_add_32_nv (atomic, (int32_t)val);
return nv - val;
#elif defined( __APPLE__ )
/* Darwin intrinsic */
const uint32_t nv = OSAtomicAdd32Barrier ((int32_t)val, (volatile int32_t*)atomic);
return nv - val;
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
/* GCC 4.0.1 intrinsic */
return __sync_fetch_and_add (atomic, val);
#elif defined( _WIN32 )
/* Windows intrinsic */
return _InterlockedExchangeAdd ((volatile LONG*)atomic, val);
#else
# error "No supported atomic operations for this platform."
#endif
}
/* 32-bit word addition.
*
* *atomic += val;
*/
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; addl %1, %0"
: "=m" (*atomic)
: "ir" (val), "m" (*atomic)
: "memory", "cc" );
#elif (defined( __SUNPRO_C ) || defined( __SUNPRO_CC )) && (defined( __i386 ) || defined( __amd64 ))
__asm__ volatile ("lock; addl %1, %0"
:: "r" (val), "m" (*atomic) );
#elif defined( __sun )
atomic_add_32 (atomic, (int32_t)val);
#elif defined( __APPLE__ )
OSAtomicAdd32Barrier ((int32_t)val, (volatile int32_t*)atomic);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
/* interchangable with __sync_fetch_and_add () */
__sync_add_and_fetch (atomic, val);
#elif defined( _WIN32 )
_InterlockedExchangeAdd ((volatile LONG*)atomic, val);
#endif
}
/* 32-bit word increment.
*
* *atomic++;
*/
static inline
void
pgm_atomic_inc32 (
volatile uint32_t* atomic
)
{
#if defined( __GNUC__ ) && (defined( __i386__ ) || defined( __x86_64__ ))
__asm__ volatile ("lock; incl %0"
: "+m" (*atomic)
:
: "memory", "cc" );
#elif (defined( __SUNPRO_C ) || defined( __SUNPRO_CC )) && (defined( __i386 ) || defined( __amd64 ))
__asm__ volatile ("lock; incl %0"
:: "m" (*atomic) );
#elif defined( __sun )
atomic_inc_32 (atomic);
#elif defined( __APPLE__ )
OSAtomicIncrement32Barrier ((volatile int32_t*)atomic);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
pgm_atomic_add32 (atomic, 1);
#elif defined( _WIN32 )
_InterlockedIncrement ((volatile LONG*)atomic);
#endif
}
/* 32-bit word decrement.
*
* *atomic--;
*/
static inline
void
pgm_atomic_dec32 (
volatile uint32_t* atomic
)
{
#if defined( __GNUC__ ) && (defined( __i386__ ) || defined( __x86_64__ ))
__asm__ volatile ("lock; decl %0"
: "+m" (*atomic)
:
: "memory", "cc" );
#elif (defined( __SUNPRO_C ) || defined( __SUNPRO_CC )) && (defined( __i386 ) || defined( __amd64 ))
__asm__ volatile ("lock\n\t"
"decl %0"
:: "m" (*atomic) );
#elif defined( __sun )
atomic_dec_32 (atomic);
#elif defined( __APPLE__ )
OSAtomicDecrement32Barrier ((volatile int32_t*)atomic);
#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
pgm_atomic_add32 (atomic, (uint32_t)-1);
#elif defined( _WIN32 )
_InterlockedDecrement ((volatile LONG*)atomic);
#endif
}
/* 32-bit word load
*/
static inline
uint32_t
pgm_atomic_read32 (
const volatile uint32_t* atomic
)
{
return *atomic;
}
/* 32-bit word store
*/
static inline
void
pgm_atomic_write32 (
volatile uint32_t* atomic,
const uint32_t val
)
{
*atomic = val;
}
#endif /* __PGM_ATOMIC_H__ */
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