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/**
* Many similar implementations exist. See for example libwsbm
* or the linux kernel include/atomic.h
*
* No copyright claimed on this file.
*
*/
#ifndef P_ATOMIC_H
#define P_ATOMIC_H
#include "p_defines.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#if (defined(PIPE_CC_GCC))
struct pipe_atomic {
int32_t count;
};
#define p_atomic_set(_v, _i) ((_v)->count = (_i))
#define p_atomic_read(_v) ((_v)->count)
static INLINE boolean
p_atomic_dec_zero(struct pipe_atomic *v)
{
#ifdef __i386__
unsigned char c;
__asm__ __volatile__("lock; decl %0; sete %1":"+m"(v->count), "=qm"(c)
::"memory");
return c != 0;
#else /* __i386__*/
return (__sync_sub_and_fetch(&v->count, 1) == 0);
#endif /* __i386__*/
}
static INLINE void
p_atomic_inc(struct pipe_atomic *v)
{
#ifdef __i386__
__asm__ __volatile__("lock; incl %0":"+m"(v->count));
#else /* __i386__*/
(void) __sync_add_and_fetch(&v->count, 1);
#endif /* __i386__*/
}
static INLINE void
p_atomic_dec(struct pipe_atomic *v)
{
#ifdef __i386__
__asm__ __volatile__("lock; decl %0":"+m"(v->count));
#else /* __i386__*/
(void) __sync_sub_and_fetch(&v->count, 1);
#endif /* __i386__*/
}
static INLINE int32_t
p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
{
return __sync_val_compare_and_swap(&v->count, old, new);
}
#else /* (defined(PIPE_CC_GCC)) */
#include "pipe/p_thread.h"
/**
* This implementation should really not be used.
* Add an assembly port instead. It may abort and
* doesn't destroy used mutexes.
*/
struct pipe_atomic {
pipe_mutex mutex;
int32_t count;
};
static INLINE void
p_atomic_set(struct pipe_atomic *v, int32_t i)
{
int ret;
ret = pipe_mutex_init(v->mutex);
if (ret)
abort();
pipe_mutex_lock(v->mutex);
v->count = i;
pipe_mutex_unlock(v->mutex);
}
static INLINE int32_t
p_atomic_read(struct pipe_atomic *v)
{
int32_t ret;
pipe_mutex_lock(v->mutex);
ret = v->count;
pipe_mutex_unlock(v->mutex);
return ret;
}
static INLINE void
p_atomic_inc(struct pipe_atomic *v)
{
pipe_mutex_lock(v->mutex);
++v->count;
pipe_mutex_unlock(v->mutex);
}
static INLINE void
p_atomic_dec(struct pipe_atomic *v)
{
pipe_mutex_lock(v->mutex);
--v->count;
pipe_mutex_unlock(v->mutex);
}
static INLINE boolean
p_atomic_dec_zero(struct pipe_atomic *v)
{
boolean ret;
pipe_mutex_lock(v->mutex);
ret = (--v->count == 0);
pipe_mutex_unlock(v->mutex);
return ret;
}
static INLINE int32_t
p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
{
int32_t ret;
pipe_mutex_lock(v->mutex);
ret = v->count;
if (ret == old)
v->count = new;
pipe_mutex_unlock(v->mutex);
return ret;
}
#endif /* (defined(PIPE_CC_GCC)) */
#ifdef __cplusplus
}
#endif
#endif /* P_ATOMIC_H */
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