include/atomic.h

Go to the documentation of this file.

#ifndef ATOMIC_H_INCLUDED
#define ATOMIC_H_INCLUDED

#include <compiler.h>
#include <stdint.h>

typedef struct {
        uint32_t        value;
} atomic_t;

static inline uint32_t atomic_read(atomic_t *ptr)
{
        barrier();
        return ptr->value;
}

static inline void atomic_write(atomic_t *ptr, uint32_t value)
{
        ptr->value = value;
        barrier();
}

static inline atomic_t atomic_add(atomic_t *ptr, uint32_t value)
{
        atomic_t result;

        result.value = __sync_add_and_fetch(&ptr->value, value);
        return result;
}

static inline atomic_t atomic_sub(atomic_t *ptr, uint32_t value)
{
        atomic_t result;

        result.value = __sync_sub_and_fetch(&ptr->value, value);
        return result;
}

#define atomic_inc(ptr)         atomic_add(ptr, 1)
#define atomic_dec(ptr)         atomic_sub(ptr, 1)

#endif /* ATOMIC_H_INCLUDED */

---