include/generic/atomic.h

Go to the documentation of this file.

#ifndef GENERIC_ATOMIC_H_INCLUDED
#define GENERIC_ATOMIC_H_INCLUDED

#include <compiler.h>
#include <interrupt.h>

typedef struct atomic_object {
        atomic_value_t  value;
} atomic_t;

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

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

static inline atomic_t atomic_add(atomic_t *ptr, atomic_value_t value)
{
        atomic_t        result;
        irqflags_t      iflags;

        iflags = cpu_irq_save();
        result.value = ptr->value + value;
        ptr->value = result.value;
        cpu_irq_restore(iflags);

        return result;
}

static inline atomic_t atomic_sub(atomic_t *ptr, atomic_value_t value)
{
        atomic_t        result;
        irqflags_t      iflags;

        iflags = cpu_irq_save();
        result.value = ptr->value - value;
        ptr->value = result.value;
        cpu_irq_restore(iflags);

        return result;
}


#endif /* GENERIC_ATOMIC_H_INCLUDED */

---