Per-CPU dynamic objects

include/smp/percpu.h View source View on GitHub

Structs

percpu_descriptor

struct percpu_descriptor {
    const char                     *name;
    size_t                         size;
    size_t                         align;
    void                           **percpu_ptrs;
    percpu_descriptor_constructor  constructor;
};

Type Aliases

percpu_descriptor_constructor

typedef void (*percpu_descriptor_constructor)(void * *, size_t);

Functions

percpu_obj_init

void percpu_obj_init(void);

Macros

PERCPU_DECLARE

#define PERCPU_DECLARE(__n, __type, __ctor) \
    extern __type __percpu_##__n; \
    static void __percpu_ctor_##__n(void *inst, size_t cpu) { \
        if ((__ctor) != NULL) \
            __ctor((__type *) inst, cpu); \
    } \
    LINKER_SECTION_OBJECT(struct percpu_descriptor, percpu_desc) \
    __percpu_desc_##__n = { \
        .name = #__n, \
        .size = sizeof(__type), \
        .align = _Alignof(__type), \
        .percpu_ptrs = NULL, \
        .constructor = __percpu_ctor_##__n, \
    }; \
    __type __percpu_##__n

PERCPU_PTR_FOR_CPU

#define PERCPU_PTR_FOR_CPU(name, cpu) \
    ((typeof(__percpu_##name) *) __percpu_desc_##name.percpu_ptrs[cpu])

PERCPU_READ_FOR_CPU

#define PERCPU_READ_FOR_CPU(name, cpu) \
    (*((typeof(__percpu_##name) *) PERCPU_PTR_FOR_CPU(name, cpu)))

PERCPU_PTR

#define PERCPU_PTR(name) PERCPU_PTR_FOR_CPU(name, smp_core_id())

PERCPU_READ

#define PERCPU_READ(name) (*((typeof(__percpu_##name) *) PERCPU_PTR(name)))

PERCPU_WRITE

#define PERCPU_WRITE(name, val) (PERCPU_READ(name) = (val))

---