January 14th Tuesday 2010

Nginx (九) 事件

结构

struct ngx_event_s {

void *data;

unsigned write:1;

unsigned accept:1;

/* used to detect the stale events in kqueue, rtsig, and epoll */

unsigned instance:1;

* the event was passed or would be passed to a kernel;

* in aio mode - operation was posted.

unsigned active:1;

unsigned disabled:1;

/* the ready event; in aio mode 0 means that no operation can be posted */

unsigned ready:1;

unsigned oneshot:1;

/* aio operation is complete */

unsigned complete:1;

unsigned eof:1;

unsigned error:1;

unsigned timedout:1;

unsigned timer_set:1;

unsigned delayed:1;

unsigned read_discarded:1;

unsigned unexpected_eof:1;

unsigned deferred_accept:1;

/* the pending eof reported by kqueue or in aio chain operation */

unsigned pending_eof:1;

#if !(NGX_THREADS)

unsigned posted_ready:1;

#endif

#if (NGX_WIN32)

/* setsockopt(SO_UPDATE_ACCEPT_CONTEXT) was succesfull */

unsigned accept_context_updated:1;

#endif

#if (NGX_HAVE_KQUEUE)

unsigned kq_vnode:1;

/* the pending errno reported by kqueue */

int kq_errno;

#endif

* kqueue only:

* accept: number of sockets that wait to be accepted

* read: bytes to read when event is ready

* or lowat when event is set with NGX_LOWAT_EVENT flag

* write: available space in buffer when event is ready

* or lowat when event is set with NGX_LOWAT_EVENT flag

* iocp: TODO

* otherwise:

* accept: 1 if accept many, 0 otherwise

#if (NGX_HAVE_KQUEUE) || (NGX_HAVE_IOCP)

int available;

#else

unsigned available:1;

#endif

ngx_event_handler_pt handler;

#if (NGX_HAVE_AIO)

#if (NGX_HAVE_IOCP)

ngx_event_ovlp_t ovlp;

#else

struct aiocb aiocb;

#endif

ngx_uint_t index;

ngx_log_t *log;

ngx_rbtree_node_t timer;

unsigned closed:1;

/* to test on worker exit */

unsigned channel:1;

unsigned resolver:1;

#if (NGX_THREADS)

unsigned locked:1;

unsigned posted_ready:1;

unsigned posted_timedout:1;

unsigned posted_eof:1;

#if (NGX_HAVE_KQUEUE)

/* the pending errno reported by kqueue */

int posted_errno;

#endif

#if (NGX_HAVE_KQUEUE) || (NGX_HAVE_IOCP)

int posted_available;

#else

unsigned posted_available:1;

#endif

ngx_atomic_t *lock;

ngx_atomic_t *own_lock;

#endif

/* the links of the posted queue */

ngx_event_t *next;

ngx_event_t **prev;

#if 0

/* the threads support */

* the event thread context, we store it here

* if $(CC) does not understand __thread declaration

* and pthread_getspecific() is too costly

void *thr_ctx;

#if (NGX_EVENT_T_PADDING)

/* event should not cross cache line in SMP */

uint32_t padding[NGX_EVENT_T_PADDING];

#endif

};

typedef struct {

ngx_uint_t lock;

ngx_event_t *events;

ngx_event_t *last;

} ngx_event_mutex_t;

typedef struct {

ngx_int_t (*add)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);

ngx_int_t (*del)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);

ngx_int_t (*enable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);

ngx_int_t (*disable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);

ngx_int_t (*add_conn)(ngx_connection_t *c);

ngx_int_t (*del_conn)(ngx_connection_t *c, ngx_uint_t flags);

ngx_int_t (*process_changes)(ngx_cycle_t *cycle, ngx_uint_t nowait);

ngx_int_t (*process_events)(ngx_cycle_t *cycle, ngx_msec_t timer,

ngx_uint_t flags);

ngx_int_t (*init)(ngx_cycle_t *cycle, ngx_msec_t timer);

void (*done)(ngx_cycle_t *cycle);

} ngx_event_actions_t;

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January 14th Tuesday 2010

结构

相关函数

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