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#ifndef _NGX_EVENT_H_INCLUDED_
#define _NGX_EVENT_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_types.h>
#include <ngx_time.h>
#include <ngx_socket.h>
#include <ngx_log.h>
#include <ngx_alloc.h>
#include <ngx_array.h>
/* STUB */
#define NGX_LOWAT 10000
#define NGX_INVALID_INDEX 0x80000000
typedef struct ngx_event_s ngx_event_t;
#if (HAVE_IOCP)
typedef struct {
WSAOVERLAPPED ovlp;
ngx_event_t *event;
int error;
} ngx_event_ovlp_t;
#endif
struct ngx_event_s {
void *data;
int (*event_handler)(ngx_event_t *ev);
int (*close_handler)(ngx_event_t *ev);
void *context;
char *action;
unsigned int index;
ngx_event_t *prev; /* queue in mutex(), aio_read(), aio_write() */
ngx_event_t *next; /* */
int (*timer_handler)(ngx_event_t *ev);
ngx_event_t *timer_prev;
ngx_event_t *timer_next;
ngx_msec_t timer_delta;
ngx_msec_t timer;
ngx_log_t *log;
int available; /* kqueue only: */
/* accept: number of sockets that wait */
/* to be accepted */
/* read: bytes to read */
/* write: available space in buffer */
/* otherwise: */
/* accept: 1 if accept many, 0 otherwise */
unsigned oneshot:1;
#if 0
unsigned listening:1;
#endif
unsigned write:1;
unsigned active:1;
unsigned ready:1;
unsigned timedout:1;
unsigned blocked:1;
unsigned timer_set:1;
unsigned process:1;
unsigned read_discarded:1;
unsigned ignore_econnreset:1;
unsigned unexpected_eof:1;
#if (HAVE_DEFERRED_ACCEPT)
unsigned deferred_accept:1;
#endif
#if (HAVE_KQUEUE)
unsigned eof:1;
int error;
#endif
#if (HAVE_LOWAT_EVENT) /* kqueue's NOTE_LOWAT */
int lowat;
#endif
#if (HAVE_AIO)
#if (HAVE_IOCP)
ngx_event_ovlp_t ovlp;
#else
struct aiocb aiocb;
#endif
#endif
#if 0
void *thr_ctx; /* event thread context if $(CC) doesn't
understand __thread declaration
and pthread_getspecific() is too costly */
#if (NGX_EVENT_T_PADDING)
int padding[NGX_EVENT_T_PADDING]; /* event should not cross
cache line in SMP */
#endif
#endif
};
typedef enum {
NGX_SELECT_EVENT_N = 0,
#if (HAVE_POLL)
NGX_POLL_EVENT_N,
#endif
#if (HAVE_DEVPOLL)
NGX_DEVPOLL_EVENT_N,
#endif
#if (HAVE_KQUEUE)
NGX_KQUEUE_EVENT_N,
#endif
#if (HAVE_AIO)
NGX_AIO_EVENT_N,
#endif
#if (HAVE_IOCP)
NGX_IOCP_EVENT_N,
#endif
NGX_DUMMY_EVENT_N /* avoid comma at end of enumerator list */
} ngx_event_type_e ;
typedef struct {
int (*add)(ngx_event_t *ev, int event, u_int flags);
int (*del)(ngx_event_t *ev, int event, u_int flags);
void (*timer)(ngx_event_t *ev, ngx_msec_t timer);
int (*process)(ngx_log_t *log);
int (*read)(ngx_event_t *ev, char *buf, size_t size);
/*
int (*write)(ngx_event_t *ev, char *buf, size_t size);
*/
} ngx_event_actions_t;
/* Event filter requires to read/write the whole data -
select, poll, /dev/poll, kqueue. */
#define NGX_HAVE_LEVEL_EVENT 1
/* Event filter is deleted after notification - select, poll, kqueue.
Using /dev/poll it can be implemented with additional syscall */
#define NGX_HAVE_ONESHOT_EVENT 2
/* Event filter notifies only changes and initial level - kqueue */
#define NGX_HAVE_CLEAR_EVENT 4
/* Event filter has kqueue features - eof flag, errno, available data, etc */
#define NGX_HAVE_KQUEUE_EVENT 8
/* Event filter supports low water mark - kqueue's NOTE_LOWAT,
early kqueue implementations have no NOTE_LOWAT so we need a separate flag */
#define NGX_HAVE_LOWAT_EVENT 0x00000010
/* Event filter notifies only changes (edges) but not initial level - epoll */
#define NGX_HAVE_EDGE_EVENT 0x00000020
/* No need to add or delete event filters - rt signals */
#define NGX_HAVE_SIGIO_EVENT 0x00000040
/* No need to add or delete event filters - overlapped, aio_read, aioread */
#define NGX_HAVE_AIO_EVENT 0x00000080
/* Need to add socket or handle only once - i/o completion port.
It also requires HAVE_AIO_EVENT and NGX_HAVE_AIO_EVENT to be set */
#define NGX_HAVE_IOCP_EVENT 0x00000100
#define NGX_USE_LEVEL_EVENT 0x00010000
/* Event filter is deleted before closing file. Has no meaning
for select, poll, epoll.
kqueue: kqueue deletes event filters for file that closed
so we need only to delete filters in user-level batch array
/dev/poll: we need to flush POLLREMOVE event before closing file */
#define NGX_CLOSE_EVENT 1
#if (HAVE_KQUEUE)
#define NGX_READ_EVENT EVFILT_READ
#define NGX_WRITE_EVENT EVFILT_WRITE
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT EV_ONESHOT
#ifndef HAVE_CLEAR_EVENT
#define HAVE_CLEAR_EVENT 1
#endif
#if (HAVE_CLEAR_EVENT)
#define NGX_CLEAR_EVENT EV_CLEAR
#endif
#elif (HAVE_POLL) || (HAVE_DEVPOLL)
#define NGX_READ_EVENT POLLIN
#define NGX_WRITE_EVENT POLLOUT
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT 1
#else
#define NGX_READ_EVENT 0
#define NGX_WRITE_EVENT 1
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT 1
#endif /* HAVE_KQUEUE */
#if (USE_KQUEUE)
#define ngx_init_events ngx_kqueue_init
#define ngx_process_events ngx_kqueue_process_events
#define ngx_add_event ngx_kqueue_add_event
#define ngx_del_event ngx_kqueue_del_event
#if 0
#define ngx_add_timer ngx_kqueue_add_timer
#else
#define ngx_add_timer ngx_event_add_timer
#endif
#define ngx_event_recv ngx_event_recv_core
#else
#define ngx_init_events (ngx_event_init[ngx_event_type])
#define ngx_process_events ngx_event_actions.process
#define ngx_add_event ngx_event_actions.add
#define ngx_del_event ngx_event_actions.del
#if 0
#define ngx_add_timer ngx_event_actions.timer
#else
#define ngx_add_timer ngx_event_add_timer
#endif
#if (HAVE_IOCP_EVENT)
#define ngx_event_recv ngx_event_wsarecv
#elif (HAVE_AIO_EVENT)
#define ngx_event_recv ngx_event_aio_read
#else
#define ngx_event_recv ngx_event_recv_core
#endif
#endif
#define ngx_del_timer ngx_event_del_timer
extern ngx_event_t *ngx_read_events;
extern ngx_event_t *ngx_write_events;
extern ngx_connection_t *ngx_connections;
#if !(USE_KQUEUE)
extern ngx_event_actions_t ngx_event_actions;
extern ngx_event_type_e ngx_event_type;
extern int ngx_event_flags;
#endif
ssize_t ngx_event_recv_core(ngx_connection_t *c, char *buf, size_t size);
int ngx_event_close_connection(ngx_event_t *ev);
void ngx_pre_thread(ngx_array_t *ls, ngx_pool_t *pool, ngx_log_t *log);
void ngx_worker(ngx_log_t *log);
#endif /* _NGX_EVENT_H_INCLUDED_ */
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