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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_aio.h>
#if (NGX_HAVE_KQUEUE)
#include <ngx_kqueue_module.h>
#endif
static ngx_int_t ngx_aio_init(ngx_cycle_t *cycle);
static void ngx_aio_done(ngx_cycle_t *cycle);
static ngx_int_t ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags);
static ngx_int_t ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags);
static ngx_int_t ngx_aio_del_connection(ngx_connection_t *c, u_int flags);
static ngx_int_t ngx_aio_process_events(ngx_cycle_t *cycle);
ngx_os_io_t ngx_os_aio = {
ngx_aio_read,
ngx_aio_read_chain,
ngx_aio_write,
ngx_aio_write_chain,
0
};
static ngx_str_t aio_name = ngx_string("aio");
ngx_event_module_t ngx_aio_module_ctx = {
&aio_name,
NULL, /* create configuration */
NULL, /* init configuration */
{
ngx_aio_add_event, /* add an event */
ngx_aio_del_event, /* delete an event */
NULL, /* enable an event */
NULL, /* disable an event */
NULL, /* add an connection */
ngx_aio_del_connection, /* delete an connection */
NULL, /* process the changes */
ngx_aio_process_events, /* process the events */
ngx_aio_init, /* init the events */
ngx_aio_done /* done the events */
}
};
ngx_module_t ngx_aio_module = {
NGX_MODULE_V1,
&ngx_aio_module_ctx, /* module context */
NULL, /* module directives */
NGX_EVENT_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
#if (NGX_HAVE_KQUEUE)
static ngx_int_t
ngx_aio_init(ngx_cycle_t *cycle)
{
if (ngx_kqueue_module_ctx.actions.init(cycle) == NGX_ERROR) {
return NGX_ERROR;
}
ngx_io = ngx_os_aio;
ngx_event_flags = NGX_USE_AIO_EVENT;
ngx_event_actions = ngx_aio_module_ctx.actions;
return NGX_OK;
}
static void
ngx_aio_done(ngx_cycle_t *cycle)
{
ngx_kqueue_module_ctx.actions.done(cycle);
}
/* the event adding and deleting are needed for the listening sockets */
static ngx_int_t
ngx_aio_add_event(ngx_event_t *ev, int event, u_int flags)
{
return ngx_kqueue_module_ctx.actions.add(ev, event, flags);
}
static ngx_int_t
ngx_aio_del_event(ngx_event_t *ev, int event, u_int flags)
{
return ngx_kqueue_module_ctx.actions.del(ev, event, flags);
}
static ngx_int_t
ngx_aio_del_connection(ngx_connection_t *c, u_int flags)
{
int rc;
if (c->read->active == 0 && c->write->active == 0) {
return NGX_OK;
}
if (flags & NGX_CLOSE_EVENT) {
return NGX_OK;
}
rc = aio_cancel(c->fd, NULL);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_cancel: %d", rc);
if (rc == AIO_CANCELED) {
c->read->active = c->write->active = 0;
return NGX_OK;
}
if (rc == AIO_ALLDONE) {
c->read->active = c->write->active = 0;
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"aio_cancel() returned AIO_ALLDONE");
return NGX_OK;
}
if (rc == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
"aio_cancel() failed");
return NGX_ERROR;
}
if (rc == AIO_NOTCANCELED) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"aio_cancel() returned AIO_NOTCANCELED");
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t
ngx_aio_process_events(ngx_cycle_t *cycle)
{
return ngx_kqueue_module_ctx.actions.process_events(cycle);
}
#endif /* NGX_HAVE_KQUEUE */
#if 0
/* 1 */
int ngx_posix_aio_process_events(ngx_log_t *log)
{
listen via SIGIO;
aio_* via SIGxxx;
sigsuspend()/sigwaitinfo()/sigtimedwait();
}
/* 2 */
int ngx_posix_aio_process_events(ngx_log_t *log)
{
unmask signal
listen via SIGIO;
/* BUG: SIGIO can be delivered before aio_*() */
aio_suspend()/aiowait()/aio_waitcomplete() with timeout
mask signal
if (ngx_socket_errno == NGX_EINTR)
look listen
select()/accept() nb listen sockets
else
aio
}
/* 3 */
int ngx_posix_aio_process_events(ngx_log_t *log)
{
#if 0
unmask signal
/* BUG: AIO signal can be delivered before select() */
select(listen);
mask signal
#endif
pselect(listen, mask);
if (ngx_socket_errno == NGX_EINTR)
look ready array
}
void aio_sig_handler(int signo, siginfo_t *siginfo, void *context)
{
push siginfo->si_value.sival_ptr
}
#endif
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