Mercurial > hg > nginx
diff src/os/unix/ngx_aio_read.c @ 93:738fe44c70d5
nginx-0.0.1-2003-05-21-17:28:21 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 21 May 2003 13:28:21 +0000 |
parents | |
children | 6dfda4cf5200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/unix/ngx_aio_read.c Wed May 21 13:28:21 2003 +0000 @@ -0,0 +1,110 @@ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_aio.h> + +#if (HAVE_KQUEUE) +#include <ngx_kqueue_module.h> +#endif + + +/* + The data is ready - 3 syscalls: + aio_read(), aio_error(), aio_return() + The data is not ready - 4 (kqueue) or 5 syscalls: + aio_read(), aio_error(), notifiction, + aio_error(), aio_return() + aio_cancel(), aio_error() +*/ + + +ssize_t ngx_aio_read(ngx_connection_t *c, char *buf, size_t size) +{ + int rc, first, canceled; + ngx_event_t *ev; + + ev = c->read; + + canceled = 0; + + if (ev->timedout) { + ngx_set_socket_errno(NGX_ETIMEDOUT); + ngx_log_error(NGX_LOG_ERR, ev->log, 0, "aio_read() timed out"); + + rc = aio_cancel(c->fd, &ev->aiocb); + if (rc == -1) { + ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, + "aio_cancel() failed"); + return NGX_ERROR; + } + + ngx_log_debug(ev->log, "aio_cancel: %d" _ rc); + + canceled = 1; + + ev->ready = 1; + } + + first = 0; + + if (!ev->ready) { + ngx_memzero(&ev->aiocb, sizeof(struct aiocb)); + + ev->aiocb.aio_fildes = c->fd; + ev->aiocb.aio_buf = buf; + ev->aiocb.aio_nbytes = size; + +#if (HAVE_KQUEUE) + ev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue; + ev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT; + ev->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev; +#endif + + if (aio_read(&ev->aiocb) == -1) { + ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, + "aio_read() failed"); + return NGX_ERROR; + } + + ngx_log_debug(ev->log, "aio_read: OK"); + + ev->active = 1; + first = 1; + } + + ev->ready = 0; + + rc = aio_error(&ev->aiocb); + if (rc == -1) { + ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, "aio_error() failed"); + return NGX_ERROR; + } + + if (rc != 0) { + if (rc == NGX_EINPROGRESS) { + if (!first) { + ngx_log_error(NGX_LOG_CRIT, ev->log, rc, + "aio_read() still in progress"); + } + return NGX_AGAIN; + } + + if (rc == NGX_ECANCELED && canceled) { + return NGX_ERROR; + } + + ngx_log_error(NGX_LOG_CRIT, ev->log, rc, "aio_read() failed"); + return NGX_ERROR; + } + + rc = aio_return(&ev->aiocb); + if (rc == -1) { + ngx_log_error(NGX_LOG_CRIT, ev->log, ngx_errno, "aio_return() failed"); + + return NGX_ERROR; + } + + ngx_log_debug(ev->log, "aio_read: %d" _ rc); + + return rc; +}