Mercurial > hg > nginx
annotate src/os/unix/ngx_linux_aio_read.c @ 3777:cd04f652478c
update event flags after successful io_submit()
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 12 Oct 2010 12:11:11 +0000 |
| parents | 04cfc09b8b8d |
| children | 37da005a5808 |
| rev | line source |
|---|---|
| 3052 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_event.h> | |
| 10 | |
| 11 | |
| 12 extern int ngx_eventfd; | |
| 13 extern aio_context_t ngx_aio_ctx; | |
| 14 | |
| 15 | |
| 16 static void ngx_file_aio_event_handler(ngx_event_t *ev); | |
| 17 | |
| 18 | |
| 19 static long | |
| 20 io_submit(aio_context_t ctx, long n, struct iocb **paiocb) | |
| 21 { | |
| 22 return syscall(SYS_io_submit, ctx, n, paiocb); | |
| 23 } | |
| 24 | |
| 25 | |
| 26 ssize_t | |
| 27 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset, | |
| 28 ngx_pool_t *pool) | |
| 29 { | |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
30 long n; |
|
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
31 struct iocb *piocb[1]; |
|
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
32 ngx_event_t *ev; |
|
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
33 ngx_event_aio_t *aio; |
| 3052 | 34 |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
35 if (!ngx_file_aio) { |
| 3052 | 36 return ngx_read_file(file, buf, size, offset); |
| 37 } | |
| 38 | |
| 39 aio = file->aio; | |
| 40 | |
| 41 if (aio == NULL) { | |
| 42 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t)); | |
| 43 if (aio == NULL) { | |
| 44 return NGX_ERROR; | |
| 45 } | |
| 46 | |
| 47 aio->file = file; | |
| 48 aio->fd = file->fd; | |
| 49 aio->event.data = aio; | |
| 50 aio->event.ready = 1; | |
| 51 aio->event.log = file->log; | |
| 52 file->aio = aio; | |
| 53 } | |
| 54 | |
| 55 ev = &aio->event; | |
| 56 | |
| 57 if (!ev->ready) { | |
| 58 ngx_log_error(NGX_LOG_ALERT, file->log, 0, | |
| 59 "second aio post for \"%V\"", &file->name); | |
| 60 return NGX_AGAIN; | |
| 61 } | |
| 62 | |
| 63 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, | |
| 64 "aio complete:%d @%O:%z %V", | |
| 65 ev->complete, offset, size, &file->name); | |
| 66 | |
| 67 if (ev->complete) { | |
| 68 ev->active = 0; | |
| 69 ev->complete = 0; | |
| 70 | |
| 71 if (aio->res >= 0) { | |
| 72 ngx_set_errno(0); | |
| 73 return aio->res; | |
| 74 } | |
| 75 | |
| 76 ngx_set_errno(-aio->res); | |
| 77 return NGX_ERROR; | |
| 78 } | |
| 79 | |
| 80 ngx_memzero(&aio->aiocb, sizeof(struct iocb)); | |
| 81 | |
| 82 aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev; | |
| 83 aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD; | |
| 84 aio->aiocb.aio_fildes = file->fd; | |
| 85 aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf; | |
| 86 aio->aiocb.aio_nbytes = size; | |
| 87 aio->aiocb.aio_offset = offset; | |
| 88 aio->aiocb.aio_flags = IOCB_FLAG_RESFD; | |
| 89 aio->aiocb.aio_resfd = ngx_eventfd; | |
| 90 | |
| 91 ev->handler = ngx_file_aio_event_handler; | |
| 92 | |
| 93 piocb[0] = &aio->aiocb; | |
| 94 | |
| 95 n = io_submit(ngx_aio_ctx, 1, piocb); | |
| 96 | |
| 97 if (n == 1) { | |
|
3777
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
98 ev->active = 1; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
99 ev->ready = 0; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
100 ev->complete = 0; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
101 |
| 3052 | 102 return NGX_AGAIN; |
| 103 } | |
| 104 | |
| 105 n = -n; | |
| 106 | |
| 107 if (n == NGX_EAGAIN) { | |
| 108 return ngx_read_file(file, buf, size, offset); | |
| 109 } | |
| 110 | |
| 111 ngx_log_error(NGX_LOG_CRIT, file->log, n, | |
| 112 "io_submit(\"%V\") failed", &file->name); | |
| 113 | |
| 114 if (n == NGX_ENOSYS) { | |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
115 ngx_file_aio = 0; |
| 3052 | 116 return ngx_read_file(file, buf, size, offset); |
| 117 } | |
| 118 | |
| 119 return NGX_ERROR; | |
| 120 } | |
| 121 | |
| 122 | |
| 123 static void | |
| 124 ngx_file_aio_event_handler(ngx_event_t *ev) | |
| 125 { | |
| 126 ngx_event_aio_t *aio; | |
| 127 | |
| 128 aio = ev->data; | |
| 129 | |
| 130 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0, | |
| 131 "aio event handler fd:%d %V", aio->fd, &aio->file->name); | |
| 132 | |
| 133 aio->handler(ev); | |
| 134 } |