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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_aio.h>
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11
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12 #if (HAVE_KQUEUE)
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13 #include <ngx_kqueue_module.h>
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14 #endif
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15
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16
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17 /*
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18 * the ready data requires 3 syscalls:
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19 * aio_write(), aio_error(), aio_return()
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20 * the non-ready data requires 4 (kqueue) or 5 syscalls:
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21 * aio_write(), aio_error(), notifiction, aio_error(), aio_return()
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22 * timeout, aio_cancel(), aio_error()
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23 */
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24
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25 ssize_t ngx_aio_read(ngx_connection_t *c, u_char *buf, size_t size)
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26 {
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27 int n;
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28 ngx_event_t *rev;
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29
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30 rev = c->read;
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31
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32 if (!rev->ready) {
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33 ngx_log_error(NGX_LOG_ALERT, c->log, 0, "second aio post");
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34 return NGX_AGAIN;
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35 }
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36
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37 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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38 "rev->complete: %d", rev->complete);
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39 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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40 "aio size: %d", size);
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41
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42 if (!rev->complete) {
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43 ngx_memzero(&rev->aiocb, sizeof(struct aiocb));
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44
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45 rev->aiocb.aio_fildes = c->fd;
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46 rev->aiocb.aio_buf = buf;
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47 rev->aiocb.aio_nbytes = size;
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48
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49 #if (HAVE_KQUEUE)
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50 rev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
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51 rev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
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52 rev->aiocb.aio_sigevent.sigev_value.sigval_ptr = rev;
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53 #endif
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54
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55 if (aio_read(&rev->aiocb) == -1) {
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56 ngx_log_error(NGX_LOG_CRIT, rev->log, ngx_errno,
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57 "aio_read() failed");
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58 rev->error = 1;
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59 return NGX_ERROR;
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60 }
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61
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62 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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63 "aio_read: #%d OK", c->fd);
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64
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65 rev->active = 1;
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66 rev->ready = 0;
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67 }
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68
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69 rev->complete = 0;
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70
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71 n = aio_error(&rev->aiocb);
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72 if (n == -1) {
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73 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, "aio_error() failed");
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74 rev->error = 1;
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75 return NGX_ERROR;
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76 }
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77
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78 if (n != 0) {
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79 if (n == NGX_EINPROGRESS) {
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80 if (rev->ready) {
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81 ngx_log_error(NGX_LOG_ALERT, c->log, n,
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82 "aio_read() still in progress");
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83 rev->ready = 0;
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84 }
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85 return NGX_AGAIN;
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86 }
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87
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88 ngx_log_error(NGX_LOG_CRIT, c->log, n, "aio_read() failed");
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89 rev->error = 1;
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90 rev->ready = 0;
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91 return NGX_ERROR;
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92 }
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93
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94 n = aio_return(&rev->aiocb);
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95 if (n == -1) {
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96 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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97 "aio_return() failed");
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98
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99 rev->error = 1;
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100 rev->ready = 0;
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101 return NGX_ERROR;
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102 }
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103
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104 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, rev->log, 0,
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105 "aio_read: #%d %d", c->fd, n);
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106
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107 if (n == 0) {
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108 rev->eof = 1;
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109 rev->ready = 0;
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110 } else {
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111 rev->ready = 1;
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112 }
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113
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114 rev->active = 0;
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115
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116 return n;
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117 }
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