Mercurial > dovecot > core-2.2

annotate src/lib/ioloop-kqueue.c @ 23007:36e01285b5b8

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lib: buffer - Improve header comment for buffer_insert() and buffer_delete().
author Stephan Bosch <stephan.bosch@dovecot.fi>
date Mon, 18 Mar 2019 00:52:37 +0100
parents 25d3a72cdf20
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * BSD kqueue() based ioloop handler.
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3 *
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4 * Copyright (c) 2005 Vaclav Haisman <v.haisman@sh.cvut.cz>
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5 */
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6
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7 #include "lib.h"
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8
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9 #ifdef IOLOOP_KQUEUE
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10
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11 #include "array.h"
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12 #include "fd-close-on-exec.h"
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13 #include "ioloop-private.h"
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14
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15 #include <unistd.h>
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16 #include <fcntl.h>
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17 #include <sys/types.h>
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18 #include <sys/event.h>
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19 #include <sys/time.h>
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20
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21 /* kevent.udata's type just has to be different in NetBSD than in
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22 FreeBSD and OpenBSD.. */
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23 #ifdef __NetBSD__
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24 # define MY_EV_SET(a, b, c, d, e, f, g) \
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25 EV_SET(a, b, c, d, e, f, (intptr_t)g)
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26 #else
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27 # define MY_EV_SET(a, b, c, d, e, f, g) \
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28 EV_SET(a, b, c, d, e, f, g)
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29 #endif
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30
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31 struct ioloop_handler_context {
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32 int kq;
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33
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34 unsigned int deleted_count;
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35 ARRAY(struct kevent) events;
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36 };
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37
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38 void io_loop_handler_init(struct ioloop *ioloop, unsigned int initial_fd_count)
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39 {
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40 struct ioloop_handler_context *ctx;
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41
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42 ioloop->handler_context = ctx = i_new(struct ioloop_handler_context, 1);
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43 ctx->kq = kqueue();
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44 if (ctx->kq < 0)
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45 i_fatal("kqueue() in io_loop_handler_init() failed: %m");
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46 fd_close_on_exec(ctx->kq, TRUE);
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47
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48 i_array_init(&ctx->events, initial_fd_count);
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49 }
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50
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51 void io_loop_handler_deinit(struct ioloop *ioloop)
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52 {
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53 if (close(ioloop->handler_context->kq) < 0)
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54 i_error("close(kqueue) in io_loop_handler_deinit() failed: %m");
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55 array_free(&ioloop->handler_context->events);
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56 i_free(ioloop->handler_context);
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57 }
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58
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59 void io_loop_handle_add(struct io_file *io)
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60 {
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61 struct ioloop_handler_context *ctx = io->io.ioloop->handler_context;
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62 struct kevent ev;
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63
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64 if ((io->io.condition & (IO_READ | IO_ERROR)) != 0) {
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65 MY_EV_SET(&ev, io->fd, EVFILT_READ, EV_ADD, 0, 0, io);
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66 if (kevent(ctx->kq, &ev, 1, NULL, 0, NULL) < 0)
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67 i_panic("kevent(EV_ADD, READ, %d) failed: %m", io->fd);
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68 }
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69 if ((io->io.condition & IO_WRITE) != 0) {
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70 MY_EV_SET(&ev, io->fd, EVFILT_WRITE, EV_ADD, 0, 0, io);
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71 if (kevent(ctx->kq, &ev, 1, NULL, 0, NULL) < 0)
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72 i_panic("kevent(EV_ADD, WRITE, %d) failed: %m", io->fd);
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73 }
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74
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75 /* allow kevent() to return the maximum number of events
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76 by keeping space allocated for each handle */
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77 if (ctx->deleted_count > 0)
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78 ctx->deleted_count--;
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79 else
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80 array_append_zero(&ctx->events);
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81 }
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82
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83 void io_loop_handle_remove(struct io_file *io, bool closed)
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84 {
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85 struct ioloop_handler_context *ctx = io->io.ioloop->handler_context;
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86 struct kevent ev;
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87
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88 i_assert(io->io.condition != 0);
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89 if ((io->io.condition & (IO_READ | IO_ERROR)) != 0 && !closed) {
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90 MY_EV_SET(&ev, io->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
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91 if (kevent(ctx->kq, &ev, 1, NULL, 0, NULL) < 0)
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92 i_error("kevent(EV_DELETE, %d) failed: %m", io->fd);
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93 }
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94 if ((io->io.condition & IO_WRITE) != 0 && !closed) {
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95 MY_EV_SET(&ev, io->fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
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96 if (kevent(ctx->kq, &ev, 1, NULL, 0, NULL) < 0)
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97 i_error("kevent(EV_DELETE, %d) failed: %m", io->fd);
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98 }
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99 io->io.condition = 0;
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100
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101 /* since we're not freeing memory in any case, just increase
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102 deleted counter so next handle_add() can just decrease it
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103 insteading of appending to the events array */
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104 ctx->deleted_count++;
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105
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106 i_assert(io->refcount > 0);
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107 if (--io->refcount == 0)
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108 i_free(io);
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109 }
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110
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111 void io_loop_handler_run_internal(struct ioloop *ioloop)
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112 {
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113 struct ioloop_handler_context *ctx = ioloop->handler_context;
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114 struct kevent *events;
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115 const struct kevent *event;
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116 struct timeval tv;
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117 struct timespec ts;
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118 struct io_file *io;
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119 unsigned int events_count;
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120 int ret, i, msecs;
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121
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122 /* get the time left for next timeout task */
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123 msecs = io_loop_get_wait_time(ioloop, &tv);
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124 ts.tv_sec = tv.tv_sec;
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125 ts.tv_nsec = tv.tv_usec * 1000;
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126
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127 /* wait for events */
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128 events = array_get_modifiable(&ctx->events, &events_count);
20943
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
129
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
130 if (events_count > 0) {
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
131 ret = kevent (ctx->kq, NULL, 0, events, events_count, &ts);
22152
25d3a72cdf20 lib: ioloop-kqueue - Improve kevent() panic log message
Timo Sirainen <timo.sirainen@dovecot.fi>
parents: 20943
diff changeset
132 if (ret < 0 && errno != EINTR) {
25d3a72cdf20 lib: ioloop-kqueue - Improve kevent() panic log message
Timo Sirainen <timo.sirainen@dovecot.fi>
parents: 20943
diff changeset
133 i_panic("kevent(events=%u, ts=%ld.%u) failed: %m",
25d3a72cdf20 lib: ioloop-kqueue - Improve kevent() panic log message
Timo Sirainen <timo.sirainen@dovecot.fi>
parents: 20943
diff changeset
134 events_count, (long)ts.tv_sec,
25d3a72cdf20 lib: ioloop-kqueue - Improve kevent() panic log message
Timo Sirainen <timo.sirainen@dovecot.fi>
parents: 20943
diff changeset
135 (unsigned int)ts.tv_nsec);
25d3a72cdf20 lib: ioloop-kqueue - Improve kevent() panic log message
Timo Sirainen <timo.sirainen@dovecot.fi>
parents: 20943
diff changeset
136 }
20943
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
137 } else {
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
138 if (msecs < 0)
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
139 i_panic("BUG: No IOs or timeouts set. Not waiting for infinity.");
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
140 usleep(msecs * 1000);
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
141 ret = 0;
5d1efb601d6c lib: Fix kqueue io_loop_get_wait_time usage
Aki Tuomi <aki.tuomi@dovecot.fi>
parents: 17307
diff changeset
142 }
3749
194295062e5e Added kqueue support. Patch by Vaclav Haisman.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
143
4579
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
144 /* reference all IOs */
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
145 for (i = 0; i < ret; i++) {
4737
fd0d7e9e0e72 Removed compiler warnings with NetBSD.
Timo Sirainen <tss@iki.fi>
parents: 4596
diff changeset
146 io = (void *)events[i].udata;
16777
c8b1e5833a28 ioloop-kqueue: Added assert
Timo Sirainen <tss@iki.fi>
parents: 14920
diff changeset
147 i_assert(io->refcount > 0);
4579
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
148 io->refcount++;
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
149 }
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
150
4580
4644b3038b9a Reference IOs before calling timeout handlers, in case they call
Timo Sirainen <tss@iki.fi>
parents: 4579
diff changeset
151 /* execute timeout handlers */
7098
becdf2eacdce Use priority queue to implement timeout handling. Added timeout_reset().
Timo Sirainen <tss@iki.fi>
parents: 5682
diff changeset
152 io_loop_handle_timeouts(ioloop);
4580
4644b3038b9a Reference IOs before calling timeout handlers, in case they call
Timo Sirainen <tss@iki.fi>
parents: 4579
diff changeset
153
4576
Timo Sirainen <tss@iki.fi>
parents: 4574
diff changeset
154 for (i = 0; i < ret; i++) {
Timo Sirainen <tss@iki.fi>
parents: 4574
diff changeset
155 /* io_loop_handle_add() may cause events array reallocation,
Timo Sirainen <tss@iki.fi>
parents: 4574
diff changeset
156 so we have use array_idx() */
Timo Sirainen <tss@iki.fi>
parents: 4574
diff changeset
157 event = array_idx(&ctx->events, i);
4579
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
158 io = (void *)event->udata;
3749
194295062e5e Added kqueue support. Patch by Vaclav Haisman.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
159
4579
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
160 /* callback is NULL if io_remove() was already called */
12497
1bac1c09201a ioloop: Added support for per-io/timeout callback log prefix automation.
Timo Sirainen <tss@iki.fi>
parents: 10067
diff changeset
161 if (io->io.callback != NULL)
1bac1c09201a ioloop: Added support for per-io/timeout callback log prefix automation.
Timo Sirainen <tss@iki.fi>
parents: 10067
diff changeset
162 io_loop_call_io(&io->io);
4579
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
163
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
164 i_assert(io->refcount > 0);
40b353def38c OK, so the original kqueue code wasn't actually broken, but it could have
Timo Sirainen <tss@iki.fi>
parents: 4577
diff changeset
165 if (--io->refcount == 0)
5248
12ac5f685814 Various cleanups to ioloop code.
Timo Sirainen <tss@iki.fi>
parents: 4863
diff changeset
166 i_free(io);
3958
3e9b43d0cd80 kqueue updates. Patch by Vaclav Haisman
Timo Sirainen <tss@iki.fi>
parents: 3781
diff changeset
167 }
3749
194295062e5e Added kqueue support. Patch by Vaclav Haisman.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
168 }
194295062e5e Added kqueue support. Patch by Vaclav Haisman.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
169
194295062e5e Added kqueue support. Patch by Vaclav Haisman.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
170 #endif