1/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22#include "uv.h"
23#include "uv/tree.h"
24#include "internal.h"
25#include "heap-inl.h"
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29
30int uv_loop_init(uv_loop_t* loop) {
31 uv__loop_internal_fields_t* lfields;
32 void* saved_data;
33 int err;
34
35
36 saved_data = loop->data;
37 memset(loop, 0, sizeof(*loop));
38 loop->data = saved_data;
39
40 lfields = (uv__loop_internal_fields_t*) uv__calloc(1, sizeof(*lfields));
41 if (lfields == NULL)
42 return UV_ENOMEM;
43 loop->internal_fields = lfields;
44
45 err = uv_mutex_init(&lfields->loop_metrics.lock);
46 if (err)
47 goto fail_metrics_mutex_init;
48
49 heap_init((struct heap*) &loop->timer_heap);
50 QUEUE_INIT(&loop->wq);
51 QUEUE_INIT(&loop->idle_handles);
52 QUEUE_INIT(&loop->async_handles);
53 QUEUE_INIT(&loop->check_handles);
54 QUEUE_INIT(&loop->prepare_handles);
55 QUEUE_INIT(&loop->handle_queue);
56
57 loop->active_handles = 0;
58 loop->active_reqs.count = 0;
59 loop->nfds = 0;
60 loop->watchers = NULL;
61 loop->nwatchers = 0;
62 QUEUE_INIT(&loop->pending_queue);
63 QUEUE_INIT(&loop->watcher_queue);
64
65 loop->closing_handles = NULL;
66 uv__update_time(loop);
67 loop->async_io_watcher.fd = -1;
68 loop->async_wfd = -1;
69 loop->signal_pipefd[0] = -1;
70 loop->signal_pipefd[1] = -1;
71 loop->backend_fd = -1;
72 loop->emfile_fd = -1;
73
74 loop->timer_counter = 0;
75 loop->stop_flag = 0;
76
77 err = uv__platform_loop_init(loop);
78 if (err)
79 goto fail_platform_init;
80
81 uv__signal_global_once_init();
82 err = uv_signal_init(loop, &loop->child_watcher);
83 if (err)
84 goto fail_signal_init;
85
86 uv__handle_unref(&loop->child_watcher);
87 loop->child_watcher.flags |= UV_HANDLE_INTERNAL;
88 QUEUE_INIT(&loop->process_handles);
89
90 err = uv_rwlock_init(&loop->cloexec_lock);
91 if (err)
92 goto fail_rwlock_init;
93
94 err = uv_mutex_init(&loop->wq_mutex);
95 if (err)
96 goto fail_mutex_init;
97
98 err = uv_async_init(loop, &loop->wq_async, uv__work_done);
99 if (err)
100 goto fail_async_init;
101
102 uv__handle_unref(&loop->wq_async);
103 loop->wq_async.flags |= UV_HANDLE_INTERNAL;
104
105 return 0;
106
107fail_async_init:
108 uv_mutex_destroy(&loop->wq_mutex);
109
110fail_mutex_init:
111 uv_rwlock_destroy(&loop->cloexec_lock);
112
113fail_rwlock_init:
114 uv__signal_loop_cleanup(loop);
115
116fail_signal_init:
117 uv__platform_loop_delete(loop);
118
119fail_platform_init:
120 uv_mutex_destroy(&lfields->loop_metrics.lock);
121
122fail_metrics_mutex_init:
123 uv__free(lfields);
124 loop->internal_fields = NULL;
125
126 uv__free(loop->watchers);
127 loop->nwatchers = 0;
128 return err;
129}
130
131
132int uv_loop_fork(uv_loop_t* loop) {
133 int err;
134 unsigned int i;
135 uv__io_t* w;
136
137 err = uv__io_fork(loop);
138 if (err)
139 return err;
140
141 err = uv__async_fork(loop);
142 if (err)
143 return err;
144
145 err = uv__signal_loop_fork(loop);
146 if (err)
147 return err;
148
149 /* Rearm all the watchers that aren't re-queued by the above. */
150 for (i = 0; i < loop->nwatchers; i++) {
151 w = loop->watchers[i];
152 if (w == NULL)
153 continue;
154
155 if (w->pevents != 0 && QUEUE_EMPTY(&w->watcher_queue)) {
156 w->events = 0; /* Force re-registration in uv__io_poll. */
157 QUEUE_INSERT_TAIL(&loop->watcher_queue, &w->watcher_queue);
158 }
159 }
160
161 return 0;
162}
163
164
165void uv__loop_close(uv_loop_t* loop) {
166 uv__loop_internal_fields_t* lfields;
167
168 uv__signal_loop_cleanup(loop);
169 uv__platform_loop_delete(loop);
170 uv__async_stop(loop);
171
172 if (loop->emfile_fd != -1) {
173 uv__close(loop->emfile_fd);
174 loop->emfile_fd = -1;
175 }
176
177 if (loop->backend_fd != -1) {
178 uv__close(loop->backend_fd);
179 loop->backend_fd = -1;
180 }
181
182 uv_mutex_lock(&loop->wq_mutex);
183 assert(QUEUE_EMPTY(&loop->wq) && "thread pool work queue not empty!");
184 assert(!uv__has_active_reqs(loop));
185 uv_mutex_unlock(&loop->wq_mutex);
186 uv_mutex_destroy(&loop->wq_mutex);
187
188 /*
189 * Note that all thread pool stuff is finished at this point and
190 * it is safe to just destroy rw lock
191 */
192 uv_rwlock_destroy(&loop->cloexec_lock);
193
194#if 0
195 assert(QUEUE_EMPTY(&loop->pending_queue));
196 assert(QUEUE_EMPTY(&loop->watcher_queue));
197 assert(loop->nfds == 0);
198#endif
199
200 uv__free(loop->watchers);
201 loop->watchers = NULL;
202 loop->nwatchers = 0;
203
204 lfields = uv__get_internal_fields(loop);
205 uv_mutex_destroy(&lfields->loop_metrics.lock);
206 uv__free(lfields);
207 loop->internal_fields = NULL;
208}
209
210
211int uv__loop_configure(uv_loop_t* loop, uv_loop_option option, va_list ap) {
212 uv__loop_internal_fields_t* lfields;
213
214 lfields = uv__get_internal_fields(loop);
215 if (option == UV_METRICS_IDLE_TIME) {
216 lfields->flags |= UV_METRICS_IDLE_TIME;
217 return 0;
218 }
219
220 if (option != UV_LOOP_BLOCK_SIGNAL)
221 return UV_ENOSYS;
222
223 if (va_arg(ap, int) != SIGPROF)
224 return UV_EINVAL;
225
226 loop->flags |= UV_LOOP_BLOCK_SIGPROF;
227 return 0;
228}
229