xref: /libuv/src/unix/loop-watcher.c (revision 1b01b786)
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
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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
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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 "internal.h"
24 
25 #define UV_LOOP_WATCHER_DEFINE(name, type)                                    \
26   int uv_##name##_init(uv_loop_t* loop, uv_##name##_t* handle) {              \
27     uv__handle_init(loop, (uv_handle_t*)handle, UV_##type);                   \
28     handle->name##_cb = NULL;                                                 \
29     return 0;                                                                 \
30   }                                                                           \
31                                                                               \
32   int uv_##name##_start(uv_##name##_t* handle, uv_##name##_cb cb) {           \
33     if (uv__is_active(handle)) return 0;                                      \
34     if (cb == NULL) return UV_EINVAL;                                         \
35     uv__queue_insert_head(&handle->loop->name##_handles, &handle->queue);     \
36     handle->name##_cb = cb;                                                   \
37     uv__handle_start(handle);                                                 \
38     return 0;                                                                 \
39   }                                                                           \
40                                                                               \
41   int uv_##name##_stop(uv_##name##_t* handle) {                               \
42     if (!uv__is_active(handle)) return 0;                                     \
43     uv__queue_remove(&handle->queue);                                         \
44     uv__handle_stop(handle);                                                  \
45     return 0;                                                                 \
46   }                                                                           \
47                                                                               \
48   void uv__run_##name(uv_loop_t* loop) {                                      \
49     uv_##name##_t* h;                                                         \
50     struct uv__queue queue;                                                   \
51     struct uv__queue* q;                                                      \
52     uv__queue_move(&loop->name##_handles, &queue);                            \
53     while (!uv__queue_empty(&queue)) {                                        \
54       q = uv__queue_head(&queue);                                             \
55       h = uv__queue_data(q, uv_##name##_t, queue);                            \
56       uv__queue_remove(q);                                                    \
57       uv__queue_insert_tail(&loop->name##_handles, q);                        \
58       h->name##_cb(h);                                                        \
59     }                                                                         \
60   }                                                                           \
61                                                                               \
62   void uv__##name##_close(uv_##name##_t* handle) {                            \
63     uv_##name##_stop(handle);                                                 \
64   }
65 
66 UV_LOOP_WATCHER_DEFINE(prepare, PREPARE)
67 UV_LOOP_WATCHER_DEFINE(check, CHECK)
68 UV_LOOP_WATCHER_DEFINE(idle, IDLE)
69