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/src/win/async.c

http://github.com/joyent/libuv
C | 99 lines | 53 code | 23 blank | 23 comment | 9 complexity | d290f5b85a62edebe39050ccf47513a2 MD5 | raw file
 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 <assert.h>
23
24#include "uv.h"
25#include "internal.h"
26#include "atomicops-inl.h"
27#include "handle-inl.h"
28#include "req-inl.h"
29
30
31void uv_async_endgame(uv_loop_t* loop, uv_async_t* handle) {
32  if (handle->flags & UV__HANDLE_CLOSING &&
33      !handle->async_sent) {
34    assert(!(handle->flags & UV_HANDLE_CLOSED));
35    uv__handle_close(handle);
36  }
37}
38
39
40int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb) {
41  uv_req_t* req;
42
43  uv__handle_init(loop, (uv_handle_t*) handle, UV_ASYNC);
44  handle->async_sent = 0;
45  handle->async_cb = async_cb;
46
47  req = &handle->async_req;
48  uv_req_init(loop, req);
49  req->type = UV_WAKEUP;
50  req->data = handle;
51
52  uv__handle_start(handle);
53
54  return 0;
55}
56
57
58void uv_async_close(uv_loop_t* loop, uv_async_t* handle) {
59  if (!((uv_async_t*)handle)->async_sent) {
60    uv_want_endgame(loop, (uv_handle_t*) handle);
61  }
62
63  uv__handle_closing(handle);
64}
65
66
67int uv_async_send(uv_async_t* handle) {
68  uv_loop_t* loop = handle->loop;
69
70  if (handle->type != UV_ASYNC) {
71    /* Can't set errno because that's not thread-safe. */
72    return -1;
73  }
74
75  /* The user should make sure never to call uv_async_send to a closing */
76  /* or closed handle. */
77  assert(!(handle->flags & UV__HANDLE_CLOSING));
78
79  if (!uv__atomic_exchange_set(&handle->async_sent)) {
80    POST_COMPLETION_FOR_REQ(loop, &handle->async_req);
81  }
82
83  return 0;
84}
85
86
87void uv_process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle,
88    uv_req_t* req) {
89  assert(handle->type == UV_ASYNC);
90  assert(req->type == UV_WAKEUP);
91
92  handle->async_sent = 0;
93
94  if (!(handle->flags & UV__HANDLE_CLOSING)) {
95    handle->async_cb((uv_async_t*) handle, 0);
96  } else {
97    uv_want_endgame(loop, (uv_handle_t*)handle);
98  }
99}