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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include <assert.h>
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23
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24 #include "uv.h"
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25 #include "internal.h"
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26 #include "atomicops-inl.h"
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27 #include "handle-inl.h"
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28 #include "req-inl.h"
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29
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30
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31 void uv__async_endgame(uv_loop_t* loop, uv_async_t* handle) {
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32 if (handle->flags & UV_HANDLE_CLOSING &&
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33 !handle->async_sent) {
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34 assert(!(handle->flags & UV_HANDLE_CLOSED));
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35 uv__handle_close(handle);
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36 }
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37 }
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38
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39
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40 int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb) {
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41 uv_req_t* req;
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42
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43 uv__handle_init(loop, (uv_handle_t*) handle, UV_ASYNC);
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44 handle->async_sent = 0;
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45 handle->async_cb = async_cb;
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46
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47 req = &handle->async_req;
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48 UV_REQ_INIT(req, UV_WAKEUP);
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49 req->data = handle;
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50
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51 uv__handle_start(handle);
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52
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53 return 0;
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54 }
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55
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56
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57 void uv__async_close(uv_loop_t* loop, uv_async_t* handle) {
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58 if (!((uv_async_t*)handle)->async_sent) {
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59 uv__want_endgame(loop, (uv_handle_t*) handle);
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60 }
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61
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62 uv__handle_closing(handle);
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63 }
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64
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65
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66 int uv_async_send(uv_async_t* handle) {
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67 uv_loop_t* loop = handle->loop;
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68
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69 if (handle->type != UV_ASYNC) {
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70 /* Can't set errno because that's not thread-safe. */
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71 return -1;
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72 }
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73
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74 /* The user should make sure never to call uv_async_send to a closing or
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75 * closed handle. */
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76 assert(!(handle->flags & UV_HANDLE_CLOSING));
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77
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78 if (!uv__atomic_exchange_set(&handle->async_sent)) {
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79 POST_COMPLETION_FOR_REQ(loop, &handle->async_req);
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80 }
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81
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82 return 0;
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83 }
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84
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85
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86 void uv__process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle,
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87 uv_req_t* req) {
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88 assert(handle->type == UV_ASYNC);
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89 assert(req->type == UV_WAKEUP);
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90
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91 handle->async_sent = 0;
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92
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93 if (handle->flags & UV_HANDLE_CLOSING) {
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94 uv__want_endgame(loop, (uv_handle_t*)handle);
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95 } else if (handle->async_cb != NULL) {
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96 handle->async_cb(handle);
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97 }
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98 }
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