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 31 void 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 40 int 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(req, UV_WAKEUP); 49 req->data = handle; 50 51 uv__handle_start(handle); 52 53 return 0; 54 } 55 56 57 void uv_async_close(uv_loop_t* loop, uv_async_t* handle) { 58 if (!((uv_async_t*)handle)->async_sent) { 59 uv_want_endgame(loop, (uv_handle_t*) handle); 60 } 61 62 uv__handle_closing(handle); 63 } 64 65 66 int uv_async_send(uv_async_t* handle) { 67 uv_loop_t* loop = handle->loop; 68 69 if (handle->type != UV_ASYNC) { 70 /* Can't set errno because that's not thread-safe. */ 71 return -1; 72 } 73 74 /* The user should make sure never to call uv_async_send to a closing or 75 * closed handle. */ 76 assert(!(handle->flags & UV_HANDLE_CLOSING)); 77 78 if (!uv__atomic_exchange_set(&handle->async_sent)) { 79 POST_COMPLETION_FOR_REQ(loop, &handle->async_req); 80 } 81 82 return 0; 83 } 84 85 86 void uv_process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle, 87 uv_req_t* req) { 88 assert(handle->type == UV_ASYNC); 89 assert(req->type == UV_WAKEUP); 90 91 handle->async_sent = 0; 92 93 if (handle->flags & UV_HANDLE_CLOSING) { 94 uv_want_endgame(loop, (uv_handle_t*)handle); 95 } else if (handle->async_cb != NULL) { 96 handle->async_cb(handle); 97 } 98 } 99