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      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