/src/libwebsockets/lib/event-libs/poll/poll.c
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1 | | /* |
2 | | * libwebsockets - small server side websockets and web server implementation |
3 | | * |
4 | | * Copyright (C) 2010 - 2021 Andy Green <andy@warmcat.com> |
5 | | * |
6 | | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | | * of this software and associated documentation files (the "Software"), to |
8 | | * deal in the Software without restriction, including without limitation the |
9 | | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
10 | | * sell copies of the Software, and to permit persons to whom the Software is |
11 | | * furnished to do so, subject to the following conditions: |
12 | | * |
13 | | * The above copyright notice and this permission notice shall be included in |
14 | | * all copies or substantial portions of the Software. |
15 | | * |
16 | | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
19 | | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
20 | | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
21 | | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
22 | | * IN THE SOFTWARE |
23 | | */ |
24 | | |
25 | | #include <private-lib-core.h> |
26 | | #include "private-lib-event-libs-poll.h" |
27 | | |
28 | | static int |
29 | | elops_foreign_thread_poll(struct lws_context *cx, int tsi) |
30 | 0 | { |
31 | 0 | struct lws_context_per_thread *pt = &cx->pt[tsi]; |
32 | 0 | volatile struct lws_context_per_thread *vpt = |
33 | 0 | (volatile struct lws_context_per_thread *)pt; |
34 | | |
35 | | /* |
36 | | * To avoid mandating a specific threading library, we can check |
37 | | * probabilistically by seeing if the lws default wait is still asleep |
38 | | * at the time we are checking, if it is then we cannot be being called |
39 | | * by the event loop loop thread. |
40 | | */ |
41 | |
|
42 | 0 | return vpt->inside_poll; |
43 | 0 | } |
44 | | |
45 | | struct lws_event_loop_ops event_loop_ops_poll = { |
46 | | .name = "poll", |
47 | | |
48 | | .foreign_thread = elops_foreign_thread_poll, |
49 | | |
50 | | .flags = LELOF_ISPOLL, |
51 | | }; |
52 | | |
53 | | const lws_plugin_evlib_t evlib_poll = { |
54 | | .hdr = { |
55 | | "poll", |
56 | | "lws_evlib_plugin", |
57 | | "n/a", |
58 | | LWS_PLUGIN_API_MAGIC |
59 | | }, |
60 | | |
61 | | .ops = &event_loop_ops_poll |
62 | | }; |