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28f540f4 | 1 | /* Demux messages sent on the signal port. |
f7a9f785 | 2 | Copyright (C) 1991-2016 Free Software Foundation, Inc. |
c84142e8 | 3 | This file is part of the GNU C Library. |
28f540f4 | 4 | |
c84142e8 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 9 | |
c84142e8 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
18 | |
19 | #include <hurd.h> | |
20 | #include <hurd/signal.h> | |
21 | #include <stddef.h> | |
22 | ||
23 | struct demux | |
24 | { | |
25 | struct demux *next; | |
26 | boolean_t (*demux) (mach_msg_header_t *inp, | |
27 | mach_msg_header_t *outp); | |
28 | }; | |
29 | ||
30 | struct demux *_hurd_msgport_demuxers = NULL; | |
31 | ||
32 | extern boolean_t __msg_server (mach_msg_header_t *inp, | |
33 | mach_msg_header_t *outp); | |
34 | ||
35 | static boolean_t | |
36 | msgport_server (mach_msg_header_t *inp, | |
37 | mach_msg_header_t *outp) | |
38 | { | |
39 | extern boolean_t _S_msg_server (mach_msg_header_t *inp, | |
40 | mach_msg_header_t *outp); | |
41 | extern boolean_t _S_exc_server (mach_msg_header_t *inp, | |
42 | mach_msg_header_t *outp); | |
43 | struct demux *d; | |
44 | ||
45 | for (d = _hurd_msgport_demuxers; d != NULL; d = d->next) | |
46 | if ((*d->demux) (inp, outp)) | |
47 | return 1; | |
48 | ||
49 | return (_S_exc_server (inp, outp) || | |
50 | _S_msg_server (inp, outp)); | |
51 | } | |
52 | ||
53 | /* This is the code that the signal thread runs. */ | |
54 | void | |
55 | _hurd_msgport_receive (void) | |
56 | { | |
57 | /* Get our own sigstate cached so we never again have to take a lock to | |
58 | fetch it. There is much code in hurdsig.c that operates with some | |
72e1a750 RM |
59 | sigstate lock held, which will deadlock with _hurd_thread_sigstate. |
60 | ||
61 | Furthermore, in the cthreads case this is the convenient spot | |
62 | to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init). */ | |
63 | ||
64 | _hurd_msgport_thread = _hurd_self_sigstate ()->thread; | |
28f540f4 RM |
65 | |
66 | while (1) | |
67 | (void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport); | |
68 | } |