afaf2312 |
1 | /* |
2 | * mthread.c |
3 | * - multithreading layer |
4 | */ |
5 | /* |
6 | * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 2, or (at your option) |
11 | * any later version. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program; if not, write to the Free Software Foundation, |
20 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
21 | */ |
22 | |
23 | #include "adns-mt.h" |
24 | |
25 | struct adns_mt__state { |
26 | adns_state state; |
27 | pthread_t executor; |
28 | pthread_mutex_t mutex; |
29 | }; |
30 | |
31 | struct adns_mt__query { |
32 | adns_query query; |
33 | adns_answer *answer; |
34 | void *context; |
35 | pthread_cond_t cond; |
36 | }; |
37 | |
38 | int adns_mt_init(adns_mt_state *newstate_r, adns_initflags flags, FILE *diagfile) { |
39 | adns_mt_state adts; |
40 | int r; |
41 | |
42 | adts= malloc(sizeof(*adts)); if (!adts) return errno; |
43 | r= pthread_mutex_init(&adts->mutex,0); assert(!r); |
44 | r= pthread_mutex_lock(&adts->mutex); assert(!r); |
45 | r= pthread_create(&adts->executor,0,executor_start,adts); |
46 | if (r) { pthread_mutex_destroy(&adts->mutex); free(adts); return r; } |
47 | |
48 | |
49 | |
50 | int adns_mt_init_strcfg(adns_mt_state *newstate_r, adns_initflags flags, |
51 | FILE *diagfile /*0=>discard*/, const char *configtext); |
52 | |
53 | int adns_mt_synchronous(adns_mt_state adts, |
54 | const char *owner, |
55 | adns_rrtype type, |
56 | adns_queryflags flags, |
57 | adns_answer **answer_r); |
58 | |
59 | int adns_mt_submit(adns_mt_state adts, |
60 | const char *owner, |
61 | adns_rrtype type, |
62 | adns_queryflags flags, |
63 | void *context, |
64 | adns_mt_query *query_r); |
65 | |
66 | int adns_mt_wait(adns_mt_state adts, |
67 | adns_mt_query *query_io, |
68 | adns_answer **answer_r, |
69 | void **context_r); |
70 | |
71 | void adns_mt_cancel(adns_mt_query query); |
72 | /* Do not cancel a query while another thread is waiting for it ! */ |
73 | |
74 | void adns_mt_finish(adns_mt_state); |
75 | /* You may call this even if you have queries outstanding; |
76 | * they will be cancelled. NB the comment about _mt_cancel above. |
77 | */ |