| 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 | */ |