2 * This file is part of PowerDNS or dnsdist.
3 * Copyright -- PowerDNS.COM B.V. and its contributors
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * In addition, for the avoidance of any doubt, permission is granted to
10 * link this program with OpenSSL and to (re)distribute the binaries
11 * produced as the result of such linking.
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.
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
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 #include "pdnsexception.hh"
30 extern bool g_singleThreaded;
34 pthread_mutex_t *d_lock;
37 Lock(pthread_mutex_t *lock) : d_lock(lock)
41 if((errno=pthread_mutex_lock(d_lock)))
42 throw PDNSException("error acquiring lock: "+stringerror());
49 pthread_mutex_unlock(d_lock);
55 pthread_rwlock_t *d_lock;
58 WriteLock(pthread_rwlock_t *lock) : d_lock(lock)
63 if((errno=pthread_rwlock_wrlock(d_lock))) {
64 throw PDNSException("error acquiring rwlock wrlock: "+stringerror());
72 pthread_rwlock_unlock(d_lock);
78 pthread_rwlock_t *d_lock;
82 TryWriteLock(pthread_rwlock_t *lock) : d_lock(lock)
84 if(g_singleThreaded) {
90 if((errno=pthread_rwlock_trywrlock(d_lock)) && errno!=EBUSY)
91 throw PDNSException("error acquiring rwlock tryrwlock: "+stringerror());
92 d_havelock=(errno==0);
100 pthread_rwlock_unlock(d_lock);
113 pthread_rwlock_t *d_lock;
117 TryReadLock(pthread_rwlock_t *lock) : d_lock(lock)
119 if(g_singleThreaded) {
124 if((errno=pthread_rwlock_tryrdlock(d_lock)) && errno!=EBUSY)
125 throw PDNSException("error acquiring rwlock tryrdlock: "+stringerror());
126 d_havelock=(errno==0);
134 pthread_rwlock_unlock(d_lock);
148 pthread_rwlock_t *d_lock;
151 ReadLock(pthread_rwlock_t *lock) : d_lock(lock)
156 if((errno=pthread_rwlock_rdlock(d_lock)))
157 throw PDNSException("error acquiring rwlock tryrwlock: "+stringerror());
164 pthread_rwlock_unlock(d_lock);
172 pthread_rwlock_unlock(d_lock);
173 pthread_rwlock_wrlock(d_lock);