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+/*
+ * anytun
+ *
+ * The secure anycast tunneling protocol (satp) defines a protocol used
+ * for communication between any combination of unicast and anycast
+ * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
+ * mode and allows tunneling of every ETHER TYPE protocol (e.g.
+ * ethernet, ip, arp ...). satp directly includes cryptography and
+ * message authentication based on the methodes used by SRTP. It is
+ * intended to deliver a generic, scaleable and secure solution for
+ * tunneling and relaying of packets of any protocol.
+ *
+ *
+ * Copyright (C) 2007 anytun.org <satp@wirdorange.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _THREADUTILS_HPP_
+#define _THREADUTILS_HPP_
+
+#include <stdexcept>
+#include <semaphore.h>
+
+class Mutex
+{
+public:
+ Mutex()
+ {
+ if(pthread_mutex_init(&mutex,NULL))
+ throw std::runtime_error("can't create mutex");
+ }
+
+ ~Mutex()
+ {
+ pthread_mutex_destroy(&mutex);
+ }
+
+private:
+ Mutex(const Mutex& src);
+ void operator=(const Mutex& src);
+
+ void lock()
+ {
+ if(pthread_mutex_lock(&mutex))
+ throw std::runtime_error("can't lock mutex");
+ }
+
+ void unlock()
+ {
+ if(pthread_mutex_unlock(&mutex))
+ throw std::runtime_error("can't unlock mutex");
+ }
+ friend class Lock;
+ friend class Condition;
+ pthread_mutex_t mutex;
+};
+
+
+class Lock
+{
+public:
+ Lock(Mutex &m) : mutex(m)
+ {
+ mutex.lock();
+ }
+
+ ~Lock()
+ {
+ mutex.unlock();
+ }
+
+private:
+ Lock(const Lock& src);
+ void operator=(const Lock& src);
+
+ Mutex &mutex;
+};
+
+class Condition
+{
+public:
+ Condition()
+ {
+ if(pthread_cond_init(&cond, NULL))
+ throw std::runtime_error("can't create condition");
+ }
+
+ ~Condition()
+ {
+ pthread_cond_destroy(&cond);
+ }
+
+ void wait()
+ {
+ mutex.lock();
+ if(pthread_cond_wait(&cond, &mutex.mutex))
+ {
+ mutex.unlock();
+ throw std::runtime_error("error on waiting for condition");
+ }
+ mutex.unlock();
+ }
+
+ void signal()
+ {
+ mutex.lock();
+ if(pthread_cond_signal(&cond))
+ {
+ mutex.unlock();
+ throw std::runtime_error("can't signal condition");
+ }
+ mutex.unlock();
+ }
+
+ void broadcast()
+ {
+ mutex.lock();
+ if(pthread_cond_broadcast(&cond))
+ {
+ mutex.unlock();
+ throw std::runtime_error("can't broadcast condition");
+ }
+ mutex.unlock();
+ }
+
+private:
+ pthread_cond_t cond;
+ Mutex mutex;
+};
+
+class Semaphore
+{
+public:
+ Semaphore(unsigned int initVal=0)
+ {
+ if(sem_init(&sem, 0, initVal))
+ throw std::runtime_error("can't create semaphore");
+ }
+
+ ~Semaphore()
+ {
+ sem_destroy(&sem);
+ }
+
+ void down()
+ {
+ if(sem_wait(&sem))
+ throw std::runtime_error("error on semaphore down");
+ }
+
+ void up()
+ {
+ if(sem_post(&sem))
+ throw std::runtime_error("error on semaphore up");
+ }
+
+private:
+ sem_t sem;
+};
+
+#endif