craigdo@3425: /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
craigdo@3425: /*
craigdo@3425:  * Copyright (c) 2008 University of Washington
craigdo@3425:  *
craigdo@3425:  * This program is free software; you can redistribute it and/or modify
craigdo@3425:  * it under the terms of the GNU General Public License version 2 as
craigdo@3425:  * published by the Free Software Foundation;
craigdo@3425:  *
craigdo@3425:  * This program is distributed in the hope that it will be useful,
craigdo@3425:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
craigdo@3425:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
craigdo@3425:  * GNU General Public License for more details.
craigdo@3425:  *
craigdo@3425:  * You should have received a copy of the GNU General Public License
craigdo@3425:  * along with this program; if not, write to the Free Software
craigdo@3425:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
craigdo@3425:  */
craigdo@3425: 
craigdo@3425: #include <pthread.h>
craigdo@3425: #include <errno.h>
craigdo@3425: #include <sys/time.h>
craigdo@3425: #include "fatal-error.h"
craigdo@3425: #include "system-condition.h"
craigdo@3425: #include "log.h"
craigdo@3425: 
craigdo@3425: NS_LOG_COMPONENT_DEFINE ("SystemCondition");
craigdo@3425: 
craigdo@3425: namespace ns3 {
craigdo@3425: 
craigdo@3425: class SystemConditionPrivate {    
craigdo@3425: public: 
craigdo@3425:   static const uint64_t NS_PER_SEC = (uint64_t)1000000000;
craigdo@3425: 
craigdo@3425:   SystemConditionPrivate ();
craigdo@3425:   ~SystemConditionPrivate ();
craigdo@3425: 	
craigdo@3425:   void SetCondition (bool condition);
craigdo@3425:   bool GetCondition (void);
craigdo@3425:   void Signal (void);
craigdo@3425:   void Broadcast (void);
craigdo@3425:   void Wait (void);
craigdo@3425:   bool TimedWait (uint64_t ns);
craigdo@3425: 
craigdo@3425: private:
craigdo@3425:   pthread_mutex_t m_mutex;
craigdo@3425:   pthread_cond_t  m_cond;
craigdo@3425:   bool m_condition;
craigdo@3425: };
craigdo@3425: 
craigdo@3425: SystemConditionPrivate::SystemConditionPrivate ()
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: 
craigdo@3425:   m_condition = false;
craigdo@3425: 
craigdo@3425:   pthread_mutexattr_t mAttr;
craigdo@3425:   pthread_mutexattr_init (&mAttr);
craigdo@3434: //
craigdo@3434: // Linux and OS X (at least) have, of course chosen different names for the 
craigdo@3434: // error checking flags just to make life difficult.
craigdo@3434: //
craigdo@3434: #if defined (PTHREAD_MUTEX_ERRORCHECK_NP)
craigdo@3425:   pthread_mutexattr_settype (&mAttr, PTHREAD_MUTEX_ERRORCHECK_NP);
craigdo@3434: #else
craigdo@3434:   pthread_mutexattr_settype (&mAttr, PTHREAD_MUTEX_ERRORCHECK);
craigdo@3434: #endif
craigdo@3425:   pthread_mutex_init (&m_mutex, &mAttr);
craigdo@3425: 
craigdo@3425:   pthread_condattr_t cAttr;
craigdo@3425:   pthread_condattr_init (&cAttr);
craigdo@3425:   pthread_condattr_setpshared (&cAttr, PTHREAD_PROCESS_PRIVATE);
craigdo@3425:   pthread_cond_init (&m_cond, &cAttr);
craigdo@3425: }
craigdo@3425:     
craigdo@3425: SystemConditionPrivate::~SystemConditionPrivate() 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   pthread_mutex_destroy (&m_mutex);
craigdo@3425:   pthread_cond_destroy (&m_cond);
craigdo@3425: }
craigdo@3425: 	
craigdo@3425:   void 
craigdo@3425: SystemConditionPrivate::SetCondition (bool condition)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   m_condition = condition;
craigdo@3425: }
craigdo@3425: 	
craigdo@3425:   bool
craigdo@3425: SystemConditionPrivate::GetCondition (void)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   return m_condition;
craigdo@3425: }
craigdo@3425: 	
craigdo@3425:   void 
craigdo@3425: SystemConditionPrivate::Signal (void)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: 
craigdo@3425:   pthread_mutex_lock (&m_mutex);
craigdo@3425:   pthread_cond_signal (&m_cond);
craigdo@3425:   pthread_mutex_unlock (&m_mutex);
craigdo@3425: }
craigdo@3425: 	
craigdo@3425:   void 
craigdo@3425: SystemConditionPrivate::Broadcast (void)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: 
craigdo@3425:   pthread_mutex_lock (&m_mutex);
craigdo@3425:   pthread_cond_broadcast (&m_cond);
craigdo@3425:   pthread_mutex_unlock (&m_mutex);
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   void 
craigdo@3425: SystemConditionPrivate::Wait (void)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: 
craigdo@3425:   pthread_mutex_lock (&m_mutex);
craigdo@3425:   m_condition = false;
craigdo@3425:   while (m_condition == false)
craigdo@3425:     {
craigdo@3425:       pthread_cond_wait (&m_cond, &m_mutex);
craigdo@3425:     }
craigdo@3425:   pthread_mutex_unlock (&m_mutex);
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   bool
craigdo@3425: SystemConditionPrivate::TimedWait (uint64_t ns)
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: 
craigdo@3425:   struct timespec ts;
craigdo@3425:   ts.tv_sec = ns / NS_PER_SEC;
craigdo@3425:   ts.tv_nsec = ns % NS_PER_SEC;
craigdo@3425: 
craigdo@3425:   struct timeval tv;
craigdo@3425:   gettimeofday(&tv, NULL);
craigdo@3425: 
craigdo@3425:   ts.tv_sec += tv.tv_sec;
craigdo@3425:   ts.tv_nsec += tv.tv_usec * 1000;
craigdo@3425:   if (ts.tv_nsec > (int64_t)NS_PER_SEC)
craigdo@3425:     {
craigdo@3425:       ++ts.tv_sec;
craigdo@3425:       ts.tv_nsec %= NS_PER_SEC;
craigdo@3425:     }
craigdo@3425: 
craigdo@3425:   int rc;
craigdo@3425: 
craigdo@3425:   pthread_mutex_lock (&m_mutex);
craigdo@3425:   while (m_condition == false)
craigdo@3425:     {
craigdo@3425:       rc = pthread_cond_timedwait (&m_cond, &m_mutex, &ts);
craigdo@3425:       if (rc == ETIMEDOUT)
craigdo@3425:         {
craigdo@3425:           pthread_mutex_unlock (&m_mutex); 
craigdo@3425:          return true;
craigdo@3425:         }
craigdo@3425:     }
craigdo@3425:   pthread_mutex_unlock (&m_mutex);
craigdo@3425:   return false;
craigdo@3425: }
craigdo@3425: 	
craigdo@3425: SystemCondition::SystemCondition() 
craigdo@3425:   : m_priv (new SystemConditionPrivate ())
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425: }
craigdo@3425: 
craigdo@3425: SystemCondition::~SystemCondition () 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   delete m_priv;
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   void 
craigdo@3425: SystemCondition::SetCondition (bool condition) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   m_priv->SetCondition (condition);
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   bool
craigdo@3425: SystemCondition::GetCondition (void) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   return m_priv->GetCondition ();
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   void 
craigdo@3425: SystemCondition::Signal (void) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   m_priv->Signal ();
craigdo@3425: }
craigdo@3425: 
craigdo@3425:   void 
craigdo@3425: SystemCondition::Broadcast (void) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   m_priv->Broadcast ();
craigdo@3425: }  
craigdo@3425: 
craigdo@3425:   void 
craigdo@3425: SystemCondition::Wait (void) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   m_priv->Wait ();
craigdo@3425: }  
craigdo@3425: 
craigdo@3425:   bool
craigdo@3425: SystemCondition::TimedWait (uint64_t ns) 
craigdo@3425: {
craigdo@3425:   NS_LOG_FUNCTION_NOARGS ();
craigdo@3425:   return m_priv->TimedWait (ns);
craigdo@3425: }  
craigdo@3425: 
craigdo@3425: } // namespace ns3