--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/core/unix-system-condition.cc	Tue Jul 15 15:59:57 2008 -0700
@@ -0,0 +1,212 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2008 University of Washington
+ *
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <pthread.h>
+#include <errno.h>
+#include <sys/time.h>
+#include "fatal-error.h"
+#include "system-condition.h"
+#include "log.h"
+
+NS_LOG_COMPONENT_DEFINE ("SystemCondition");
+
+namespace ns3 {
+
+class SystemConditionPrivate {    
+public: 
+  static const uint64_t NS_PER_SEC = (uint64_t)1000000000;
+
+  SystemConditionPrivate ();
+  ~SystemConditionPrivate ();
+	
+  void SetCondition (bool condition);
+  bool GetCondition (void);
+  void Signal (void);
+  void Broadcast (void);
+  void Wait (void);
+  bool TimedWait (uint64_t ns);
+
+private:
+  pthread_mutex_t m_mutex;
+  pthread_cond_t  m_cond;
+  bool m_condition;
+};
+
+SystemConditionPrivate::SystemConditionPrivate ()
+{
+  NS_LOG_FUNCTION_NOARGS ();
+
+  m_condition = false;
+
+  pthread_mutexattr_t mAttr;
+  pthread_mutexattr_init (&mAttr);
+  pthread_mutexattr_settype (&mAttr, PTHREAD_MUTEX_ERRORCHECK_NP);
+  pthread_mutex_init (&m_mutex, &mAttr);
+
+  pthread_condattr_t cAttr;
+  pthread_condattr_init (&cAttr);
+  pthread_condattr_setpshared (&cAttr, PTHREAD_PROCESS_PRIVATE);
+  pthread_cond_init (&m_cond, &cAttr);
+}
+    
+SystemConditionPrivate::~SystemConditionPrivate() 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  pthread_mutex_destroy (&m_mutex);
+  pthread_cond_destroy (&m_cond);
+}
+	
+  void 
+SystemConditionPrivate::SetCondition (bool condition)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  m_condition = condition;
+}
+	
+  bool
+SystemConditionPrivate::GetCondition (void)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  return m_condition;
+}
+	
+  void 
+SystemConditionPrivate::Signal (void)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+
+  pthread_mutex_lock (&m_mutex);
+  pthread_cond_signal (&m_cond);
+  pthread_mutex_unlock (&m_mutex);
+}
+	
+  void 
+SystemConditionPrivate::Broadcast (void)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+
+  pthread_mutex_lock (&m_mutex);
+  pthread_cond_broadcast (&m_cond);
+  pthread_mutex_unlock (&m_mutex);
+}
+
+  void 
+SystemConditionPrivate::Wait (void)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+
+  pthread_mutex_lock (&m_mutex);
+  m_condition = false;
+  while (m_condition == false)
+    {
+      pthread_cond_wait (&m_cond, &m_mutex);
+    }
+  pthread_mutex_unlock (&m_mutex);
+}
+
+  bool
+SystemConditionPrivate::TimedWait (uint64_t ns)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+
+  struct timespec ts;
+  ts.tv_sec = ns / NS_PER_SEC;
+  ts.tv_nsec = ns % NS_PER_SEC;
+
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+
+  ts.tv_sec += tv.tv_sec;
+  ts.tv_nsec += tv.tv_usec * 1000;
+  if (ts.tv_nsec > (int64_t)NS_PER_SEC)
+    {
+      ++ts.tv_sec;
+      ts.tv_nsec %= NS_PER_SEC;
+    }
+
+  int rc;
+
+  pthread_mutex_lock (&m_mutex);
+  while (m_condition == false)
+    {
+      rc = pthread_cond_timedwait (&m_cond, &m_mutex, &ts);
+      if (rc == ETIMEDOUT)
+        {
+          pthread_mutex_unlock (&m_mutex); 
+         return true;
+        }
+    }
+  pthread_mutex_unlock (&m_mutex);
+  return false;
+}
+	
+SystemCondition::SystemCondition() 
+  : m_priv (new SystemConditionPrivate ())
+{
+  NS_LOG_FUNCTION_NOARGS ();
+}
+
+SystemCondition::~SystemCondition () 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  delete m_priv;
+}
+
+  void 
+SystemCondition::SetCondition (bool condition) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  m_priv->SetCondition (condition);
+}
+
+  bool
+SystemCondition::GetCondition (void) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  return m_priv->GetCondition ();
+}
+
+  void 
+SystemCondition::Signal (void) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  m_priv->Signal ();
+}
+
+  void 
+SystemCondition::Broadcast (void) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  m_priv->Broadcast ();
+}  
+
+  void 
+SystemCondition::Wait (void) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  m_priv->Wait ();
+}  
+
+  bool
+SystemCondition::TimedWait (uint64_t ns) 
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  return m_priv->TimedWait (ns);
+}  
+
+} // namespace ns3