Imported Upstream version 3.2.2

[debian/gnuradio] / mblock / src / lib / mb_msg_queue.cc

diff --git a/mblock/src/lib/mb_msg_queue.cc b/mblock/src/lib/mb_msg_queue.cc
new file mode 100644 (file)
index 0000000..c68c5fd
--- /dev/null
+++ b/mblock/src/lib/mb_msg_queue.cc
@@ -0,0 +1,128 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <mblock/msg_queue.h>
+#include <mblock/message.h>
+
+
+mb_msg_queue::mb_msg_queue()
+  : d_not_empty(&d_mutex)
+{
+}
+
+mb_msg_queue::~mb_msg_queue()
+{
+}
+
+void
+mb_msg_queue::insert(mb_message_sptr msg)
+{
+  omni_mutex_lock      l(d_mutex);
+  
+  mb_pri_t q = mb_pri_clamp(msg->priority());
+
+  if (d_queue[q].empty_p()){
+    d_queue[q].tail = d_queue[q].head = msg;
+    msg->d_next.reset();       //msg->d_next = 0;
+  }
+  else {
+    d_queue[q].tail->d_next = msg;
+    d_queue[q].tail = msg;
+    msg->d_next.reset();       // msg->d_next = 0;
+  }
+
+  // FIXME set bit in bitmap
+
+  d_not_empty.signal();
+}
+
+/*
+ * Delete highest pri message from the queue and return it.
+ * Returns equivalent of zero pointer if queue is empty.
+ *
+ * Caller must be holding d_mutex
+ */
+mb_message_sptr
+mb_msg_queue::get_highest_pri_msg_helper()
+{
+  // FIXME use bitmap and ffz to find best queue in O(1)
+
+  for (mb_pri_t q = 0; q <= MB_PRI_WORST; q++){
+
+    if (!d_queue[q].empty_p()){
+      mb_message_sptr msg = d_queue[q].head;
+      d_queue[q].head = msg->d_next;
+      if (d_queue[q].head == 0){
+       d_queue[q].tail.reset();        // d_queue[q].tail = 0;
+       // FIXME clear bit in bitmap
+      }
+
+      msg->d_next.reset();             // msg->d_next = 0;
+      return msg;
+    }
+  }
+
+  return mb_message_sptr();            // eqv to a zero pointer
+}
+
+
+mb_message_sptr
+mb_msg_queue::get_highest_pri_msg_nowait()
+{
+  omni_mutex_lock      l(d_mutex);
+
+  return get_highest_pri_msg_helper();
+}
+
+mb_message_sptr
+mb_msg_queue::get_highest_pri_msg()
+{
+  omni_mutex_lock l(d_mutex);
+
+  while (1){
+    mb_message_sptr msg = get_highest_pri_msg_helper();
+    if (msg)                   // Got one; return it
+      return msg;
+
+    d_not_empty.wait();                // Wait for something
+  }
+}
+
+mb_message_sptr
+mb_msg_queue::get_highest_pri_msg_timedwait(const mb_time &abs_time)
+{
+  unsigned long secs  = abs_time.d_secs;
+  unsigned long nsecs = abs_time.d_nsecs;
+
+  omni_mutex_lock l(d_mutex);
+
+  while (1){
+    mb_message_sptr msg = get_highest_pri_msg_helper();
+    if (msg)                   // Got one; return it
+      return msg;
+
+    if (!d_not_empty.timedwait(secs, nsecs))   // timed out
+      return mb_message_sptr();                        // eqv to zero pointer
+  }
+}