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-rw-r--r--digital/io-hub/src/common-cc/fsm_queue.cc50
-rw-r--r--digital/io-hub/src/common-cc/fsm_queue.hh62
2 files changed, 112 insertions, 0 deletions
diff --git a/digital/io-hub/src/common-cc/fsm_queue.cc b/digital/io-hub/src/common-cc/fsm_queue.cc
new file mode 100644
index 00000000..816d836d
--- /dev/null
+++ b/digital/io-hub/src/common-cc/fsm_queue.cc
@@ -0,0 +1,50 @@
+// io-hub - Modular Input/Output. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program 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 2 of the License, or
+// (at your option) any later version.
+//
+// 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 "fsm_queue.hh"
+
+FsmQueue::FsmQueue ()
+ : head_ (0), nb_ (0)
+{
+}
+
+void
+FsmQueue::post (Event e)
+{
+ ucoo::assert (nb_ < queue_size_);
+ int tail = (head_ + nb_) % queue_size_;
+ events_[tail] = e;
+ nb_++;
+}
+
+FsmQueue::Event
+FsmQueue::pop ()
+{
+ Event e;
+ ucoo::assert (nb_ > 0);
+ e = events_[head_];
+ nb_--;
+ head_ = (head_ + 1) % queue_size_;
+ return e;
+}
+
diff --git a/digital/io-hub/src/common-cc/fsm_queue.hh b/digital/io-hub/src/common-cc/fsm_queue.hh
new file mode 100644
index 00000000..333bea80
--- /dev/null
+++ b/digital/io-hub/src/common-cc/fsm_queue.hh
@@ -0,0 +1,62 @@
+#ifndef fsm_queue_hh
+#define fsm_queue_hh
+// io-hub - Modular Input/Output. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program 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 2 of the License, or
+// (at your option) any later version.
+//
+// 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 "ucoolib/common.hh"
+
+extern "C" {
+#define ANGFSM_NAME AI
+#include "angfsm.h"
+}
+
+/// Handle asynchronous FSM event queue.
+class FsmQueue
+{
+ public:
+#ifdef TARGET_host
+ typedef uint16_t Event;
+#else
+ typedef angfsm_AI_event_t Event;
+#endif
+ public:
+ /// Constructor.
+ FsmQueue ();
+ /// Post an event to be processed in the next main loop.
+ void post (Event e);
+ /// Poll for event (return true if there is an event pending).
+ bool poll () const { return nb_ != 0; }
+ /// Pop one event from the queue.
+ Event pop ();
+ private:
+ /// Maximum number of events in the queue.
+ static const int queue_size_ = 8;
+ /// Events to post to the FSM in next iteration.
+ Event events_[queue_size_];
+ /// First event in the queue.
+ int head_;
+ /// Number of events in the queue.
+ int nb_;
+};
+
+#endif // fsm_queue_hh