1 files changed, 56 insertions, 0 deletions
diff --git a/src/ypollset.cpp b/src/ypollset.cpp
new file mode 100644
index 0000000..0be6791
--- /dev/null
+++ b/src/ypollset.cpp
@@ -0,0 +1,56 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ypollset.hpp"
+
+zs::ypollset_t::ypollset_t ()
+{
+}
+
+void zs::ypollset_t::signal (int signal_)
+{
+    zs_assert (signal_ >= 0 && signal_ < wait_signal);
+    if (bits.btsr (signal_, wait_signal))
+        sem.post (); 
+}
+
+zs::ypollset_t::signals_t zs::ypollset_t::poll ()
+{
+    signals_t result = 0;
+    while (!result) {
+        result = bits.izte (signals_t (1) << wait_signal, 0);
+        if (!result) {
+            sem.wait ();
+            result = bits.xchg (0);
+        }
+
+        //  If btsr was really atomic, result would never be 0 at this
+        //  point, i.e. no looping would be possible. However, to
+        //  support even CPU architectures without CAS instruction
+        //  we allow btsr to be composed of two independent atomic
+        //  operation (set and reset). In such case looping can occur
+        //  sporadically.
+    }
+    return result;      
+}
+
+zs::ypollset_t::signals_t zs::ypollset_t::check ()
+{
+    return bits.xchg (0);
+}