1 files changed, 41 insertions, 0 deletions
diff --git a/brep/shared-database.cxx b/brep/shared-database.cxx
new file mode 100644
index 0000000..fb952d8
--- /dev/null
+++ b/brep/shared-database.cxx
@@ -0,0 +1,41 @@
+// file      : brep/shared-database.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <brep/shared-database>
+
+#include <memory>    // weak_ptr, shared_ptr, make_shared()
+#include <stdexcept> // runtime_error
+
+#include <odb/pgsql/database.hxx>
+
+using namespace std;
+using namespace odb;
+
+namespace brep
+{
+  shared_ptr<database>
+  shared_database (const string& host, unsigned int port)
+  {
+    static weak_ptr<pgsql::database> db;
+
+    // In C++11, function-static variable initialization is
+    // guaranteed to be thread-safe, thought this doesn't
+    // seem to be enough in our case (because we are re-
+    // initializing the weak pointer).
+    //
+    if (shared_ptr<database> d = db.lock ())
+    {
+      if (h != d->host () || p != d->port ())
+        throw runtime_error ("shared database host/port mismatch");
+
+      return d;
+    }
+    else
+    {
+      d = make_shared<database> ("", "", "brep", h, p);
+      db = d;
+      return d;
+    }
+  }
+}