1 files changed, 34 insertions, 0 deletions
diff --git a/slog/counter.py b/slog/counter.py
new file mode 100644
index 0000000..4760fe8
--- /dev/null
+++ b/slog/counter.py
@@ -0,0 +1,34 @@
+# Copyright 2015, 2016 Suomen Tilaajavastuu Oy
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import _thread
+
+
+class Counter:
+
+    '''A threadsafe incrementing counter.'''
+
+    def __init__(self):
+        self._lock = _thread.allocate_lock()
+        self._counter = 0
+
+    def get(self):
+        return self._counter
+
+    def increment(self):
+        with self._lock:
+            self._counter += 1
+            return self._counter