1 files changed, 81 insertions, 0 deletions
diff --git a/src/mongo/util/concurrency/synchronization.cpp b/src/mongo/util/concurrency/synchronization.cpp
new file mode 100644
index 00000000000..4186745dc16
--- /dev/null
+++ b/src/mongo/util/concurrency/synchronization.cpp
@@ -0,0 +1,81 @@
+// synchronization.cpp
+
+/*    Copyright 2010 10gen Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#include "pch.h"
+#include "synchronization.h"
+
+namespace mongo {
+
+    Notification::Notification() : _mutex ( "Notification" ){ 
+        lookFor = 1;
+        cur = 0;
+    }
+
+    Notification::~Notification() { }
+
+    void Notification::waitToBeNotified() {
+        scoped_lock lock( _mutex );
+        while ( lookFor != cur )
+            _condition.wait( lock.boost() );
+        lookFor++;
+    }
+
+    void Notification::notifyOne() {
+        scoped_lock lock( _mutex );
+        assert( cur != lookFor );
+        cur++;
+        _condition.notify_one();
+    }
+
+    /* --- NotifyAll --- */
+
+    NotifyAll::NotifyAll() : _mutex("NotifyAll") { 
+        _lastDone = 0;
+        _lastReturned = 0;
+        _nWaiting = 0;
+    }
+
+    NotifyAll::When NotifyAll::now() { 
+        scoped_lock lock( _mutex );
+        return ++_lastReturned;
+    }
+
+    void NotifyAll::waitFor(When e) {
+        scoped_lock lock( _mutex );
+        ++_nWaiting;
+        while( _lastDone < e ) {
+            _condition.wait( lock.boost() );
+        }
+    }
+
+    void NotifyAll::awaitBeyondNow() { 
+        scoped_lock lock( _mutex );
+        ++_nWaiting;
+        When e = ++_lastReturned;
+        while( _lastDone <= e ) {
+            _condition.wait( lock.boost() );
+        }
+    }
+
+    void NotifyAll::notifyAll(When e) {
+        scoped_lock lock( _mutex );
+        _lastDone = e;
+        _nWaiting = 0;
+        _condition.notify_all();
+    }
+
+} // namespace mongo