1 files changed, 106 insertions, 0 deletions
diff --git a/src/system_wrappers/source/rw_lock_generic.cc b/src/system_wrappers/source/rw_lock_generic.cc
new file mode 100644
index 0000000000..a468ef3b16
--- /dev/null
+++ b/src/system_wrappers/source/rw_lock_generic.cc
@@ -0,0 +1,106 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rw_lock_generic.h"
+
+#include "condition_variable_wrapper.h"
+#include "critical_section_wrapper.h"
+
+namespace webrtc {
+RWLockWrapperGeneric::RWLockWrapperGeneric()
+    : _readersActive(0),
+      _writerActive(false),
+      _readersWaiting(0),
+      _writersWaiting(0)
+{
+    _critSectPtr  = CriticalSectionWrapper::CreateCriticalSection();
+    _readCondPtr  = ConditionVariableWrapper::CreateConditionVariable();
+    _writeCondPtr = ConditionVariableWrapper::CreateConditionVariable();
+}
+
+RWLockWrapperGeneric::~RWLockWrapperGeneric()
+{
+    delete _writeCondPtr;
+    delete _readCondPtr;
+    delete _critSectPtr;
+}
+
+int RWLockWrapperGeneric::Init()
+{
+    return 0;
+}
+
+void RWLockWrapperGeneric::AcquireLockExclusive()
+{
+    _critSectPtr->Enter();
+
+    if (_writerActive || _readersActive > 0)
+    {
+        ++_writersWaiting;
+
+        while (_writerActive || _readersActive > 0)
+        {
+            _writeCondPtr->SleepCS(*_critSectPtr);
+        }
+
+        --_writersWaiting;
+    }
+    _writerActive = true;
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::ReleaseLockExclusive()
+{
+    _critSectPtr->Enter();
+
+    _writerActive = false;
+
+    if (_writersWaiting > 0)
+    {
+        _writeCondPtr->Wake();
+
+    }else if (_readersWaiting > 0)
+    {
+        _readCondPtr->WakeAll();
+    }
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::AcquireLockShared()
+{
+    _critSectPtr->Enter();
+
+    if (_writerActive || _writersWaiting > 0)
+    {
+        ++_readersWaiting;
+
+        while (_writerActive || _writersWaiting > 0)
+        {
+            _readCondPtr->SleepCS(*_critSectPtr);
+        }
+        --_readersWaiting;
+    }
+    ++_readersActive;
+    _critSectPtr->Leave();
+}
+
+void RWLockWrapperGeneric::ReleaseLockShared()
+{
+    _critSectPtr->Enter();
+
+    --_readersActive;
+
+    if (_readersActive == 0 && _writersWaiting > 0)
+    {
+        _writeCondPtr->Wake();
+    }
+    _critSectPtr->Leave();
+}
+} // namespace webrtc