Rename RWLockGeneric to RWLockWinXP to more accurately reflect when it's used.

webrtc/system_wrappers/source/rw_lock_winxp_win.cc

+/*
+ *  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 "webrtc/system_wrappers/source/rw_lock_winxp_win.h"
+
+namespace webrtc {
+
+RWLockWinXP::RWLockWinXP() {}
+RWLockWinXP::~RWLockWinXP() {}
+
+void RWLockWinXP::AcquireLockExclusive() {
+  CriticalSectionScoped cs(&critical_section_);
+  if (writer_active_ || readers_active_ > 0) {
+    ++writers_waiting_;
+    while (writer_active_ || readers_active_ > 0) {
+      write_condition_.SleepCS(critical_section_);
+    }
+    --writers_waiting_;
+  }
+  writer_active_ = true;
+}
+
+void RWLockWinXP::ReleaseLockExclusive() {
+  CriticalSectionScoped cs(&critical_section_);
+  writer_active_ = false;
+  if (writers_waiting_ > 0) {
+    write_condition_.Wake();
+  } else if (readers_waiting_ > 0) {
+    read_condition_.WakeAll();
+  }
+}
+
+void RWLockWinXP::AcquireLockShared() {
+  CriticalSectionScoped cs(&critical_section_);
+  if (writer_active_ || writers_waiting_ > 0) {
+    ++readers_waiting_;
+
+    while (writer_active_ || writers_waiting_ > 0) {
+      read_condition_.SleepCS(critical_section_);
+    }
+    --readers_waiting_;
+  }
+  ++readers_active_;
+}
+
+void RWLockWinXP::ReleaseLockShared() {
+  CriticalSectionScoped cs(&critical_section_);
+  --readers_active_;
+  if (readers_active_ == 0 && writers_waiting_ > 0) {
+    write_condition_.Wake();
+  }
+}
+
+}  // namespace webrtc